downgrade to APK 29 & bump version

* rework node handling

* update block heights

.gitignore

@@ -14,3 +14,4 @@
 /app/prodMainnet
 /app/alphaStagenet
 /app/prodStagenet
+/app/.cxx

app/CMakeLists.txt

@@ -137,7 +137,11 @@ set_target_properties(checkpoints PROPERTIES IMPORTED_LOCATION
 
 add_library(device STATIC IMPORTED)
 set_target_properties(device PROPERTIES IMPORTED_LOCATION
-    ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/libdevice.a)
+        ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/libdevice.a)
+
+add_library(device_trezor STATIC IMPORTED)
+set_target_properties(device_trezor PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/libdevice_trezor.a)
 
 add_library(multisig STATIC IMPORTED)
 set_target_properties(multisig PROPERTIES IMPORTED_LOCATION
@@ -147,6 +151,22 @@ add_library(version STATIC IMPORTED)
 set_target_properties(version PROPERTIES IMPORTED_LOCATION
     ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/libversion.a)
 
+add_library(net STATIC IMPORTED)
+set_target_properties(net PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/libnet.a)
+
+add_library(hardforks STATIC IMPORTED)
+set_target_properties(hardforks PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/libhardforks.a)
+
+add_library(randomx STATIC IMPORTED)
+set_target_properties(randomx PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/librandomx.a)
+
+add_library(rpc_base STATIC IMPORTED)
+set_target_properties(rpc_base PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/monero/lib/${ANDROID_ABI}/librpc_base.a)
+
 #############
 # System
 #############
@@ -166,6 +186,7 @@ target_link_libraries(  monerujo
                         mnemonics
                         ringct
                         ringct_basic
+                        net
                         common
                         cncrypto
                         blockchain_db
@@ -176,8 +197,12 @@ target_link_libraries(  monerujo
                         blocks
                         checkpoints
                         device
+                        device_trezor
                         multisig
                         version
+                        randomx
+                        hardforks
+                        rpc_base
 
                         boost_chrono
                         boost_date_time

app/build.gradle

@@ -1,16 +1,15 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 28
-    buildToolsVersion '28.0.3'
+    compileSdkVersion 29
+    buildToolsVersion '29.0.2'
     defaultConfig {
         applicationId "com.m2049r.xmrwallet"
         minSdkVersion 21
-        targetSdkVersion 28
-        versionCode 173
-        versionName "1.11.3 'Chernushka'"
-
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        targetSdkVersion 29
+        versionCode 602
+        versionName "1.16.2 'Karmic Nodes'"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {
                 cppFlags "-std=c++11"
@@ -18,6 +17,11 @@ android {
             }
         }
     }
+    bundle {
+        language {
+            enableSplit = false
+        }
+    }
 
     flavorDimensions 'type', 'net'
     productFlavors {
@@ -29,6 +33,11 @@ android {
             applicationIdSuffix '.stage'
             versionNameSuffix ' (stage)'
         }
+        devnet {
+            dimension 'net'
+            applicationIdSuffix '.test'
+            versionNameSuffix ' (test)'
+        }
         alpha {
             dimension 'type'
             applicationIdSuffix '.alpha'
@@ -71,7 +80,8 @@ android {
     def availableLocales = ["en"]
     new File("app/src/main/res/").eachFileMatch(~/^values-.*/) { file ->
         def languageTag = file.name.substring(7).replace("-r", "-")
-        availableLocales.add(languageTag)
+        if (languageTag != "night")
+            availableLocales.add(languageTag)
     }
 
     // APKs for the same app that all have the same version information.
@@ -82,8 +92,7 @@ android {
         variant.outputs.all {
             output ->
                 def abiName = output.getFilter(com.android.build.OutputFile.ABI)
-                output.versionCodeOverride = abiCodes.get(abiName, 0) + 10 * variant.versionCode
-                //def flavor = output.getFilter(flavor)
+                output.versionCodeOverride = abiCodes.get(abiName, 0) + 10 * versionCode
 
                 if (abiName == null) abiName = "universal"
                 def v = "${variant.versionName}".replaceFirst(" '.*' ?", "")
@@ -93,36 +102,43 @@ android {
                 outputFileName = "$rootProject.ext.apkName-" + v + "_" + abiName + ".apk"
         }
     }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 dependencies {
-    implementation "com.android.support:appcompat-v7:$rootProject.ext.supportVersion"
-    implementation "com.android.support:design:$rootProject.ext.supportVersion"
-    implementation "com.android.support:support-v4:$rootProject.ext.supportVersion"
-    implementation "com.android.support:recyclerview-v7:$rootProject.ext.supportVersion"
-    implementation "com.android.support:cardview-v7:$rootProject.ext.supportVersion"
-    implementation "com.android.support:swiperefreshlayout:$rootProject.ext.supportVersion"
+    implementation 'androidx.core:core:1.3.2'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.3.0-alpha03'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.2.0-alpha01'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+
     implementation 'me.dm7.barcodescanner:zxing:1.9.8'
+    implementation "com.squareup.okhttp3:okhttp:4.9.0"
+    implementation "com.burgstaller:okhttp-digest:2.1"
+    implementation "com.jakewharton.timber:timber:4.7.1"
 
-    implementation "com.squareup.okhttp3:okhttp:$rootProject.ext.okHttpVersion"
-    implementation "com.burgstaller:okhttp-digest:1.18"
-    implementation "com.jakewharton.timber:timber:$rootProject.ext.timberVersion"
+    implementation 'com.nulab-inc:zxcvbn:1.3.0'
 
-    implementation 'com.nulab-inc:zxcvbn:1.2.3'
-
-    implementation 'dnsjava:dnsjava:2.1.8'
-    implementation 'org.jitsi:dnssecjava:1.1.3'
-    implementation 'org.slf4j:slf4j-nop:1.7.25'
+    implementation 'dnsjava:dnsjava:2.1.9'
+    implementation 'org.jitsi:dnssecjava:1.2.0'
+    implementation 'org.slf4j:slf4j-nop:1.7.30'
     implementation 'com.github.brnunes:swipeablerecyclerview:1.0.2'
 
-    // https://mvnrepository.com/artifact/com.github.aelstad/keccakj
     implementation 'com.github.aelstad:keccakj:1.1.0'
 
-
     testImplementation "junit:junit:$rootProject.ext.junitVersion"
     testImplementation "org.mockito:mockito-all:$rootProject.ext.mockitoVersion"
-    testImplementation "com.squareup.okhttp3:mockwebserver:$rootProject.ext.okHttpVersion"
+    testImplementation "com.squareup.okhttp3:mockwebserver:4.9.0"
     testImplementation 'org.json:json:20180813'
     testImplementation 'net.jodah:concurrentunit:0.4.4'
 
+    compileOnly 'org.projectlombok:lombok:1.18.16'
+    annotationProcessor 'org.projectlombok:lombok:1.18.16'
 }

app/src/main/AndroidManifest.xml

@@ -13,6 +13,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
 
     <application
+        android:requestLegacyExternalStorage="true"
         android:name=".XmrWalletApplication"
         android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
@@ -20,24 +21,28 @@
         android:supportsRtl="true"
         android:theme="@style/MyMaterialTheme"
         android:usesCleartextTraffic="true">
-
         <activity
-            android:name=".WalletActivity"
-            android:configChanges="orientation|keyboardHidden"
-            android:label="@string/wallet_activity_name"
-            android:launchMode="singleTask"
-            android:screenOrientation="behind" />
-
-        <activity
-            android:name=".LoginActivity"
-            android:configChanges="orientation|keyboardHidden"
-            android:label="@string/app_name"
+            android:name=".MainActivity"
+            android:configChanges="orientation|keyboardHidden|uiMode"
             android:launchMode="singleTop"
-            android:screenOrientation="locked">
+            android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+        </activity>
+        <activity
+            android:name=".WalletActivity"
+            android:configChanges="orientation|keyboardHidden|uiMode"
+            android:label="@string/wallet_activity_name"
+            android:launchMode="singleTask"
+            android:screenOrientation="behind"/>
+        <activity
+            android:name=".LoginActivity"
+            android:configChanges="orientation|keyboardHidden|uiMode"
+            android:label="@string/app_name"
+            android:launchMode="singleTop"
+            android:screenOrientation="locked">
             <intent-filter>
                 <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
             </intent-filter>
@@ -62,6 +67,11 @@
                 android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
                 android:resource="@xml/usb_device_filter" />
         </activity>
+        <activity
+            android:name=".onboarding.OnBoardingActivity"
+            android:configChanges="orientation|keyboardHidden|uiMode"
+            android:launchMode="singleTask"
+            android:screenOrientation="portrait" />
 
         <service
             android:name=".service.WalletService"
@@ -70,7 +80,7 @@
             android:label="Monero Wallet Service" />
 
         <provider
-            android:name="android.support.v4.content.FileProvider"
+            android:name="androidx.core.content.FileProvider"
             android:authorities="${applicationId}.fileprovider"
             android:exported="false"
             android:grantUriPermissions="true">
@@ -79,4 +89,4 @@
                 android:resource="@xml/filepaths" />
         </provider>
     </application>
-</manifest>
+</manifest>

app/src/main/cpp/device_io_monerujo.hpp

@@ -1,88 +0,0 @@
-// Copyright (c) 2017-2018, The Monero Project
-//
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without modification, are
-// permitted provided that the following conditions are met:
-//
-// 1. Redistributions of source code must retain the above copyright notice, this list of
-//    conditions and the following disclaimer.
-//
-// 2. Redistributions in binary form must reproduce the above copyright notice, this list
-//    of conditions and the following disclaimer in the documentation and/or other
-//    materials provided with the distribution.
-//
-// 3. Neither the name of the copyright holder nor the names of its contributors may be
-//    used to endorse or promote products derived from this software without specific
-//    prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
-// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
-// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
-// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-//
-
-#if defined(HAVE_MONERUJO)
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-/**
- * @brief LedgerFind - find Ledger Device and return it's name
- * @param buffer     - buffer for name of found device
- * @param len        - length of buffer
- * @return  0 - success
- *         -1 - no device connected / found
- *         -2 - JVM not found
- */
-int LedgerFind(char *buffer, size_t len);
-
-/**
- * @brief LedgerExchange - exchange data with Ledger Device
- * @param command        - buffer for data to send
- * @param cmd_len        - length of send to send
- * @param response       - buffer for received data
- * @param max_resp_len   - size of receive buffer
- *
- * @return length of received data in response or -1 if error
- */
-int  LedgerExchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len);
-
-#ifdef __cplusplus
-}
-#endif
-
-#include "device_io.hpp"
-
-#pragma once
-
-namespace hw {
-  namespace io {
-    class device_io_monerujo: device_io {
-    public:
-      device_io_monerujo() {};
-      ~device_io_monerujo() {};
-
-      void init() {};
-      void release() {};
-
-      void connect(void *params) {};
-      void disconnect() {};
-      bool connected() const {return true;}; // monerujo is always connected before it gets here
-
-      // returns number of bytes read or -1 on error
-      int  exchange(unsigned char *command, unsigned int cmd_len, unsigned char *response, unsigned int max_resp_len) {
-        return LedgerExchange(command, cmd_len, response, max_resp_len);
-      }
-    };
-  };
-};
-
-#endif //#if defined(HAVE_MONERUJO)

app/src/main/cpp/monerujo.h

@@ -54,6 +54,8 @@ extern "C"
 {
 #endif
 
+extern const char* const MONERO_VERSION; // the actual monero core version
+
 // from monero-core crypto/hash-ops.h - avoid #including monero code here
 enum {
     HASH_SIZE = 32,

app/src/main/java/com/btchip/comm/android/BTChipTransportAndroidHID.java

@@ -46,8 +46,12 @@ public class BTChipTransportAndroidHID implements BTChipTransport {
         HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
         for (UsbDevice device : deviceList.values()) {
             Timber.d("%04X:%04X %s, %s", device.getVendorId(), device.getProductId(), device.getManufacturerName(), device.getProductName());
-            if ((device.getVendorId() == VID) && (device.getProductId() == PID_HID)) {
-                return device;
+            if (device.getVendorId() == VID) {
+                final int deviceProductId = device.getProductId();
+                for (int pid : PID_HIDS) {
+                    if (deviceProductId == pid)
+                        return device;
+                }
             }
         }
         return null;
@@ -74,7 +78,7 @@ public class BTChipTransportAndroidHID implements BTChipTransport {
     }
 
     private static final int VID = 0x2C97;
-    private static final int PID_HID = 0x0001;
+    private static final int[] PID_HIDS = {0x0001, 0x0004};
 
     private UsbDeviceConnection connection;
     private UsbInterface dongleInterface;

app/src/main/java/com/m2049r/levin/scanner/Dispatcher.java

@@ -185,7 +185,6 @@ public class Dispatcher implements PeerRetriever.OnGetPeers {
 
     public void seedPeers(Collection<NodeInfo> seedNodes) {
         for (NodeInfo node : seedNodes) {
-            node.clear();
             if (node.isFavourite()) {
                 rpcNodes.add(node);
                 if (listener != null) listener.onGet(node);

app/src/main/java/com/m2049r/xmrwallet/BaseActivity.java

@@ -15,9 +15,9 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.PowerManager;
-import android.support.annotation.CallSuper;
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
+import androidx.annotation.CallSuper;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
 import android.widget.Toast;
 
 import com.m2049r.xmrwallet.data.BarcodeData;

app/src/main/java/com/m2049r/xmrwallet/GenerateFragment.java

@@ -17,13 +17,9 @@
 package com.m2049r.xmrwallet;
 
 import android.app.Activity;
-import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.design.widget.TextInputLayout;
-import android.support.v4.app.Fragment;
 import android.text.Editable;
 import android.text.Html;
 import android.text.InputType;
@@ -38,9 +34,15 @@ import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.widget.Button;
 import android.widget.LinearLayout;
-import android.widget.Switch;
 import android.widget.TextView;
 
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.switchmaterial.SwitchMaterial;
+import com.google.android.material.textfield.TextInputLayout;
 import com.m2049r.xmrwallet.model.Wallet;
 import com.m2049r.xmrwallet.model.WalletManager;
 import com.m2049r.xmrwallet.util.FingerprintHelper;
@@ -79,6 +81,23 @@ public class GenerateFragment extends Fragment {
 
     private String type = null;
 
+    private void clearErrorOnTextEntry(final TextInputLayout textInputLayout) {
+        textInputLayout.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable editable) {
+                textInputLayout.setError(null);
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+            }
+        });
+    }
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -110,6 +129,23 @@ public class GenerateFragment extends Fragment {
                 }
             }
         });
+        clearErrorOnTextEntry(etWalletName);
+
+        etWalletPassword.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable editable) {
+                checkPassword();
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+            }
+        });
+
         etWalletMnemonic.getEditText().setOnFocusChangeListener(new View.OnFocusChangeListener() {
             @Override
             public void onFocusChange(View v, boolean hasFocus) {
@@ -118,6 +154,8 @@ public class GenerateFragment extends Fragment {
                 }
             }
         });
+        clearErrorOnTextEntry(etWalletMnemonic);
+
         etWalletAddress.getEditText().setOnFocusChangeListener(new View.OnFocusChangeListener() {
             @Override
             public void onFocusChange(View v, boolean hasFocus) {
@@ -126,6 +164,8 @@ public class GenerateFragment extends Fragment {
                 }
             }
         });
+        clearErrorOnTextEntry(etWalletAddress);
+
         etWalletViewKey.getEditText().setOnFocusChangeListener(new View.OnFocusChangeListener() {
             @Override
             public void onFocusChange(View v, boolean hasFocus) {
@@ -134,6 +174,8 @@ public class GenerateFragment extends Fragment {
                 }
             }
         });
+        clearErrorOnTextEntry(etWalletViewKey);
+
         etWalletSpendKey.getEditText().setOnFocusChangeListener(new View.OnFocusChangeListener() {
             @Override
             public void onFocusChange(View v, boolean hasFocus) {
@@ -142,6 +184,7 @@ public class GenerateFragment extends Fragment {
                 }
             }
         });
+        clearErrorOnTextEntry(etWalletSpendKey);
 
         Helper.showKeyboard(getActivity());
 
@@ -161,13 +204,13 @@ public class GenerateFragment extends Fragment {
         if (FingerprintHelper.isDeviceSupported(getContext())) {
             llFingerprintAuth.setVisibility(View.VISIBLE);
 
-            final Switch swFingerprintAllowed = (Switch) llFingerprintAuth.getChildAt(0);
+            final SwitchMaterial swFingerprintAllowed = (SwitchMaterial) llFingerprintAuth.getChildAt(0);
             swFingerprintAllowed.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View view) {
                     if (!swFingerprintAllowed.isChecked()) return;
 
-                    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+                    MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity());
                     builder.setMessage(Html.fromHtml(getString(R.string.generate_fingerprint_warn)))
                             .setCancelable(false)
                             .setPositiveButton(getString(R.string.label_ok), null)
@@ -310,21 +353,6 @@ public class GenerateFragment extends Fragment {
             }
         });
 
-        etWalletPassword.getEditText().addTextChangedListener(new TextWatcher() {
-            @Override
-            public void afterTextChanged(Editable editable) {
-                checkPassword();
-            }
-
-            @Override
-            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
-            }
-
-            @Override
-            public void onTextChanged(CharSequence s, int start, int before, int count) {
-            }
-        });
-
         etWalletName.requestFocus();
         initZxcvbn();
 
@@ -412,7 +440,7 @@ public class GenerateFragment extends Fragment {
             height = RestoreHeight.getInstance().getHeight(parser.parse(restoreHeight));
         } catch (ParseException ex) {
         }
-        if (height <= 0)
+        if ((height <= 0) && (restoreHeight.length() == 8))
             try {
                 // is it a date without dashes?
                 SimpleDateFormat parser = new SimpleDateFormat("yyyyMMdd");
@@ -481,7 +509,7 @@ public class GenerateFragment extends Fragment {
 
         String name = etWalletName.getEditText().getText().toString();
         String password = etWalletPassword.getEditText().getText().toString();
-        boolean fingerprintAuthAllowed = ((Switch) llFingerprintAuth.getChildAt(0)).isChecked();
+        boolean fingerprintAuthAllowed = ((SwitchMaterial) llFingerprintAuth.getChildAt(0)).isChecked();
 
         // create the real wallet password
         String crazyPass = KeyStoreHelper.getCrazyPass(getActivity(), password);
@@ -620,7 +648,7 @@ public class GenerateFragment extends Fragment {
         if (ledgerDialog != null) return;
         final Activity activity = getActivity();
         View promptsView = getLayoutInflater().inflate(R.layout.prompt_ledger_seed, null);
-        android.app.AlertDialog.Builder alertDialogBuilder = new android.app.AlertDialog.Builder(activity);
+        MaterialAlertDialogBuilder alertDialogBuilder = new MaterialAlertDialogBuilder(activity);
         alertDialogBuilder.setView(promptsView);
 
         final TextInputLayout etSeed = promptsView.findViewById(R.id.etSeed);
@@ -682,8 +710,7 @@ public class GenerateFragment extends Fragment {
             }
         });
 
-        // set FLAG_SECURE to prevent screenshots in Release Mode
-        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+        if (Helper.preventScreenshot()) {
             ledgerDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
         }
 

app/src/main/java/com/m2049r/xmrwallet/GenerateReviewFragment.java

@@ -16,14 +16,10 @@
 
 package com.m2049r.xmrwallet;
 
-import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.design.widget.TextInputLayout;
-import android.support.v4.app.Fragment;
 import android.text.Editable;
 import android.text.Html;
 import android.text.TextWatcher;
@@ -40,10 +36,17 @@ import android.widget.ImageButton;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
 import android.widget.ScrollView;
-import android.widget.Switch;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.switchmaterial.SwitchMaterial;
+import com.google.android.material.textfield.TextInputLayout;
 import com.m2049r.xmrwallet.ledger.Ledger;
 import com.m2049r.xmrwallet.ledger.LedgerProgressDialog;
 import com.m2049r.xmrwallet.model.NetworkType;
@@ -55,6 +58,8 @@ import com.m2049r.xmrwallet.util.KeyStoreHelper;
 import com.m2049r.xmrwallet.util.MoneroThreadPoolExecutor;
 import com.m2049r.xmrwallet.widget.Toolbar;
 
+import java.text.NumberFormat;
+
 import timber.log.Timber;
 
 public class GenerateReviewFragment extends Fragment {
@@ -72,6 +77,7 @@ public class GenerateReviewFragment extends Fragment {
     private TextView tvWalletPassword;
     private TextView tvWalletAddress;
     private TextView tvWalletMnemonic;
+    private TextView tvWalletHeight;
     private TextView tvWalletViewKey;
     private TextView tvWalletSpendKey;
     private ImageButton bCopyAddress;
@@ -99,6 +105,7 @@ public class GenerateReviewFragment extends Fragment {
         tvWalletViewKey = view.findViewById(R.id.tvWalletViewKey);
         tvWalletSpendKey = view.findViewById(R.id.tvWalletSpendKey);
         tvWalletMnemonic = view.findViewById(R.id.tvWalletMnemonic);
+        tvWalletHeight = view.findViewById(R.id.tvWalletHeight);
         bCopyAddress = view.findViewById(R.id.bCopyAddress);
         bAdvancedInfo = view.findViewById(R.id.bAdvancedInfo);
         llAdvancedInfo = view.findViewById(R.id.llAdvancedInfo);
@@ -114,31 +121,11 @@ public class GenerateReviewFragment extends Fragment {
         tvWalletSpendKey.setTextIsSelectable(allowCopy);
         tvWalletPassword.setTextIsSelectable(allowCopy);
 
-        bAccept.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                acceptWallet();
-            }
-        });
-        view.findViewById(R.id.bCopyViewKey).setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                copyViewKey();
-            }
-        });
-        bCopyAddress.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                copyAddress();
-            }
-        });
-        bCopyAddress.setClickable(false);
-        view.findViewById(R.id.bAdvancedInfo).setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                showAdvancedInfo();
-            }
-        });
+        bAccept.setOnClickListener(v -> acceptWallet());
+        view.findViewById(R.id.bCopyViewKey).setOnClickListener(v -> copyViewKey());
+        bCopyAddress.setEnabled(false);
+        bCopyAddress.setOnClickListener(v -> copyAddress());
+        view.findViewById(R.id.bAdvancedInfo).setOnClickListener(v -> showAdvancedInfo());
 
         Bundle args = getArguments();
         type = args.getString(REQUEST_TYPE);
@@ -188,11 +175,12 @@ public class GenerateReviewFragment extends Fragment {
     private class AsyncShow extends AsyncTask<String, Void, Boolean> {
         String name;
         String address;
+        long height;
         String seed;
         String viewKey;
         String spendKey;
         boolean isWatchOnly;
-        Wallet.Status status;
+        Wallet.Status walletStatus;
 
         boolean dialogOpened = false;
 
@@ -224,14 +212,15 @@ public class GenerateReviewFragment extends Fragment {
                 closeWallet = true;
             }
             name = wallet.getName();
-            status = wallet.getStatus();
-            if (status != Wallet.Status.Status_Ok) {
-                Timber.e(wallet.getErrorString());
+            walletStatus = wallet.getStatus();
+            if (!walletStatus.isOk()) {
+                Timber.e(walletStatus.getErrorString());
                 if (closeWallet) wallet.close();
                 return false;
             }
 
             address = wallet.getAddress();
+            height = wallet.getRestoreHeight();
             seed = wallet.getSeed();
             switch (wallet.getDeviceType()) {
                 case Device_Ledger:
@@ -264,6 +253,7 @@ public class GenerateReviewFragment extends Fragment {
                 llPassword.setVisibility(View.VISIBLE);
                 tvWalletPassword.setText(getPassword());
                 tvWalletAddress.setText(address);
+                tvWalletHeight.setText(NumberFormat.getInstance().format(height));
                 if (!seed.isEmpty()) {
                     llMnemonic.setVisibility(View.VISIBLE);
                     tvWalletMnemonic.setText(seed);
@@ -280,17 +270,17 @@ public class GenerateReviewFragment extends Fragment {
                     showAdvanced = true;
                 }
                 if (showAdvanced) bAdvancedInfo.setVisibility(View.VISIBLE);
-                bCopyAddress.setClickable(true);
-                bCopyAddress.setImageResource(R.drawable.ic_content_copy_black_24dp);
+                bCopyAddress.setEnabled(true);
                 activityCallback.setTitle(name, getString(R.string.details_title));
                 activityCallback.setToolbarButton(
                         GenerateReviewFragment.VIEW_TYPE_ACCEPT.equals(type) ? Toolbar.BUTTON_NONE : Toolbar.BUTTON_BACK);
             } else {
                 // TODO show proper error message and/or end the fragment?
-                tvWalletAddress.setText(status.toString());
-                tvWalletMnemonic.setText(status.toString());
-                tvWalletViewKey.setText(status.toString());
-                tvWalletSpendKey.setText(status.toString());
+                tvWalletAddress.setText(walletStatus.toString());
+                tvWalletHeight.setText(walletStatus.toString());
+                tvWalletMnemonic.setText(walletStatus.toString());
+                tvWalletViewKey.setText(walletStatus.toString());
+                tvWalletSpendKey.setText(walletStatus.toString());
             }
             hideProgress();
         }
@@ -344,7 +334,7 @@ public class GenerateReviewFragment extends Fragment {
     }
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(@NonNull Context context) {
         super.onAttach(context);
         if (context instanceof Listener) {
             this.activityCallback = (Listener) context;
@@ -391,7 +381,7 @@ public class GenerateReviewFragment extends Fragment {
     }
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
         String type = getArguments().getString(REQUEST_TYPE); // intance variable <type> not set yet
         if (GenerateReviewFragment.VIEW_TYPE_ACCEPT.equals(type)) {
             inflater.inflate(R.menu.wallet_details_help_menu, menu);
@@ -414,12 +404,13 @@ public class GenerateReviewFragment extends Fragment {
         }
 
         boolean ok = false;
-        if (wallet.getStatus() == Wallet.Status.Status_Ok) {
+        Wallet.Status walletStatus = wallet.getStatus();
+        if (walletStatus.isOk()) {
             wallet.setPassword(newPassword);
             wallet.store();
             ok = true;
         } else {
-            Timber.e(wallet.getErrorString());
+            Timber.e(walletStatus.getErrorString());
         }
         if (closeWallet) wallet.close();
         return ok;
@@ -439,7 +430,7 @@ public class GenerateReviewFragment extends Fragment {
         protected Boolean doInBackground(String... params) {
             if (params.length != 2) return false;
             final String userPassword = params[0];
-            final boolean fingerPassValid = Boolean.valueOf(params[1]);
+            final boolean fingerPassValid = Boolean.parseBoolean(params[1]);
             newPassword = KeyStoreHelper.getCrazyPass(getActivity(), userPassword);
             final boolean success = changeWalletPassword(newPassword);
             if (success) {
@@ -479,7 +470,7 @@ public class GenerateReviewFragment extends Fragment {
         LayoutInflater li = LayoutInflater.from(getActivity());
         View promptsView = li.inflate(R.layout.prompt_changepw, null);
 
-        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
+        AlertDialog.Builder alertDialogBuilder = new MaterialAlertDialogBuilder(getActivity());
         alertDialogBuilder.setView(promptsView);
 
         final TextInputLayout etPasswordA = promptsView.findViewById(R.id.etWalletPasswordA);
@@ -489,7 +480,7 @@ public class GenerateReviewFragment extends Fragment {
         etPasswordB.setHint(getString(R.string.prompt_changepwB, walletName));
 
         LinearLayout llFingerprintAuth = promptsView.findViewById(R.id.llFingerprintAuth);
-        final Switch swFingerprintAllowed = (Switch) llFingerprintAuth.getChildAt(0);
+        final SwitchMaterial swFingerprintAllowed = (SwitchMaterial) llFingerprintAuth.getChildAt(0);
         if (FingerprintHelper.isDeviceSupported(getActivity())) {
             llFingerprintAuth.setVisibility(View.VISIBLE);
 
@@ -498,7 +489,7 @@ public class GenerateReviewFragment extends Fragment {
                 public void onClick(View view) {
                     if (!swFingerprintAllowed.isChecked()) return;
 
-                    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+                    AlertDialog.Builder builder = new MaterialAlertDialogBuilder(getActivity());
                     builder.setMessage(Html.fromHtml(getString(R.string.generate_fingerprint_warn)))
                             .setCancelable(false)
                             .setPositiveButton(getString(R.string.label_ok), null)
@@ -587,7 +578,7 @@ public class GenerateReviewFragment extends Fragment {
                             etPasswordA.setError(getString(R.string.generate_empty_passwordB));
                         } else if (!newPasswordA.equals(newPasswordB)) {
                             etPasswordB.setError(getString(R.string.generate_bad_passwordB));
-                        } else if (newPasswordA.equals(newPasswordB)) {
+                        } else {
                             new AsyncChangePassword().execute(newPasswordA, Boolean.toString(swFingerprintAllowed.isChecked()));
                             Helper.hideKeyboardAlways(getActivity());
                             openDialog.dismiss();
@@ -610,7 +601,7 @@ public class GenerateReviewFragment extends Fragment {
                         etPasswordA.setError(getString(R.string.generate_empty_passwordB));
                     } else if (!newPasswordA.equals(newPasswordB)) {
                         etPasswordB.setError(getString(R.string.generate_bad_passwordB));
-                    } else if (newPasswordA.equals(newPasswordB)) {
+                    } else {
                         new AsyncChangePassword().execute(newPasswordA, Boolean.toString(swFingerprintAllowed.isChecked()));
                         Helper.hideKeyboardAlways(getActivity());
                         openDialog.dismiss();
@@ -621,8 +612,8 @@ public class GenerateReviewFragment extends Fragment {
                 return false;
             }
         });
-        // set FLAG_SECURE to prevent screenshots in Release Mode
-        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+
+        if (Helper.preventScreenshot()) {
             openDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
         }
 

app/src/main/java/com/m2049r/xmrwallet/LoginFragment.java

@@ -19,11 +19,6 @@ package com.m2049r.xmrwallet;
 import android.content.Context;
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.design.widget.FloatingActionButton;
-import android.support.v4.app.Fragment;
-import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -38,12 +33,19 @@ import android.widget.RelativeLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.m2049r.xmrwallet.data.NodeInfo;
 import com.m2049r.xmrwallet.layout.NodeInfoAdapter;
 import com.m2049r.xmrwallet.layout.WalletInfoAdapter;
 import com.m2049r.xmrwallet.model.WalletManager;
 import com.m2049r.xmrwallet.util.Helper;
 import com.m2049r.xmrwallet.util.KeyStoreHelper;
+import com.m2049r.xmrwallet.util.NodePinger;
 import com.m2049r.xmrwallet.util.Notice;
 import com.m2049r.xmrwallet.widget.Toolbar;
 
@@ -63,6 +65,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
     private List<WalletManager.WalletInfo> walletList = new ArrayList<>();
     private List<WalletManager.WalletInfo> displayedList = new ArrayList<>();
 
+    private View tvGuntherSays;
     private ImageView ivGunther;
     private TextView tvNodeName;
     private TextView tvNodeAddress;
@@ -103,6 +106,8 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
 
         Set<NodeInfo> getFavouriteNodes();
 
+        Set<NodeInfo> getOrPopulateFavourites();
+
         boolean hasLedger();
     }
 
@@ -130,11 +135,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         activityCallback.setTitle(null);
         activityCallback.setToolbarButton(Toolbar.BUTTON_CREDITS);
         activityCallback.showNet();
-        NodeInfo node = activityCallback.getNode();
-        if (node == null)
-            findBestNode();
-        else
-            showNode(node);
+        pingSelectedNode();
     }
 
     @Override
@@ -143,6 +144,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         Timber.d("onCreateView");
         View view = inflater.inflate(R.layout.fragment_login, container, false);
 
+        tvGuntherSays = view.findViewById(R.id.tvGuntherSays);
         ivGunther = view.findViewById(R.id.ivGunther);
         fabScreen = view.findViewById(R.id.fabScreen);
         fab = view.findViewById(R.id.fab);
@@ -183,23 +185,10 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
 
         pbNode = view.findViewById(R.id.pbNode);
         llNode = view.findViewById(R.id.llNode);
-        llNode.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                if (activityCallback.getFavouriteNodes().isEmpty())
-                    startNodePrefs();
-                else
-                    findBestNode();
-            }
-        });
+        llNode.setOnClickListener(v -> startNodePrefs());
         tvNodeName = view.findViewById(R.id.tvNodeName);
         tvNodeAddress = view.findViewById(R.id.tvNodeAddress);
-        view.findViewById(R.id.ibOption).setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                startNodePrefs();
-            }
-        });
+        view.findViewById(R.id.ibRenew).setOnClickListener(v -> findBestNode());
 
         Helper.hideKeyboard(getActivity());
 
@@ -275,13 +264,15 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         if (displayedList.isEmpty()) {
             fab.startAnimation(fab_pulse);
             if (ivGunther.getDrawable() == null) {
-                ivGunther.setImageResource(R.drawable.gunther_desaturated);
+                ivGunther.setImageResource(R.drawable.ic_emptygunther);
+                tvGuntherSays.setVisibility(View.VISIBLE);
             }
         } else {
             fab.clearAnimation();
             if (ivGunther.getDrawable() != null) {
                 ivGunther.setImageDrawable(null);
             }
+            tvGuntherSays.setVisibility(View.GONE);
         }
 
         // remove information of non-existent wallet
@@ -416,33 +407,61 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
     }
 
     public void findBestNode() {
-        new AsyncFindBestNode().execute();
+        new AsyncFindBestNode().execute(AsyncFindBestNode.FIND_BEST);
     }
 
-    private class AsyncFindBestNode extends AsyncTask<Void, Void, NodeInfo> {
+    public void pingSelectedNode() {
+        new AsyncFindBestNode().execute(AsyncFindBestNode.PING_SELECTED);
+    }
+
+    private NodeInfo autoselect(Set<NodeInfo> nodes) {
+        if (nodes.isEmpty()) return null;
+        NodePinger.execute(nodes, null);
+        List<NodeInfo> nodeList = new ArrayList<>(nodes);
+        Collections.sort(nodeList, NodeInfo.BestNodeComparator);
+        return nodeList.get(0);
+    }
+
+    private class AsyncFindBestNode extends AsyncTask<Integer, Void, NodeInfo> {
+        final static int PING_SELECTED = 0;
+        final static int FIND_BEST = 1;
+
         @Override
         protected void onPreExecute() {
             super.onPreExecute();
             pbNode.setVisibility(View.VISIBLE);
             llNode.setVisibility(View.INVISIBLE);
-            activityCallback.setNode(null);
         }
 
         @Override
-        protected NodeInfo doInBackground(Void... params) {
-            List<NodeInfo> nodesToTest = new ArrayList<>(activityCallback.getFavouriteNodes());
-            Timber.d("testing best node from %d", nodesToTest.size());
-            if (nodesToTest.isEmpty()) return null;
-            for (NodeInfo node : nodesToTest) {
-                node.testRpcService(); // TODO: do this in parallel?
-                // no: it's better if it looks like it's doing something
-            }
-            Collections.sort(nodesToTest, NodeInfo.BestNodeComparator);
-            NodeInfo bestNode = nodesToTest.get(0);
-            if (bestNode.isValid())
-                return nodesToTest.get(0);
-            else
+        protected NodeInfo doInBackground(Integer... params) {
+            Set<NodeInfo> favourites = activityCallback.getOrPopulateFavourites();
+            NodeInfo selectedNode;
+            if (params[0] == FIND_BEST) {
+                selectedNode = autoselect(favourites);
+            } else if (params[0] == PING_SELECTED) {
+                selectedNode = activityCallback.getNode();
+                if (!activityCallback.getFavouriteNodes().contains(selectedNode))
+                    selectedNode = null; // it's not in the favourites (any longer)
+                if (selectedNode == null)
+                    for (NodeInfo node : favourites) {
+                        if (node.isSelected()) {
+                            selectedNode = node;
+                            break;
+                        }
+                    }
+                if (selectedNode == null) { // autoselect
+                    selectedNode = autoselect(favourites);
+                } else
+                    selectedNode.testRpcService();
+            } else throw new IllegalStateException();
+            if ((selectedNode != null) && selectedNode.isValid()) {
+                activityCallback.setNode(selectedNode);
+                return selectedNode;
+            } else {
+                activityCallback.setNode(null);
                 return null;
+            }
         }
 
         @Override
@@ -450,22 +469,14 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
             if (!isAdded()) return;
             pbNode.setVisibility(View.INVISIBLE);
             llNode.setVisibility(View.VISIBLE);
-            activityCallback.setNode(result);
             if (result != null) {
                 Timber.d("found a good node %s", result.toString());
                 showNode(result);
             } else {
-                if (!activityCallback.getFavouriteNodes().isEmpty()) {
-                    tvNodeName.setText(getResources().getText(R.string.node_refresh_hint));
-                    tvNodeName.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_refresh_black_24dp, 0, 0, 0);
-                    tvNodeAddress.setText(null);
-                    tvNodeAddress.setVisibility(View.GONE);
-                } else {
-                    tvNodeName.setText(getResources().getText(R.string.node_create_hint));
-                    tvNodeName.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
-                    tvNodeAddress.setText(null);
-                    tvNodeAddress.setVisibility(View.GONE);
-                }
+                tvNodeName.setText(getResources().getText(R.string.node_create_hint));
+                tvNodeName.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
+                tvNodeAddress.setText(null);
+                tvNodeAddress.setVisibility(View.GONE);
             }
         }
 
@@ -478,12 +489,11 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
     private void showNode(NodeInfo nodeInfo) {
         tvNodeName.setText(nodeInfo.getName());
         tvNodeName.setCompoundDrawablesWithIntrinsicBounds(NodeInfoAdapter.getPingIcon(nodeInfo), 0, 0, 0);
-        tvNodeAddress.setText(nodeInfo.getAddress());
+        Helper.showTimeDifference(tvNodeAddress, nodeInfo.getTimestamp());
         tvNodeAddress.setVisibility(View.VISIBLE);
     }
 
     private void startNodePrefs() {
-        activityCallback.setNode(null);
         activityCallback.onNodePrefs();
     }
 }

app/src/main/java/com/m2049r/xmrwallet/MainActivity.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018-2020 EarlOfEgo, m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Intent;
+import android.os.Bundle;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.m2049r.xmrwallet.onboarding.OnBoardingActivity;
+import com.m2049r.xmrwallet.onboarding.OnBoardingManager;
+
+public class MainActivity extends BaseActivity {
+    @Override
+    protected void onCreate(@Nullable final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        if (OnBoardingManager.shouldShowOnBoarding(getApplicationContext())) {
+            startActivity(new Intent(this, OnBoardingActivity.class));
+        } else {
+            startActivity(new Intent(this, LoginActivity.class));
+        }
+        finish();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/ReceiveFragment.java

@@ -25,12 +25,6 @@ import android.net.Uri;
 import android.nfc.NfcManager;
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.design.widget.TextInputLayout;
-import android.support.v4.app.Fragment;
-import android.support.v4.content.FileProvider;
-import android.support.v4.view.MenuItemCompat;
-import android.support.v7.widget.ShareActionProvider;
 import android.text.Editable;
 import android.text.InputType;
 import android.text.TextWatcher;
@@ -42,7 +36,6 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.inputmethod.EditorInfo;
-import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ImageButton;
 import android.widget.ImageView;
@@ -50,6 +43,13 @@ import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.ShareActionProvider;
+import androidx.core.content.FileProvider;
+import androidx.core.view.MenuItemCompat;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.textfield.TextInputLayout;
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.EncodeHintType;
 import com.google.zxing.WriterException;
@@ -82,10 +82,11 @@ public class ReceiveFragment extends Fragment {
     private ExchangeView evAmount;
     private TextView tvQrCode;
     private ImageView ivQrCode;
+    private View cvQrCode;
     private ImageView ivQrCodeFull;
     private EditText etDummy;
     private ImageButton bCopyAddress;
-    private Button bSubaddress;
+    private ImageButton bSubaddress;
 
     private Wallet wallet = null;
     private boolean isMyWallet = false;
@@ -109,6 +110,7 @@ public class ReceiveFragment extends Fragment {
         tvAddress = view.findViewById(R.id.tvAddress);
         etNotes = view.findViewById(R.id.etNotes);
         evAmount = view.findViewById(R.id.evAmount);
+        cvQrCode = view.findViewById(R.id.cvQrCode);
         ivQrCode = view.findViewById(R.id.qrCode);
         tvQrCode = view.findViewById(R.id.tvQrCode);
         ivQrCodeFull = view.findViewById(R.id.qrCodeFull);
@@ -118,13 +120,9 @@ public class ReceiveFragment extends Fragment {
 
         etDummy.setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
 
-        bCopyAddress.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                copyAddress();
-            }
-        });
+        bCopyAddress.setOnClickListener(v -> copyAddress());
         enableCopyAddress(false);
+        enableSubaddressButton(false);
 
         evAmount.setOnNewAmountListener(new ExchangeView.OnNewAmountListener() {
             @Override
@@ -190,7 +188,7 @@ public class ReceiveFragment extends Fragment {
             }
         });
 
-        ivQrCode.setOnClickListener(new View.OnClickListener() {
+        cvQrCode.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Helper.hideKeyboard(getActivity());
@@ -302,7 +300,7 @@ public class ReceiveFragment extends Fragment {
         File imagePath = new File(getActivity().getCacheDir(), "images");
         File png = new File(imagePath, "QR.png");
         Uri contentUri = FileProvider.getUriForFile(getActivity(),
-                "com.m2049r.xmrwallet.fileprovider", png);
+                BuildConfig.APPLICATION_ID + ".fileprovider", png);
         if (contentUri != null) {
             Intent shareIntent = new Intent();
             shareIntent.setAction(Intent.ACTION_SEND);
@@ -315,13 +313,8 @@ public class ReceiveFragment extends Fragment {
         return null;
     }
 
-    void enableSubaddressButton(boolean enable) {
+    private void enableSubaddressButton(boolean enable) {
         bSubaddress.setEnabled(enable);
-        if (enable) {
-            bSubaddress.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_settings_orange_24dp, 0, 0);
-        } else {
-            bSubaddress.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_settings_gray_24dp, 0, 0);
-        }
     }
 
     void copyAddress() {
@@ -371,16 +364,13 @@ public class ReceiveFragment extends Fragment {
         listenerCallback.setSubtitle(wallet.getAccountLabel());
         tvAddress.setText(wallet.getAddress());
         enableCopyAddress(true);
+        enableSubaddressButton(true);
         hideProgress();
         generateQr();
     }
 
     private void enableCopyAddress(boolean enable) {
-        bCopyAddress.setClickable(enable);
-        if (enable)
-            bCopyAddress.setImageResource(R.drawable.ic_content_copy_black_24dp);
-        else
-            bCopyAddress.setImageResource(R.drawable.ic_content_nocopy_black_24dp);
+        bCopyAddress.setEnabled(enable);
     }
 
     private void loadAndShow(String walletPath, String password) {
@@ -574,6 +564,7 @@ public class ReceiveFragment extends Fragment {
     @Override
     public void onPause() {
         Timber.d("onPause()");
+        Helper.hideKeyboard(getActivity());
         super.onPause();
     }
 
@@ -619,6 +610,8 @@ public class ReceiveFragment extends Fragment {
             super.onPostExecute(result);
             if (dialogOpened)
                 progressCallback.dismissProgressDialog();
+            if (!isAdded()) // never mind then
+                return;
             tvAddress.setText(newSubaddress);
             tvAddressLabel.setText(getString(R.string.generate_address_label_sub,
                     wallet.getNumSubaddresses() - 1));

app/src/main/java/com/m2049r/xmrwallet/ScannerFragment.java

@@ -19,7 +19,7 @@ package com.m2049r.xmrwallet;
 import android.content.Context;
 import android.os.Bundle;
 import android.os.Handler;
-import android.support.v4.app.Fragment;
+import androidx.fragment.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;

app/src/main/java/com/m2049r/xmrwallet/SecureActivity.java

@@ -17,12 +17,18 @@
 package com.m2049r.xmrwallet;
 
 import android.content.Context;
+import android.content.res.Configuration;
+import android.os.Build;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v7.app.AppCompatActivity;
 
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.m2049r.xmrwallet.util.Helper;
 import com.m2049r.xmrwallet.util.LocaleHelper;
 
+import java.util.Locale;
+
 import static android.view.WindowManager.LayoutParams;
 
 public abstract class SecureActivity extends AppCompatActivity {
@@ -30,14 +36,42 @@ public abstract class SecureActivity extends AppCompatActivity {
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        // set FLAG_SECURE to prevent screenshots in Release Mode
-        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+        if (Helper.preventScreenshot()) {
             getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);
         }
     }
 
     @Override
-    protected void attachBaseContext(Context context) {
-        super.attachBaseContext(LocaleHelper.setLocale(context, LocaleHelper.getLocale(context)));
+    protected void attachBaseContext(Context newBase) {
+        super.attachBaseContext(newBase);
+        applyOverrideConfiguration(new Configuration());
+    }
+
+    @Override
+    public void applyOverrideConfiguration(Configuration newConfig) {
+        super.applyOverrideConfiguration(updateConfigurationIfSupported(newConfig));
+    }
+
+    private Configuration updateConfigurationIfSupported(Configuration config) {
+        // Configuration.getLocales is added after 24 and Configuration.locale is deprecated in 24
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            if (!config.getLocales().isEmpty()) {
+                return config;
+            }
+        } else {
+            if (config.locale != null) {
+                return config;
+            }
+        }
+
+        Locale locale = LocaleHelper.getPreferredLocale(this);
+        if (locale != null) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+                config.setLocale(locale);
+            } else {
+                config.locale = locale;
+            }
+        }
+        return config;
     }
 }

app/src/main/java/com/m2049r/xmrwallet/TxFragment.java

@@ -19,24 +19,24 @@ package com.m2049r.xmrwallet;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
-import android.support.v4.content.ContextCompat;
 import android.text.InputType;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.Nullable;
+import androidx.core.content.ContextCompat;
+import androidx.fragment.app.Fragment;
+
+import com.m2049r.xmrwallet.data.UserNotes;
 import com.m2049r.xmrwallet.model.TransactionInfo;
 import com.m2049r.xmrwallet.model.Transfer;
 import com.m2049r.xmrwallet.model.Wallet;
 import com.m2049r.xmrwallet.util.Helper;
-import com.m2049r.xmrwallet.data.UserNotes;
 import com.m2049r.xmrwallet.widget.Toolbar;
 
 import java.text.SimpleDateFormat;
@@ -71,7 +71,6 @@ public class TxFragment extends Fragment {
     private TextView tvTxFee;
     private TextView tvTxTransfers;
     private TextView etTxNotes;
-    private Button bTxNotes;
 
     // XMRTO stuff
     private View cvXmrTo;
@@ -102,21 +101,9 @@ public class TxFragment extends Fragment {
         tvTxFee = view.findViewById(R.id.tvTxFee);
         tvTxTransfers = view.findViewById(R.id.tvTxTransfers);
         etTxNotes = view.findViewById(R.id.etTxNotes);
-        bTxNotes = view.findViewById(R.id.bTxNotes);
 
         etTxNotes.setRawInputType(InputType.TYPE_CLASS_TEXT);
 
-        bTxNotes.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                info.notes = null; // force reload on next view
-                bTxNotes.setEnabled(false);
-                etTxNotes.setEnabled(false);
-                userNotes.setNote(etTxNotes.getText().toString());
-                activityCallback.onSetNote(info.hash, userNotes.txNotes);
-            }
-        });
-
         tvTxXmrToKey.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -131,14 +118,6 @@ public class TxFragment extends Fragment {
         return view;
     }
 
-    public void onNotesSet(boolean reload) {
-        bTxNotes.setEnabled(true);
-        etTxNotes.setEnabled(true);
-        if (reload) {
-            loadNotes(this.info);
-        }
-    }
-
     void shareTxInfo() {
         if (this.info == null) return;
         StringBuffer sb = new StringBuffer();
@@ -263,9 +242,9 @@ public class TxFragment extends Fragment {
         } else if (info.isPending) {
             setTxColour(ContextCompat.getColor(getContext(), R.color.tx_pending));
         } else if (info.direction == TransactionInfo.Direction.Direction_In) {
-            setTxColour(ContextCompat.getColor(getContext(), R.color.tx_green));
+            setTxColour(ContextCompat.getColor(getContext(), R.color.tx_plus));
         } else {
-            setTxColour(ContextCompat.getColor(getContext(), R.color.tx_red));
+            setTxColour(ContextCompat.getColor(getContext(), R.color.tx_minus));
         }
         Set<String> destinations = new HashSet<>();
         StringBuffer sb = new StringBuffer();
@@ -315,7 +294,6 @@ public class TxFragment extends Fragment {
         }
     }
 
-
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -337,9 +315,9 @@ public class TxFragment extends Fragment {
 
         String getTxNotes(String hash);
 
-        String getTxAddress(int major, int minor);
+        boolean setTxNotes(String txId, String txNotes);
 
-        void onSetNote(String txId, String notes);
+        String getTxAddress(int major, int minor);
 
         void setToolbarButton(int type);
 
@@ -357,4 +335,16 @@ public class TxFragment extends Fragment {
                     + " must implement Listener");
         }
     }
-}
+
+    @Override
+    public void onPause() {
+        if (!etTxNotes.getText().toString().equals(userNotes.note)) { // notes have changed
+            // save them
+            userNotes.setNote(etTxNotes.getText().toString());
+            info.notes = userNotes.txNotes;
+            activityCallback.setTxNotes(info.hash, info.notes);
+        }
+        Helper.hideKeyboard(getActivity());
+        super.onPause();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/WalletFragment.java

@@ -17,12 +17,10 @@
 package com.m2049r.xmrwallet;
 
 import android.content.Context;
+import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
-import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -38,6 +36,11 @@ import android.widget.ProgressBar;
 import android.widget.Spinner;
 import android.widget.TextView;
 
+import androidx.annotation.Nullable;
+import androidx.core.content.ContextCompat;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+
 import com.github.brnunes.swipeablerecyclerview.SwipeableRecyclerViewTouchListener;
 import com.m2049r.xmrwallet.layout.TransactionInfoAdapter;
 import com.m2049r.xmrwallet.model.TransactionInfo;
@@ -50,9 +53,8 @@ import com.m2049r.xmrwallet.widget.Toolbar;
 
 import java.text.NumberFormat;
 import java.util.ArrayList;
-import java.util.Date;
+import java.util.Arrays;
 import java.util.List;
-import java.util.stream.Collectors;
 
 import timber.log.Timber;
 
@@ -71,6 +73,8 @@ public class WalletFragment extends Fragment
     private ProgressBar pbProgress;
     private Button bReceive;
     private Button bSend;
+    private ImageView ivStreetGunther;
+    private Drawable streetGunther = null;
 
     private Spinner sCurrency;
 
@@ -98,11 +102,12 @@ public class WalletFragment extends Fragment
                              Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.fragment_wallet, container, false);
 
+        ivStreetGunther = view.findViewById(R.id.ivStreetGunther);
         tvStreetView = view.findViewById(R.id.tvStreetView);
         llBalance = view.findViewById(R.id.llBalance);
         flExchange = view.findViewById(R.id.flExchange);
         ((ProgressBar) view.findViewById(R.id.pbExchange)).getIndeterminateDrawable().
-                setColorFilter(getResources().getColor(R.color.trafficGray),
+                setColorFilter(getResources().getColor(R.color.progress_circle),
                         android.graphics.PorterDuff.Mode.MULTIPLY);
 
         tvProgress = view.findViewById(R.id.tvProgress);
@@ -114,9 +119,12 @@ public class WalletFragment extends Fragment
         ivSynced = view.findViewById(R.id.ivSynced);
 
         sCurrency = view.findViewById(R.id.sCurrency);
-        ArrayAdapter currencyAdapter = ArrayAdapter.createFromResource(getContext(), R.array.currency, R.layout.item_spinner_balance);
-        currencyAdapter.setDropDownViewResource(R.layout.item_spinner_dropdown_item);
-        sCurrency.setAdapter(currencyAdapter);
+        List<String> currencies = new ArrayList<>();
+        currencies.add(Helper.BASE_CRYPTO);
+        currencies.addAll(Arrays.asList(getResources().getStringArray(R.array.currency)));
+        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<>(getContext(), R.layout.item_spinner_balance, currencies);
+        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        sCurrency.setAdapter(spinnerAdapter);
 
         bSend = view.findViewById(R.id.bSend);
         bReceive = view.findViewById(R.id.bReceive);
@@ -197,13 +205,15 @@ public class WalletFragment extends Fragment
 
     void showBalance(String balance) {
         tvBalance.setText(balance);
-        if (!activityCallback.isStreetMode()) {
+        final boolean streetMode = activityCallback.isStreetMode();
+        if (!streetMode) {
             llBalance.setVisibility(View.VISIBLE);
             tvStreetView.setVisibility(View.INVISIBLE);
         } else {
             llBalance.setVisibility(View.INVISIBLE);
             tvStreetView.setVisibility(View.VISIBLE);
         }
+        setStreetModeBackground(streetMode);
     }
 
     void showUnconfirmed(double unconfirmedAmount) {
@@ -219,8 +229,8 @@ public class WalletFragment extends Fragment
         if (isExchanging) return; // wait for exchange to finish - it will fire this itself then.
         // at this point selection is XMR in case of error
         String displayB;
-        double amountA = Double.parseDouble(Wallet.getDisplayAmount(unlockedBalance)); // crash if this fails!
-        if (!Helper.CRYPTO.equals(balanceCurrency)) { // not XMR
+        double amountA = Helper.getDecimalAmount(unlockedBalance).doubleValue();
+        if (!Helper.BASE_CRYPTO.equals(balanceCurrency)) { // not XMR
             double amountB = amountA * balanceRate;
             displayB = Helper.getFormattedAmount(amountB, false);
         } else { // XMR
@@ -229,23 +239,23 @@ public class WalletFragment extends Fragment
         showBalance(displayB);
     }
 
-    String balanceCurrency = Helper.CRYPTO;
+    String balanceCurrency = Helper.BASE_CRYPTO;
     double balanceRate = 1.0;
 
     private final ExchangeApi exchangeApi = Helper.getExchangeApi();
 
     void refreshBalance() {
-        double unconfirmedXmr = Double.parseDouble(Helper.getDisplayAmount(balance - unlockedBalance));
+        double unconfirmedXmr = Helper.getDecimalAmount(balance - unlockedBalance).doubleValue();
         showUnconfirmed(unconfirmedXmr);
         if (sCurrency.getSelectedItemPosition() == 0) { // XMR
-            double amountXmr = Double.parseDouble(Wallet.getDisplayAmount(unlockedBalance)); // assume this cannot fail!
+            double amountXmr = Helper.getDecimalAmount(unlockedBalance).doubleValue();
             showBalance(Helper.getFormattedAmount(amountXmr, true));
         } else { // not XMR
             String currency = (String) sCurrency.getSelectedItem();
             Timber.d(currency);
             if (!currency.equals(balanceCurrency) || (balanceRate <= 0)) {
                 showExchanging();
-                exchangeApi.queryExchangeRate(Helper.CRYPTO, currency,
+                exchangeApi.queryExchangeRate(Helper.BASE_CRYPTO, currency,
                         new ExchangeCallback() {
                             @Override
                             public void onSuccess(final ExchangeRate exchangeRate) {
@@ -294,17 +304,17 @@ public class WalletFragment extends Fragment
 
     public void exchangeFailed() {
         sCurrency.setSelection(0, true); // default to XMR
-        double amountXmr = Double.parseDouble(Wallet.getDisplayAmount(unlockedBalance)); // assume this cannot fail!
+        double amountXmr = Helper.getDecimalAmount(unlockedBalance).doubleValue();
         showBalance(Helper.getFormattedAmount(amountXmr, true));
         hideExchanging();
     }
 
     public void exchange(final ExchangeRate exchangeRate) {
         hideExchanging();
-        if (!Helper.CRYPTO.equals(exchangeRate.getBaseCurrency())) {
+        if (!Helper.BASE_CRYPTO.equals(exchangeRate.getBaseCurrency())) {
             Timber.e("Not XMR");
             sCurrency.setSelection(0, true);
-            balanceCurrency = Helper.CRYPTO;
+            balanceCurrency = Helper.BASE_CRYPTO;
             balanceRate = 1.0;
         } else {
             int spinnerPosition = ((ArrayAdapter) sCurrency.getAdapter()).getPosition(exchangeRate.getQuoteCurrency());
@@ -354,6 +364,15 @@ public class WalletFragment extends Fragment
         if (isVisible()) enableAccountsList(true); //otherwise it is enabled in onResume()
     }
 
+    public void unsync() {
+        if (!activityCallback.isWatchOnly()) {
+            bSend.setVisibility(View.INVISIBLE);
+            bSend.setEnabled(false);
+        }
+        if (isVisible()) enableAccountsList(false); //otherwise it is enabled in onResume()
+        firstBlock = 0;
+    }
+
     boolean walletLoaded = false;
 
     public void onLoaded() {
@@ -526,4 +545,13 @@ public class WalletFragment extends Fragment
         }
     }
 
+    public void setStreetModeBackground(boolean enable) {
+        //TODO figure out why gunther disappears on return from send although he is still set
+        if (enable) {
+            if (streetGunther == null)
+                streetGunther = ContextCompat.getDrawable(getContext(), R.drawable.ic_gunther_streetmode);
+            ivStreetGunther.setImageDrawable(streetGunther);
+        } else
+            ivStreetGunther.setImageDrawable(null);
+    }
 }

app/src/main/java/com/m2049r/xmrwallet/XmrWalletApplication.java

@@ -20,9 +20,12 @@ package com.m2049r.xmrwallet;
 import android.app.Application;
 import android.content.Context;
 import android.content.res.Configuration;
+import android.os.Build;
 
 import com.m2049r.xmrwallet.model.NetworkType;
+import com.m2049r.xmrwallet.util.DayNightMode;
 import com.m2049r.xmrwallet.util.LocaleHelper;
+import com.m2049r.xmrwallet.util.NightmodeHelper;
 
 import timber.log.Timber;
 
@@ -34,18 +37,23 @@ public class XmrWalletApplication extends Application {
         if (BuildConfig.DEBUG) {
             Timber.plant(new Timber.DebugTree());
         }
+        NightmodeHelper.setPreferredNightmode(this);
     }
 
     @Override
     protected void attachBaseContext(Context context) {
-        super.attachBaseContext(LocaleHelper.setLocale(context, LocaleHelper.getLocale(context)));
+        super.attachBaseContext(LocaleHelper.setPreferredLocale(context));
     }
 
     @Override
     public void onConfigurationChanged(Configuration configuration) {
         super.onConfigurationChanged(configuration);
-        LocaleHelper.updateSystemDefaultLocale(configuration.locale);
-        LocaleHelper.setLocale(XmrWalletApplication.this, LocaleHelper.getLocale(XmrWalletApplication.this));
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            LocaleHelper.updateSystemDefaultLocale(configuration.getLocales().get(0));
+        } else {
+            LocaleHelper.updateSystemDefaultLocale(configuration.locale);
+        }
+        LocaleHelper.setPreferredLocale(this);
     }
 
     static public NetworkType getNetworkType() {
@@ -54,7 +62,7 @@ public class XmrWalletApplication extends Application {
                 return NetworkType.NetworkType_Mainnet;
             case "stagenet":
                 return NetworkType.NetworkType_Stagenet;
-            case "testnet":
+            case "devnet": // flavors cannot start with "test"
                 return NetworkType.NetworkType_Testnet;
             default:
                 throw new IllegalStateException("unknown net flavor " + BuildConfig.FLAVOR_net);

app/src/main/java/com/m2049r/xmrwallet/data/BarcodeData.java

@@ -59,42 +59,36 @@ public class BarcodeData {
     final public Asset asset;
     final public String address;
     final public String addressName;
-    final public String paymentId;
     final public String amount;
     final public String description;
     final public Security security;
     final public String bip70;
 
     public BarcodeData(Asset asset, String address) {
-        this(asset, address, null, null, null, null, Security.NORMAL);
+        this(asset, address, null, null, null, Security.NORMAL);
     }
 
     public BarcodeData(Asset asset, String address, String amount) {
-        this(asset, address, null, null, null, amount, Security.NORMAL);
+        this(asset, address, null, null, amount, Security.NORMAL);
     }
 
     public BarcodeData(Asset asset, String address, String amount, String description, Security security) {
-        this(asset, address, null, null, description, amount, security);
-    }
-
-    public BarcodeData(Asset asset, String address, String paymentId, String amount) {
-        this(asset, address, null, paymentId, null, amount, Security.NORMAL);
+        this(asset, address, null, description, amount, security);
     }
 
     public BarcodeData(Asset asset, String address, String paymentId, String description, String amount) {
-        this(asset, address, null, paymentId, description, amount, Security.NORMAL);
+        this(asset, address, null, description, amount, Security.NORMAL);
     }
 
-    public BarcodeData(Asset asset, String address, String addressName, String paymentId, String description, String amount, Security security) {
-        this(asset, address, addressName, null, paymentId, description, amount, security);
+    public BarcodeData(Asset asset, String address, String addressName, String description, String amount, Security security) {
+        this(asset, address, addressName, null, description, amount, security);
     }
 
-    public BarcodeData(Asset asset, String address, String addressName, String bip70, String paymentId, String description, String amount, Security security) {
+    public BarcodeData(Asset asset, String address, String addressName, String bip70, String description, String amount, Security security) {
         this.asset = asset;
         this.address = address;
         this.bip70 = bip70;
         this.addressName = addressName;
-        this.paymentId = paymentId;
         this.description = description;
         this.amount = amount;
         this.security = security;
@@ -110,11 +104,6 @@ public class BarcodeData {
         StringBuilder sb = new StringBuilder();
         sb.append(BarcodeData.XMR_SCHEME).append(address);
         boolean first = true;
-        if ((paymentId != null) && !paymentId.isEmpty()) {
-            sb.append("?");
-            first = false;
-            sb.append(BarcodeData.XMR_PAYMENTID).append('=').append(paymentId);
-        }
         if ((description != null) && !description.isEmpty()) {
             sb.append(first ? "?" : "&");
             first = false;
@@ -185,8 +174,11 @@ public class BarcodeData {
         String address = monero.getPath();
 
         String paymentId = parms.get(XMR_PAYMENTID);
-        // deal with empty payment_id created by non-spec-conforming apps
-        if ((paymentId != null) && paymentId.isEmpty()) paymentId = null;
+        // no support for payment ids!
+        if (paymentId != null) {
+            Timber.e("no support for payment ids!");
+            return null;
+        }
 
         String description = parms.get(XMR_DESCRIPTION);
         String amount = parms.get(XMR_AMOUNT);
@@ -198,12 +190,8 @@ public class BarcodeData {
                 return null; // we have an amount but its not a number!
             }
         }
-        if ((paymentId != null) && !Wallet.isPaymentIdValid(paymentId)) {
-            Timber.d("paymentId invalid");
-            return null;
-        }
 
-        if (!Wallet.isAddressValid(address)) {
+        if ((address == null) || !Wallet.isAddressValid(address)) {
             Timber.d("address invalid");
             return null;
         }
@@ -267,7 +255,7 @@ public class BarcodeData {
                 Timber.d("[%s] is not http url", bip70);
                 return null;
             }
-            return new BarcodeData(BarcodeData.Asset.BTC, null, null, bip70, null, description, null, Security.NORMAL);
+            return new BarcodeData(BarcodeData.Asset.BTC, null, null, bip70, description, null, Security.NORMAL);
         }
         if (!BitcoinAddressValidator.validate(address)) {
             Timber.d("BTC address (%s) invalid", address);

app/src/main/java/com/m2049r/xmrwallet/data/DefaultNodes.java

@@ -0,0 +1,19 @@
+package com.m2049r.xmrwallet.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+// Nodes stolen from https://moneroworld.com/#nodes
+
+@AllArgsConstructor
+public enum DefaultNodes {
+    MONERUJO("nodex.monerujo.io:18081"),
+    XMRTO("node.xmr.to:18081"),
+    SUPPORTXMR("node.supportxmr.com:18081"),
+    HASHVAULT("nodes.hashvault.pro:18081"),
+    MONEROWORLD("node.moneroworld.com:18089"),
+    XMRTW("opennode.xmr-tw.org:18089");
+
+    @Getter
+    private final String uri;
+}

app/src/main/java/com/m2049r/xmrwallet/data/Node.java

@@ -26,6 +26,8 @@ import java.net.URLDecoder;
 import java.net.URLEncoder;
 import java.net.UnknownHostException;
 
+import lombok.Getter;
+import lombok.Setter;
 import timber.log.Timber;
 
 public class Node {
@@ -33,15 +35,29 @@ public class Node {
     static public final String STAGENET = "stagenet";
     static public final String TESTNET = "testnet";
 
+    @Getter
     private String name = null;
+    @Getter
     final private NetworkType networkType;
     InetAddress hostAddress;
+    @Getter
     private String host;
+    @Getter
+    @Setter
     int rpcPort = 0;
     private int levinPort = 0;
+    @Getter
+    @Setter
     private String username = "";
+    @Getter
+    @Setter
     private String password = "";
+    @Getter
+    @Setter
     private boolean favourite = false;
+    @Getter
+    @Setter
+    private boolean selected = false;
 
     @Override
     public int hashCode() {
@@ -193,7 +209,6 @@ public class Node {
         this.levinPort = socketAddress.getPort();
         this.username = "";
         this.password = "";
-        //this.name = socketAddress.getHostName(); // triggers DNS so we don't do it by default
     }
 
     public String getAddress() {
@@ -204,14 +219,6 @@ public class Node {
         return hostAddress.getHostAddress();
     }
 
-    public String getHost() {
-        return host;
-    }
-
-    public int getRpcPort() {
-        return rpcPort;
-    }
-
     public void setHost(String host) throws UnknownHostException {
         if ((host == null) || (host.isEmpty()))
             throw new UnknownHostException("loopback not supported (yet?)");
@@ -219,18 +226,6 @@ public class Node {
         this.hostAddress = InetAddress.getByName(host);
     }
 
-    public void setUsername(String user) {
-        username = user;
-    }
-
-    public void setPassword(String pass) {
-        password = pass;
-    }
-
-    public void setRpcPort(int port) {
-        this.rpcPort = port;
-    }
-
     public void setName() {
         if (name == null)
             this.name = hostAddress.getHostName();
@@ -243,30 +238,6 @@ public class Node {
             this.name = name;
     }
 
-    public String getName() {
-        return name;
-    }
-
-    public NetworkType getNetworkType() {
-        return networkType;
-    }
-
-    public String getUsername() {
-        return username;
-    }
-
-    public String getPassword() {
-        return password;
-    }
-
-    public boolean isFavourite() {
-        return favourite;
-    }
-
-    public void setFavourite(boolean favourite) {
-        this.favourite = favourite;
-    }
-
     public void toggleFavourite() {
         favourite = !favourite;
     }

app/src/main/java/com/m2049r/xmrwallet/data/NodeInfo.java

@@ -21,8 +21,8 @@ import com.burgstaller.okhttp.CachingAuthenticatorDecorator;
 import com.burgstaller.okhttp.digest.CachingAuthenticator;
 import com.burgstaller.okhttp.digest.Credentials;
 import com.burgstaller.okhttp.digest.DigestAuthenticator;
-import com.m2049r.levin.scanner.Dispatcher;
 import com.m2049r.levin.scanner.LevinPeer;
+import com.m2049r.xmrwallet.util.NodePinger;
 import com.m2049r.xmrwallet.util.OkHttpHelper;
 
 import org.json.JSONException;
@@ -36,6 +36,8 @@ import java.util.Comparator;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+import lombok.Getter;
+import lombok.Setter;
 import okhttp3.HttpUrl;
 import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
@@ -46,13 +48,24 @@ import okhttp3.ResponseBody;
 import timber.log.Timber;
 
 public class NodeInfo extends Node {
-    final static public int MIN_MAJOR_VERSION = 9;
+    final static public int MIN_MAJOR_VERSION = 14;
+    final static public String RPC_VERSION = "2.0";
 
+    @Getter
     private long height = 0;
+    @Getter
     private long timestamp = 0;
+    @Getter
     private int majorVersion = 0;
+    @Getter
     private double responseTime = Double.MAX_VALUE;
+    @Getter
     private int responseCode = 0;
+    @Getter
+    private boolean tested = false;
+    @Getter
+    @Setter
+    private boolean selecting = false;
 
     public void clear() {
         height = 0;
@@ -60,13 +73,13 @@ public class NodeInfo extends Node {
         responseTime = Double.MAX_VALUE;
         responseCode = 0;
         timestamp = 0;
+        tested = false;
     }
 
     static public NodeInfo fromString(String nodeString) {
         try {
             return new NodeInfo(nodeString);
         } catch (IllegalArgumentException ex) {
-            Timber.w(ex);
             return null;
         }
     }
@@ -112,26 +125,6 @@ public class NodeInfo extends Node {
         super();
     }
 
-    public long getHeight() {
-        return height;
-    }
-
-    public long getTimestamp() {
-        return timestamp;
-    }
-
-    public int getMajorVersion() {
-        return majorVersion;
-    }
-
-    public double getResponseTime() {
-        return responseTime;
-    }
-
-    public int getResponseCode() {
-        return responseCode;
-    }
-
     public boolean isSuccessful() {
         return (responseCode >= 200) && (responseCode < 300);
     }
@@ -144,23 +137,20 @@ public class NodeInfo extends Node {
         return isSuccessful() && (majorVersion >= MIN_MAJOR_VERSION) && (responseTime < Double.MAX_VALUE);
     }
 
-    static public Comparator<NodeInfo> BestNodeComparator = new Comparator<NodeInfo>() {
-        @Override
-        public int compare(NodeInfo o1, NodeInfo o2) {
-            if (o1.isValid()) {
-                if (o2.isValid()) { // both are valid
-                    // higher node wins
-                    int heightDiff = (int) (o2.height - o1.height);
-                    if (Math.abs(heightDiff) > Dispatcher.HEIGHT_WINDOW)
-                        return heightDiff;
-                    // if they are (nearly) equal, faster node wins
-                    return (int) Math.signum(o1.responseTime - o2.responseTime);
-                } else {
-                    return -1;
-                }
+    static public Comparator<NodeInfo> BestNodeComparator = (o1, o2) -> {
+        if (o1.isValid()) {
+            if (o2.isValid()) { // both are valid
+                // higher node wins
+                int heightDiff = (int) (o2.height - o1.height);
+                if (heightDiff != 0)
+                    return heightDiff;
+                // if they are equal, faster node wins
+                return (int) Math.signum(o1.responseTime - o2.responseTime);
             } else {
-                return 1;
+                return -1;
             }
+        } else {
+            return 1;
         }
     };
 
@@ -191,7 +181,7 @@ public class NodeInfo extends Node {
     }
 
     private static final int HTTP_TIMEOUT = OkHttpHelper.HTTP_TIMEOUT;
-    public static final double PING_GOOD = HTTP_TIMEOUT / 3; //ms
+    public static final double PING_GOOD = HTTP_TIMEOUT / 3.0; //ms
     public static final double PING_MEDIUM = 2 * PING_GOOD; //ms
     public static final double PING_BAD = HTTP_TIMEOUT;
 
@@ -199,7 +189,15 @@ public class NodeInfo extends Node {
         return testRpcService(rpcPort);
     }
 
+    public boolean testRpcService(NodePinger.Listener listener) {
+        boolean result = testRpcService(rpcPort);
+        if (listener != null)
+            listener.publish(this);
+        return result;
+    }
+
     private boolean testRpcService(int port) {
+        Timber.d("Testing %s", toNodeString());
         clear();
         try {
             OkHttpClient client = OkHttpHelper.getEagerClient();
@@ -228,11 +226,16 @@ public class NodeInfo extends Node {
                 responseCode = response.code();
                 if (response.isSuccessful()) {
                     ResponseBody respBody = response.body(); // closed through Response object
-                    if ((respBody != null) && (respBody.contentLength() < 1000)) { // sanity check
+                    if ((respBody != null) && (respBody.contentLength() < 2000)) { // sanity check
                         final JSONObject json = new JSONObject(
                                 respBody.string());
-                        final JSONObject header = json.getJSONObject(
-                                "result").getJSONObject("block_header");
+                        String rpcVersion = json.getString("jsonrpc");
+                        if (!RPC_VERSION.equals(rpcVersion))
+                            return false;
+                        final JSONObject result = json.getJSONObject("result");
+                        if (!result.has("credits")) // introduced in monero v0.15.0
+                            return false;
+                        final JSONObject header = result.getJSONObject("block_header");
                         height = header.getLong("height");
                         timestamp = header.getLong("timestamp");
                         majorVersion = header.getInt("major_version");
@@ -241,8 +244,9 @@ public class NodeInfo extends Node {
                 }
             }
         } catch (IOException | JSONException ex) {
-            // failure
-            Timber.d(ex.getMessage());
+            Timber.d(ex);
+        } finally {
+            tested = true;
         }
         return false;
     }

app/src/main/java/com/m2049r/xmrwallet/data/TxData.java

@@ -29,19 +29,16 @@ public class TxData implements Parcelable {
 
     public TxData(TxData txData) {
         this.dstAddr = txData.dstAddr;
-        this.paymentId = txData.paymentId;
         this.amount = txData.amount;
         this.mixin = txData.mixin;
         this.priority = txData.priority;
     }
 
     public TxData(String dstAddr,
-                  String paymentId,
                   long amount,
                   int mixin,
                   PendingTransaction.Priority priority) {
         this.dstAddr = dstAddr;
-        this.paymentId = paymentId;
         this.amount = amount;
         this.mixin = mixin;
         this.priority = priority;
@@ -51,10 +48,6 @@ public class TxData implements Parcelable {
         return dstAddr;
     }
 
-    public String getPaymentId() {
-        return paymentId;
-    }
-
     public long getAmount() {
         return amount;
     }
@@ -71,10 +64,6 @@ public class TxData implements Parcelable {
         this.dstAddr = dstAddr;
     }
 
-    public void setPaymentId(String paymentId) {
-        this.paymentId = paymentId;
-    }
-
     public void setAmount(long amount) {
         this.amount = amount;
     }
@@ -96,7 +85,6 @@ public class TxData implements Parcelable {
     }
 
     private String dstAddr;
-    private String paymentId;
     private long amount;
     private int mixin;
     private PendingTransaction.Priority priority;
@@ -106,7 +94,6 @@ public class TxData implements Parcelable {
     @Override
     public void writeToParcel(Parcel out, int flags) {
         out.writeString(dstAddr);
-        out.writeString(paymentId);
         out.writeLong(amount);
         out.writeInt(mixin);
         out.writeInt(priority.getValue());
@@ -125,7 +112,6 @@ public class TxData implements Parcelable {
 
     protected TxData(Parcel in) {
         dstAddr = in.readString();
-        paymentId = in.readString();
         amount = in.readLong();
         mixin = in.readInt();
         priority = PendingTransaction.Priority.fromInteger(in.readInt());
@@ -142,14 +128,12 @@ public class TxData implements Parcelable {
         StringBuffer sb = new StringBuffer();
         sb.append("dstAddr:");
         sb.append(dstAddr);
-        sb.append(",paymentId:");
-        sb.append(paymentId);
         sb.append(",amount:");
         sb.append(amount);
         sb.append(",mixin:");
         sb.append(mixin);
         sb.append(",priority:");
-        sb.append(String.valueOf(priority));
+        sb.append(priority);
         return sb.toString();
     }
 }

app/src/main/java/com/m2049r/xmrwallet/dialog/AboutFragment.java

@@ -16,26 +16,25 @@
 
 package com.m2049r.xmrwallet.dialog;
 
-import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentTransaction;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
 import android.text.Html;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.m2049r.xmrwallet.BuildConfig;
 import com.m2049r.xmrwallet.R;
 
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
-import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 
 import timber.log.Timber;
@@ -63,15 +62,15 @@ public class AboutFragment extends DialogFragment {
         ((TextView) view.findViewById(R.id.tvHelp)).setText(Html.fromHtml(getLicencesHtml()));
         ((TextView) view.findViewById(R.id.tvVersion)).setText(getString(R.string.about_version, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE));
 
-        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
-        builder.setView(view);
-        builder.setNegativeButton(R.string.about_close,
-                new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int id) {
-                        dialog.dismiss();
-                    }
-                });
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+                .setView(view)
+                .setNegativeButton(R.string.about_close,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int id) {
+                                dialog.dismiss();
+                            }
+                        });
         return builder.create();
     }
 

app/src/main/java/com/m2049r/xmrwallet/dialog/CreditsFragment.java

@@ -16,19 +16,20 @@
 
 package com.m2049r.xmrwallet.dialog;
 
-import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentTransaction;
 import android.text.Html;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.m2049r.xmrwallet.R;
 
 public class CreditsFragment extends DialogFragment {
@@ -54,16 +55,15 @@ public class CreditsFragment extends DialogFragment {
 
         ((TextView) view.findViewById(R.id.tvCredits)).setText(Html.fromHtml(getString(R.string.credits_text)));
 
-        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
-        builder.setView(view);
-        builder.setNegativeButton(R.string.about_close,
-                new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int id) {
-                        dialog.dismiss();
-                    }
-                });
-
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+                .setView(view)
+                .setNegativeButton(R.string.about_close,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int id) {
+                                dialog.dismiss();
+                            }
+                        });
         return builder.create();
     }
 }

app/src/main/java/com/m2049r/xmrwallet/dialog/HelpFragment.java

@@ -16,19 +16,20 @@
 
 package com.m2049r.xmrwallet.dialog;
 
-import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentTransaction;
 import android.text.Html;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.m2049r.xmrwallet.R;
 
 public class HelpFragment extends DialogFragment {
@@ -65,15 +66,15 @@ public class HelpFragment extends DialogFragment {
         if (helpId > 0)
             ((TextView) view.findViewById(R.id.tvHelp)).setText(Html.fromHtml(getString(helpId)));
 
-        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
-        builder.setView(view);
-        builder.setNegativeButton(R.string.help_ok,
-                new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int id) {
-                        dialog.dismiss();
-                    }
-                });
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+                .setView(view)
+                .setNegativeButton(R.string.help_ok,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int id) {
+                                dialog.dismiss();
+                            }
+                        });
         return builder.create();
     }
 }