Merge pull request #954 from m2049r/feature/show_connected

show when sidekick is connected

.circleci/config.yml

@@ -3,7 +3,7 @@ jobs:
   build:
     working_directory: ~/code
     docker:
-      - image: cimg/android:2022.03-ndk
+      - image: cimg/android:2023.12-ndk
     environment:
       JVM_OPTS: -Xmx3200m
     steps:

.gitignore

@@ -8,11 +8,9 @@
 .DS_Store
 /app/build
 /app/release
-/app/alpha
+/app/alpha*
-/app/prod
+/app/prod*
-/app/alphaMainnet
-/app/prodMainnet
-/app/alphaStagenet
-/app/prodStagenet
 /app/.cxx
 /monerujo.id
+/external-libs/VERSION
+/external-libs/include/wallet2_api.h

app/build.gradle

@@ -1,15 +1,15 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 33
-    buildToolsVersion '33.0.2'
     ndkVersion '17.2.4988734'
     defaultConfig {
         applicationId "com.m2049r.xmrwallet"
+        buildToolsVersion = '35.0.0'
+        compileSdk 35
         minSdkVersion 21
-        targetSdkVersion 31
+        targetSdkVersion 35
-        versionCode 3307
+        versionCode 4006
-        versionName "3.3.7 'Pocket Change'"
+        versionName "4.0.6 'Sidekick'"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {
@@ -24,7 +24,7 @@ android {
         }
     }
 
-    flavorDimensions 'type', 'net'
+    flavorDimensions = ['type', 'net']
     productFlavors {
         mainnet {
             dimension 'net'
@@ -112,6 +112,17 @@ android {
         targetCompatibility JavaVersion.VERSION_1_8
     }
     namespace 'com.m2049r.xmrwallet'
+    buildFeatures {
+        buildConfig true
+    }
+
+    testOptions {
+        unitTests {
+            all {
+                jvmArgs '--add-opens=java.base/java.lang=ALL-UNNAMED'
+            }
+        }
+    }
 }
 
 static def getId(name) {
@@ -121,41 +132,40 @@ static def getId(name) {
 }
 
 dependencies {
-    implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))
+    implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.22"))
 
-    implementation 'androidx.core:core:1.10.1'
+    implementation 'androidx.core:core:1.13.1'
-    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'androidx.appcompat:appcompat:1.7.0'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'androidx.recyclerview:recyclerview:1.3.0'
+    implementation 'androidx.recyclerview:recyclerview:1.3.2'
     implementation 'androidx.cardview:cardview:1.0.0'
     implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    implementation 'androidx.preference:preference:1.2.0'
+    implementation 'androidx.preference:preference:1.2.1'
 
-    implementation 'com.google.android.material:material:1.9.0'
+    implementation 'com.google.android.material:material:1.12.0'
 
     implementation 'me.dm7.barcodescanner:zxing:1.9.8'
-    implementation "com.squareup.okhttp3:okhttp:4.9.3"
+    implementation "com.squareup.okhttp3:okhttp:4.12.0"
-    implementation "io.github.rburgst:okhttp-digest:2.6"
+    implementation "io.github.rburgst:okhttp-digest:3.1.0"
     implementation "com.jakewharton.timber:timber:5.0.1"
 
     implementation 'info.guardianproject.netcipher:netcipher:2.1.0'
     //implementation 'info.guardianproject.netcipher:netcipher-okhttp3:2.1.0'
     implementation fileTree(dir: 'libs/classes', include: ['*.jar'])
-    implementation 'com.nulab-inc:zxcvbn:1.5.2'
+    implementation 'com.nulab-inc:zxcvbn:1.8.2'
 
-    implementation 'dnsjava:dnsjava:2.1.9'
+    implementation 'dnsjava:dnsjava:3.5.3'
-    implementation 'org.jitsi:dnssecjava:1.2.0'
+    implementation 'org.slf4j:slf4j-nop:2.0.11'
-    implementation 'org.slf4j:slf4j-nop:1.7.36'
     implementation 'com.github.brnunes:swipeablerecyclerview:1.0.2'
 
     //noinspection GradleDependency
     testImplementation "junit:junit:4.13.2"
     testImplementation "org.mockito:mockito-all:1.10.19"
-    testImplementation "com.squareup.okhttp3:mockwebserver:4.9.3"
+    testImplementation "com.squareup.okhttp3:mockwebserver:4.12.0"
-    testImplementation 'org.json:json:20211205'
+    testImplementation 'org.json:json:20231013'
     testImplementation 'net.jodah:concurrentunit:0.4.6'
 
-    compileOnly 'org.projectlombok:lombok:1.18.22'
+    compileOnly 'org.projectlombok:lombok:1.18.30'
-    annotationProcessor 'org.projectlombok:lombok:1.18.22'
+    annotationProcessor 'org.projectlombok:lombok:1.18.30'
 }

app/src/main/AndroidManifest.xml

@@ -1,6 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-feature
+        android:name="android.hardware.camera"
+        android:required="false" />
+
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.USE_FINGERPRINT" />
@@ -8,6 +17,7 @@
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
 
     <queries>
         <intent>
@@ -94,7 +104,12 @@
             android:name=".service.WalletService"
             android:description="@string/service_description"
             android:exported="false"
-            android:label="Monero Wallet Service" />
+            android:foregroundServiceType="specialUse"
+            android:label="Monero Wallet Service">
+            <property
+                android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
+                android:value="Keeps app in sync with the blockchain" />
+        </service>
 
         <provider
             android:name="androidx.core.content.FileProvider"

app/src/main/cpp/monerujo.cpp

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2017 m2049r
+ * Copyright (c) 2017-2024 m2049r
  * <p>
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,8 +18,6 @@
 #include "monerujo.h"
 #include "wallet2_api.h"
 
-//TODO explicit casting jlong, jint, jboolean to avoid warnings
-
 #ifdef __cplusplus
 extern "C"
 {
@@ -34,7 +32,6 @@ extern "C"
 #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR  , LOG_TAG,__VA_ARGS__)
 
 static JavaVM *cachedJVM;
-static jclass class_String;
 static jclass class_ArrayList;
 static jclass class_WalletListener;
 static jclass class_CoinsInfo;
@@ -42,17 +39,11 @@ static jclass class_TransactionInfo;
 static jclass class_Transfer;
 static jclass class_Ledger;
 static jclass class_WalletStatus;
+static jclass class_BluetoothService;
+static jclass class_SidekickService;
 
 std::mutex _listenerMutex;
 
-//void jstringToString(JNIEnv *env, std::string &str, jstring jstr) {
-//    if (!jstr) return;
-//    const int len = env->GetStringUTFLength(jstr);
-//    const char *chars = env->GetStringUTFChars(jstr, nullptr);
-//    str.assign(chars, len);
-//    env->ReleaseStringUTFChars(jstr, chars);
-//}
-
 JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
     cachedJVM = jvm;
     LOGI("JNI_OnLoad");
@@ -62,8 +53,6 @@ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
     }
     //LOGI("JNI_OnLoad ok");
 
-    class_String = static_cast<jclass>(jenv->NewGlobalRef(
-            jenv->FindClass("java/lang/String")));
     class_ArrayList = static_cast<jclass>(jenv->NewGlobalRef(
             jenv->FindClass("java/util/ArrayList")));
     class_CoinsInfo = static_cast<jclass>(jenv->NewGlobalRef(
@@ -78,6 +67,8 @@ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
             jenv->FindClass("com/m2049r/xmrwallet/ledger/Ledger")));
     class_WalletStatus = static_cast<jclass>(jenv->NewGlobalRef(
             jenv->FindClass("com/m2049r/xmrwallet/model/Wallet$Status")));
+    class_BluetoothService = static_cast<jclass>(jenv->NewGlobalRef(
+            jenv->FindClass("com/m2049r/xmrwallet/service/BluetoothService")));
     return JNI_VERSION_1_6;
 }
 #ifdef __cplusplus
@@ -1686,6 +1677,79 @@ int LedgerFind(char *buffer, size_t len) {
     return ret;
 }
 
+//
+// SidekickWallet Stuff
+//
+
+/**
+ * @brief BtExchange     - exchange data with Monerujo Device
+ * @param request        - buffer for data to send
+ * @param request_len    - length of data 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, -2 if response buffer too small
+ */
+int BtExchange(
+        unsigned char *request,
+        unsigned int request_len,
+        unsigned char *response,
+        unsigned int max_resp_len) {
+    JNIEnv *jenv;
+    int envStat = attachJVM(&jenv);
+    if (envStat == JNI_ERR) return -16;
+
+    jmethodID exchangeMethod = jenv->GetStaticMethodID(class_BluetoothService, "Exchange",
+                                                       "([B)[B");
+
+    auto reqLen = static_cast<jsize>(request_len);
+    jbyteArray reqData = jenv->NewByteArray(reqLen);
+    jenv->SetByteArrayRegion(reqData, 0, reqLen, (jbyte *) request);
+    LOGD("BtExchange cmd: 0x%02x with %u bytes", request[0], reqLen);
+    auto dataRecv = (jbyteArray)
+            jenv->CallStaticObjectMethod(class_BluetoothService, exchangeMethod, reqData);
+    jenv->DeleteLocalRef(reqData);
+    if (dataRecv == nullptr) {
+        detachJVM(jenv, envStat);
+        LOGD("BtExchange: error reading");
+        return -1;
+    }
+    jsize respLen = jenv->GetArrayLength(dataRecv);
+    LOGD("BtExchange response is %u bytes", respLen);
+    if (respLen <= max_resp_len) {
+        jenv->GetByteArrayRegion(dataRecv, 0, respLen, (jbyte *) response);
+        jenv->DeleteLocalRef(dataRecv);
+        detachJVM(jenv, envStat);
+        return static_cast<int>(respLen);;
+    } else {
+        jenv->DeleteLocalRef(dataRecv);
+        detachJVM(jenv, envStat);
+        LOGE("BtExchange response buffer too small: %u < %u", respLen, max_resp_len);
+        return -2;
+    }
+}
+
+/**
+ * @brief ConfirmTransfers
+ * @param transfers - string of "fee (':' address ':' amount)+"
+ *
+ * @return true on accept, false on reject
+ */
+bool ConfirmTransfers(const char *transfers) {
+    JNIEnv *jenv;
+    int envStat = attachJVM(&jenv);
+    if (envStat == JNI_ERR) return -16;
+
+    jmethodID confirmMethod = jenv->GetStaticMethodID(class_SidekickService, "ConfirmTransfers",
+                                                      "(Ljava/lang/String;)Z");
+
+    jstring _transfers = jenv->NewStringUTF(transfers);
+    auto confirmed =
+            jenv->CallStaticBooleanMethod(class_SidekickService, confirmMethod, _transfers);
+    jenv->DeleteLocalRef(_transfers);
+    return confirmed;
+}
+
 #ifdef __cplusplus
 }
 #endif

app/src/main/cpp/monerujo.h

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2017 m2049r
+ * Copyright (c) 2017-2024 m2049r
  * <p>
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,8 @@
 
 #include <jni.h>
 
+#include <string>
+
 /*
 #include <android/log.h>
 
@@ -28,6 +30,10 @@
 #define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
 */
 
+void ThrowException(JNIEnv *jenv, const char* type, const char* msg) {
+    jenv->ThrowNew(jenv->FindClass(type), msg);
+}
+
 jfieldID getHandleField(JNIEnv *env, jobject obj, const char *fieldName = "handle") {
     jclass c = env->GetObjectClass(obj);
     return env->GetFieldID(c, fieldName, "J"); // of type long
@@ -35,8 +41,16 @@ jfieldID getHandleField(JNIEnv *env, jobject obj, const char *fieldName = "handl
 
 template<typename T>
 T *getHandle(JNIEnv *env, jobject obj, const char *fieldName = "handle") {
+    return reinterpret_cast<T *>(env->GetLongField(obj, getHandleField(env, obj, fieldName)));
+}
+
+template<typename T>
+void destroyNativeObject(JNIEnv *env, T nativeObjectHandle, jobject obj, const char *fieldName = "handle") {
     jlong handle = env->GetLongField(obj, getHandleField(env, obj, fieldName));
-    return reinterpret_cast<T *>(handle);
+    if (handle != 0) {
+        ThrowException(env, "java/lang/IllegalStateException", "invalid handle (destroy)");
+    }
+    delete reinterpret_cast<T *>(nativeObjectHandle);
 }
 
 void setHandleFromLong(JNIEnv *env, jobject obj, jlong handle) {
@@ -54,7 +68,7 @@ extern "C"
 {
 #endif
 
-extern const char* const MONERO_VERSION; // the actual monero core version
+extern const char *const MONERO_VERSION; // the actual monero core version
 
 // from monero-core crypto/hash-ops.h - avoid #including monero code here
 enum {
@@ -62,18 +76,40 @@ enum {
     HASH_DATA_AREA = 136
 };
 
-void cn_slow_hash(const void *data, size_t length, char *hash, int variant, int prehashed, uint64_t height);
+void cn_slow_hash(const void *data, size_t length, char *hash, int variant, int prehashed,
+                  uint64_t height);
 
 inline void slow_hash(const void *data, const size_t length, char *hash) {
     cn_slow_hash(data, length, hash, 0 /*variant*/, 0 /*prehashed*/, 0 /*height*/);
 }
 
 inline void slow_hash_broken(const void *data, char *hash, int variant) {
-    cn_slow_hash(data, 200 /*sizeof(union hash_state)*/, hash, variant, 1 /*prehashed*/, 0 /*height*/);
+    cn_slow_hash(data, 200 /*sizeof(union hash_state)*/, hash, variant, 1 /*prehashed*/,
+                 0 /*height*/);
 }
-
 #ifdef __cplusplus
 }
 #endif
 
+namespace Monerujo {
+    class SidekickWallet {
+    public:
+        enum Status {
+            Status_Ok,
+            Status_Error,
+            Status_Critical
+        };
+
+        SidekickWallet(uint8_t networkType, std::string a, std::string b);
+
+        ~SidekickWallet();
+
+        std::string call(int commandId, const std::string &request);
+
+        void reset();
+
+        Status status() const;
+
+    };
+}
 #endif //XMRWALLET_WALLET_LIB_H

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

@@ -16,12 +16,26 @@
 
 package com.m2049r.xmrwallet;
 
+import android.Manifest;
+import android.app.AlertDialog;
 import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.ConnectivityManager;
+import android.net.Network;
+import android.net.NetworkCapabilities;
+import android.net.NetworkInfo;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.PowerManager;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.annotation.CallSuper;
+import androidx.annotation.NonNull;
+import androidx.core.app.ActivityCompat;
 
 import com.m2049r.xmrwallet.data.BarcodeData;
 import com.m2049r.xmrwallet.dialog.ProgressDialog;
@@ -35,18 +49,13 @@ public class BaseActivity extends SecureActivity
 
     ProgressDialog progressDialog = null;
 
-    private class SimpleProgressDialog extends ProgressDialog {
+    private static class SimpleProgressDialog extends ProgressDialog {
 
         SimpleProgressDialog(Context context, int msgId) {
             super(context);
             setCancelable(false);
             setMessage(context.getString(msgId));
         }
-
-        @Override
-        public void onBackPressed() {
-            // prevent back button
-        }
     }
 
     @Override
@@ -59,13 +68,15 @@ public class BaseActivity extends SecureActivity
         progressDialog = new SimpleProgressDialog(BaseActivity.this, msgId);
         if (delayMillis > 0) {
             Handler handler = new Handler();
-            handler.postDelayed(new Runnable() {
+            handler.postDelayed(() -> {
-                public void run() {
+                if (progressDialog != null) {
-                    if (progressDialog != null) progressDialog.show();
+                    progressDialog.show();
+                    disableBackPressed();
                 }
             }, delayMillis);
         } else {
             progressDialog.show();
+            disableBackPressed();
         }
     }
 
@@ -75,6 +86,7 @@ public class BaseActivity extends SecureActivity
         progressDialog = new LedgerProgressDialog(BaseActivity.this, mode);
         Ledger.setListener((Ledger.Listener) progressDialog);
         progressDialog.show();
+        disableBackPressed();
     }
 
     @Override
@@ -87,6 +99,28 @@ public class BaseActivity extends SecureActivity
             progressDialog.dismiss();
         }
         progressDialog = null;
+        enableBackPressed();
+    }
+
+    OnBackPressedCallback backPressedCallback = new OnBackPressedCallback(false) {
+        @Override
+        public void handleOnBackPressed() {
+            // no going back
+        }
+    };
+
+    public void disableBackPressed() {
+        backPressedCallback.setEnabled(true);
+    }
+
+    public void enableBackPressed() {
+        backPressedCallback.setEnabled(false);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        getOnBackPressedDispatcher().addCallback(this, backPressedCallback);
     }
 
     static final int RELEASE_WAKE_LOCK_DELAY = 5000; // millisconds
@@ -136,4 +170,87 @@ public class BaseActivity extends SecureActivity
         barcodeData = null;
         return popped;
     }
+
+    public boolean isNetworkAvailable() {
+        ConnectivityManager connectivityManager = (ConnectivityManager) getApplication().getSystemService(Context.CONNECTIVITY_SERVICE);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            Network network = connectivityManager.getActiveNetwork();
+            if (network == null) return false;
+            NetworkCapabilities networkCapabilities = connectivityManager.getNetworkCapabilities(network);
+            return networkCapabilities != null && (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_BLUETOOTH));
+        } else {
+            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
+            return networkInfo != null && networkInfo.isConnected();
+        }
+    }
+
+    static private final int REQUEST_CODE_BLUETOOTH_PERMISSIONS = 32423;
+
+    void btPermissionGranted() {
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        if (requestCode == REQUEST_CODE_BLUETOOTH_PERMISSIONS) {
+            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
+                btPermissionGranted();
+            } // else onResume() takes care of trying again
+        }
+    }
+
+    private void showBtPermissionsDialog() {
+        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
+        alertDialogBuilder.setMessage(R.string.bluetooth_permissions);
+        alertDialogBuilder.setPositiveButton(R.string.bluetooth_permissions_ok,
+                (dialog, which) -> requestBtPermissions());
+        alertDialogBuilder.setCancelable(false);
+        AlertDialog alertDialog = alertDialogBuilder.create();
+        alertDialog.show();
+    }
+
+    private void showAppInfoDialog() {
+        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
+        alertDialogBuilder.setMessage(R.string.bluetooth_permissions);
+        alertDialogBuilder.setPositiveButton(R.string.bluetooth_permissions_settings, (dialog, which) -> {
+            Intent i = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+            i.addCategory(Intent.CATEGORY_DEFAULT);
+            i.setData(Uri.parse("package:" + getPackageName()));
+            startActivity(i);
+        });
+        alertDialogBuilder.setNegativeButton(R.string.bluetooth_permissions_cancel, (dialog, which) -> {
+            finish();
+        });
+        alertDialogBuilder.setCancelable(false);
+        AlertDialog alertDialog = alertDialogBuilder.create();
+        alertDialog.show();
+    }
+
+    private void requestBtPermissions() {
+        ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.BLUETOOTH_CONNECT, android.Manifest.permission.BLUETOOTH_SCAN}, REQUEST_CODE_BLUETOOTH_PERMISSIONS);
+    }
+
+    private boolean firstCheck = true;
+
+    void checkBtPermissions() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+            if ((ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) ||
+                    (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_SCAN) != PackageManager.PERMISSION_GRANTED)) {
+                if (shouldShowRequestPermissionRationale(android.Manifest.permission.BLUETOOTH_SCAN) || shouldShowRequestPermissionRationale(Manifest.permission.BLUETOOTH_CONNECT)) {
+                    showBtPermissionsDialog();
+                } else {
+                    if (firstCheck) {
+                        requestBtPermissions();
+                    } else {
+                        showAppInfoDialog();
+                    }
+                }
+            } else {
+                btPermissionGranted();
+            }
+            firstCheck = false;
+        } else {
+            btPermissionGranted();
+        }
+    }
 }

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

@@ -18,7 +18,6 @@ package com.m2049r.xmrwallet;
 
 import android.app.Activity;
 import android.content.Context;
-import android.content.DialogInterface;
 import android.os.Bundle;
 import android.text.Editable;
 import android.text.Html;
@@ -67,8 +66,20 @@ public class GenerateFragment extends Fragment {
     static final String TYPE_KEY = "key";
     static final String TYPE_SEED = "seed";
     static final String TYPE_LEDGER = "ledger";
+    static final String TYPE_SIDEKICK = "sidekick";
     static final String TYPE_VIEWONLY = "view";
 
+    static Wallet.Device getDeviceType(String type) {
+        switch (type) {
+            case TYPE_SIDEKICK:
+                return Wallet.Device.Sidekick;
+            case TYPE_LEDGER:
+                return Wallet.Device.Ledger;
+            default:
+                return Wallet.Device.Software;
+        }
+    }
+
     private TextInputLayout etWalletName;
     private PasswordEntryView etWalletPassword;
     private LinearLayout llFingerprintAuth;
@@ -195,6 +206,7 @@ public class GenerateFragment extends Fragment {
                 etWalletPassword.getEditText().setImeOptions(EditorInfo.IME_ACTION_UNSPECIFIED);
                 break;
             case TYPE_LEDGER:
+            case TYPE_SIDEKICK:
                 etWalletPassword.getEditText().setImeOptions(EditorInfo.IME_ACTION_DONE);
                 etWalletPassword.getEditText().setOnEditorActionListener((v, actionId, event) -> {
                     if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
@@ -308,7 +320,7 @@ public class GenerateFragment extends Fragment {
     private boolean checkName() {
         String name = etWalletName.getEditText().getText().toString();
         boolean ok = true;
-        if (name.length() == 0) {
+        if (name.isEmpty()) {
             etWalletName.setError(getString(R.string.generate_wallet_name));
             ok = false;
         } else if (name.charAt(0) == '.') {
@@ -450,11 +462,12 @@ public class GenerateFragment extends Fragment {
                 activityCallback.onGenerate(name, crazyPass, seed, offset, height);
                 break;
             case TYPE_LEDGER:
+            case TYPE_SIDEKICK:
                 bGenerate.setEnabled(false);
                 if (fingerprintAuthAllowed) {
                     KeyStoreHelper.saveWalletUserPass(requireActivity(), name, password);
                 }
-                activityCallback.onGenerateLedger(name, crazyPass, height);
+                activityCallback.onGenerateDevice(getDeviceType(type), name, crazyPass, height);
                 break;
             case TYPE_KEY:
             case TYPE_VIEWONLY:
@@ -498,6 +511,8 @@ public class GenerateFragment extends Fragment {
                 return getString(R.string.generate_wallet_type_seed);
             case TYPE_LEDGER:
                 return getString(R.string.generate_wallet_type_ledger);
+            case TYPE_SIDEKICK:
+                return getString(R.string.generate_wallet_type_sidekick);
             case TYPE_VIEWONLY:
                 return getString(R.string.generate_wallet_type_view);
             default:
@@ -515,7 +530,7 @@ public class GenerateFragment extends Fragment {
 
         void onGenerate(String name, String password, String address, String viewKey, String spendKey, long height);
 
-        void onGenerateLedger(String name, String password, long height);
+        void onGenerateDevice(Wallet.Device device, String name, String password, long height);
 
         void setTitle(String title);
 
@@ -555,6 +570,9 @@ public class GenerateFragment extends Fragment {
             case TYPE_LEDGER:
                 inflater.inflate(R.menu.create_wallet_ledger, menu);
                 break;
+            case TYPE_SIDEKICK:
+                inflater.inflate(R.menu.create_wallet_sidekick, menu);
+                break;
             case TYPE_VIEWONLY:
                 inflater.inflate(R.menu.create_wallet_view, menu);
                 break;
@@ -581,13 +599,11 @@ public class GenerateFragment extends Fragment {
                 .setCancelable(false)
                 .setPositiveButton(getString(R.string.label_ok), null)
                 .setNegativeButton(getString(R.string.label_cancel),
-                        new DialogInterface.OnClickListener() {
+                        (dialog, id) -> {
-                            public void onClick(DialogInterface dialog, int id) {
+                            Helper.hideKeyboardAlways(activity);
-                                Helper.hideKeyboardAlways(activity);
+                            etWalletMnemonic.getEditText().getText().clear();
-                                etWalletMnemonic.getEditText().getText().clear();
+                            dialog.cancel();
-                                dialog.cancel();
+                            ledgerDialog = null;
-                                ledgerDialog = null;
-                            }
                         });
 
         ledgerDialog = alertDialogBuilder.create();

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

@@ -40,6 +40,7 @@ import android.widget.ScrollView;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
@@ -98,6 +99,13 @@ public class GenerateReviewFragment extends Fragment {
     private String walletPath;
     private String walletName;
 
+    private OnBackPressedCallback backPressedCallback = new OnBackPressedCallback(false) {
+        @Override
+        public void handleOnBackPressed() {
+            // nothing
+        }
+    };
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -160,6 +168,9 @@ public class GenerateReviewFragment extends Fragment {
         walletPath = args.getString(REQUEST_PATH);
         localPassword = args.getString(REQUEST_PASSWORD);
         showDetails();
+        if (type.equals(GenerateReviewFragment.VIEW_TYPE_ACCEPT)) {
+            backPressedCallback.setEnabled(true);
+        }
         return view;
     }
 
@@ -243,7 +254,7 @@ public class GenerateReviewFragment extends Fragment {
             showProgress();
             if ((walletPath != null)
                     && (WalletManager.getInstance().queryWalletDevice(walletPath + ".keys", getPassword())
-                    == Wallet.Device.Device_Ledger)
+                    == Wallet.Device.Ledger)
                     && (progressCallback != null)) {
                 progressCallback.showLedgerProgressDialog(LedgerProgressDialog.TYPE_RESTORE);
                 dialogOpened = true;
@@ -275,10 +286,11 @@ public class GenerateReviewFragment extends Fragment {
             height = wallet.getRestoreHeight();
             seed = wallet.getSeed(getSeedOffset());
             switch (wallet.getDeviceType()) {
-                case Device_Ledger:
+                case Ledger:
                     viewKey = Ledger.Key();
                     break;
-                case Device_Software:
+                case Software:
+                case Sidekick:
                     viewKey = wallet.getSecretViewKey();
                     break;
                 default:
@@ -420,14 +432,11 @@ public class GenerateReviewFragment extends Fragment {
         pbProgress.setVisibility(View.INVISIBLE);
     }
 
-    boolean backOk() {
-        return !type.equals(GenerateReviewFragment.VIEW_TYPE_ACCEPT);
-    }
-
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setHasOptionsMenu(true);
+        requireActivity().getOnBackPressedDispatcher().addCallback(this, backPressedCallback);
     }
 
     @Override

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

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2024 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.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+
+import androidx.fragment.app.Fragment;
+
+import timber.log.Timber;
+
+public class LockFragment extends Fragment {
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        Timber.d("onCreateView");
+        final FrameLayout frame = new FrameLayout(requireContext());
+        frame.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
+        return frame;
+    }
+}

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

@@ -35,6 +35,7 @@ import android.widget.RelativeLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
@@ -45,6 +46,7 @@ import com.google.android.material.progressindicator.CircularProgressIndicator;
 import com.m2049r.xmrwallet.data.NodeInfo;
 import com.m2049r.xmrwallet.dialog.HelpFragment;
 import com.m2049r.xmrwallet.layout.WalletInfoAdapter;
+import com.m2049r.xmrwallet.model.Wallet;
 import com.m2049r.xmrwallet.model.WalletManager;
 import com.m2049r.xmrwallet.util.Helper;
 import com.m2049r.xmrwallet.util.KeyStoreHelper;
@@ -60,6 +62,7 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 
+import lombok.Getter;
 import timber.log.Timber;
 
 public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInteractionListener,
@@ -114,7 +117,9 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
 
         Set<NodeInfo> getOrPopulateFavourites();
 
-        boolean hasLedger();
+        boolean hasDevice(Wallet.Device type);
+
+        boolean isNetworkAvailable();
 
         void runOnNetCipher(Runnable runnable);
     }
@@ -145,9 +150,15 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         activityCallback.setToolbarButton(Toolbar.BUTTON_SETTINGS);
         activityCallback.showNet();
         showNetwork();
-        //activityCallback.runOnNetCipher(this::pingSelectedNode);
     }
 
+    private OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(false) {
+        @Override
+        public void handleOnBackPressed() {
+            animateFAB();
+        }
+    };
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -164,6 +175,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         fabSeed = view.findViewById(R.id.fabSeed);
         fabImport = view.findViewById(R.id.fabImport);
         fabLedger = view.findViewById(R.id.fabLedger);
+        fabSidekick = view.findViewById(R.id.fabSidekick);
 
         fabNewL = view.findViewById(R.id.fabNewL);
         fabViewL = view.findViewById(R.id.fabViewL);
@@ -171,6 +183,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         fabSeedL = view.findViewById(R.id.fabSeedL);
         fabImportL = view.findViewById(R.id.fabImportL);
         fabLedgerL = view.findViewById(R.id.fabLedgerL);
+        fabSidekickL = view.findViewById(R.id.fabSidekickL);
 
         fab_pulse = AnimationUtils.loadAnimation(getContext(), R.anim.fab_pulse);
         fab_open_screen = AnimationUtils.loadAnimation(getContext(), R.anim.fab_open_screen);
@@ -186,6 +199,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         fabSeed.setOnClickListener(this);
         fabImport.setOnClickListener(this);
         fabLedger.setOnClickListener(this);
+        fabSidekick.setOnClickListener(this);
         fabScreen.setOnClickListener(this);
 
         RecyclerView recyclerView = view.findViewById(R.id.list);
@@ -194,6 +208,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         recyclerView.setAdapter(adapter);
 
         ViewGroup llNotice = view.findViewById(R.id.llNotice);
+
         Notice.showAll(llNotice, ".*_login");
 
         view.findViewById(R.id.llNode).setOnClickListener(v -> startNodePrefs());
@@ -287,6 +302,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setHasOptionsMenu(true);
+        requireActivity().getOnBackPressedDispatcher().addCallback(this, onBackPressedCallback);
     }
 
     @Override
@@ -295,25 +311,30 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         super.onCreateOptionsMenu(menu, inflater);
     }
 
-    private boolean isFabOpen = false;
+    @Getter
-    private FloatingActionButton fab, fabNew, fabView, fabKey, fabSeed, fabImport, fabLedger;
+    private boolean fabOpen = false;
+    private FloatingActionButton fab, fabNew, fabView, fabKey, fabSeed, fabImport, fabLedger, fabSidekick;
     private RelativeLayout fabScreen;
-    private RelativeLayout fabNewL, fabViewL, fabKeyL, fabSeedL, fabImportL, fabLedgerL;
+    private RelativeLayout fabNewL, fabViewL, fabKeyL, fabSeedL, fabImportL, fabLedgerL, fabSidekickL;
     private Animation fab_open, fab_close, rotate_forward, rotate_backward, fab_open_screen, fab_close_screen;
     private Animation fab_pulse;
 
-    public boolean isFabOpen() {
+    private void setFabOpen(boolean value) {
-        return isFabOpen;
+        fabOpen = value;
+        onBackPressedCallback.setEnabled(value);
     }
 
     public void animateFAB() {
-        if (isFabOpen) { // close the fab
+        if (isFabOpen()) { // close the fab
             fabScreen.setClickable(false);
             fabScreen.startAnimation(fab_close_screen);
             fab.startAnimation(rotate_backward);
             if (fabLedgerL.getVisibility() == View.VISIBLE) {
                 fabLedgerL.startAnimation(fab_close);
                 fabLedger.setClickable(false);
+            } else if (fabSidekickL.getVisibility() == View.VISIBLE) {
+                fabSidekickL.startAnimation(fab_close);
+                fabSidekick.setClickable(false);
             } else {
                 fabNewL.startAnimation(fab_close);
                 fabNew.setClickable(false);
@@ -326,22 +347,30 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
                 fabImportL.startAnimation(fab_close);
                 fabImport.setClickable(false);
             }
-            isFabOpen = false;
+            setFabOpen(false);
         } else { // open the fab
             fabScreen.setClickable(true);
             fabScreen.startAnimation(fab_open_screen);
             fab.startAnimation(rotate_forward);
-            if (activityCallback.hasLedger()) {
+            if ((activityCallback.hasDevice(Wallet.Device.Ledger)
-                fabLedgerL.setVisibility(View.VISIBLE);
+                    || activityCallback.hasDevice(Wallet.Device.Sidekick))) {
                 fabNewL.setVisibility(View.GONE);
                 fabViewL.setVisibility(View.GONE);
                 fabKeyL.setVisibility(View.GONE);
                 fabSeedL.setVisibility(View.GONE);
                 fabImportL.setVisibility(View.GONE);
 
-                fabLedgerL.startAnimation(fab_open);
+                if (activityCallback.hasDevice(Wallet.Device.Ledger)) {
-                fabLedger.setClickable(true);
+                    fabLedgerL.setVisibility(View.VISIBLE);
+                    fabLedgerL.startAnimation(fab_open);
+                    fabLedger.setClickable(true);
+                } else { // Sidekick
+                    fabSidekickL.setVisibility(View.VISIBLE);
+                    fabSidekickL.startAnimation(fab_open);
+                    fabSidekick.setClickable(true);
+                }
             } else {
+                fabSidekickL.setVisibility(View.GONE);
                 fabLedgerL.setVisibility(View.GONE);
                 fabNewL.setVisibility(View.VISIBLE);
                 fabViewL.setVisibility(View.VISIBLE);
@@ -360,7 +389,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
                 fabImportL.startAnimation(fab_open);
                 fabImport.setClickable(true);
             }
-            isFabOpen = true;
+            setFabOpen(true);
         }
     }
 
@@ -372,7 +401,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
             animateFAB();
         } else if (id == R.id.fabNew) {
             fabScreen.setVisibility(View.INVISIBLE);
-            isFabOpen = false;
+            setFabOpen(false);
             activityCallback.onAddWallet(GenerateFragment.TYPE_NEW);
         } else if (id == R.id.fabView) {
             animateFAB();
@@ -390,6 +419,10 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
             Timber.d("FAB_LEDGER");
             animateFAB();
             activityCallback.onAddWallet(GenerateFragment.TYPE_LEDGER);
+        } else if (id == R.id.fabSidekick) {
+            Timber.d("FAB_SIDEKICK");
+            animateFAB();
+            activityCallback.onAddWallet(GenerateFragment.TYPE_SIDEKICK);
         } else if (id == R.id.fabScreen) {
             animateFAB();
         }

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

@@ -31,6 +31,7 @@ import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.Fragment;
@@ -145,6 +146,13 @@ public class NodeFragment extends Fragment
         }
     }
 
+    private OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(false) {
+        @Override
+        public void handleOnBackPressed() {
+            Toast.makeText(requireActivity(), getString(R.string.node_refresh_wait), Toast.LENGTH_LONG).show();
+        }
+    };
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -187,6 +195,7 @@ public class NodeFragment extends Fragment
 
     private boolean refresh(int type) {
         if (asyncFindNodes != null) return false; // ignore refresh request as one is ongoing
+        onBackPressedCallback.setEnabled(true);
         asyncFindNodes = new AsyncFindNodes();
         updateRefreshElements();
         asyncFindNodes.execute(type);
@@ -197,6 +206,7 @@ public class NodeFragment extends Fragment
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setHasOptionsMenu(true);
+        requireActivity().getOnBackPressedDispatcher().addCallback(this, onBackPressedCallback);
     }
 
     @Override
@@ -342,6 +352,7 @@ public class NodeFragment extends Fragment
 
         private void complete() {
             asyncFindNodes = null;
+            onBackPressedCallback.setEnabled(false);
             if (!isAdded()) return;
             //if (isCancelled()) return;
             tvPull.setText(getString(R.string.node_pull_hint));
@@ -575,6 +586,7 @@ public class NodeFragment extends Fragment
                 }
             }
         }
+
     }
 
     void restoreDefaultNodes() {

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

@@ -1,21 +0,0 @@
-/*
- * Copyright (c) 2017 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;
-
-public interface OnBackPressedListener {
-    boolean onBackPressed();
-}

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

@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2018 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.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothClass;
+import android.bluetooth.BluetoothDevice;
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
+
+import com.m2049r.xmrwallet.data.BluetoothInfo;
+import com.m2049r.xmrwallet.layout.BluetoothInfoAdapter;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import timber.log.Timber;
+
+public class SidekickConnectFragment extends Fragment
+        implements BluetoothInfoAdapter.OnInteractionListener {
+
+    private BluetoothAdapter bluetoothAdapter;
+
+    private SwipeRefreshLayout pullToRefresh;
+
+    private BluetoothInfoAdapter infoAdapter;
+
+    private Listener activityCallback;
+
+    public interface Listener {
+        void setToolbarButton(int type);
+
+        void setSubtitle(String title);
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            this.activityCallback = (Listener) context;
+        } else {
+            throw new ClassCastException(context + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onPause() {
+        Timber.d("onPause()");
+        if (bluetoothAdapter.isDiscovering()) {
+            bluetoothAdapter.cancelDiscovery();
+        }
+        // the the activity we are connected? why? it can ask the bluetoothservice...
+        super.onPause();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activityCallback.setSubtitle(getString(R.string.label_bluetooth));
+        activityCallback.setToolbarButton(Toolbar.BUTTON_BACK);
+        final BluetoothFragment btFragment = (BluetoothFragment) getChildFragmentManager().findFragmentById(R.id.bt_fragment);
+        assert btFragment != null;
+        btFragment.start();
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        Timber.d("onCreateView");
+        View view = inflater.inflate(R.layout.fragment_sidekick_connect, container, false);
+
+        RecyclerView recyclerView = view.findViewById(R.id.list);
+        infoAdapter = new BluetoothInfoAdapter(this);
+        recyclerView.setAdapter(infoAdapter);
+
+        pullToRefresh = view.findViewById(R.id.pullToRefresh);
+        pullToRefresh.setOnRefreshListener(() -> {
+            populateList();
+            pullToRefresh.setRefreshing(false);
+        });
+
+        return view;
+    }
+
+    private void populateList() {
+        List<BluetoothInfo> items = new ArrayList<>();
+        for (BluetoothDevice device : bluetoothAdapter.getBondedDevices()) {
+            final int deviceCLass = device.getBluetoothClass().getDeviceClass();
+            switch (deviceCLass) {
+                case BluetoothClass.Device.PHONE_SMART:
+                    //TODO verify these are correct
+                case BluetoothClass.Device.COMPUTER_HANDHELD_PC_PDA:
+                case BluetoothClass.Device.COMPUTER_PALM_SIZE_PC_PDA:
+                    items.add(new BluetoothInfo(device));
+            }
+        }
+        infoAdapter.setItems(items);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        Helper.hideKeyboard(getActivity());
+
+        // Get the local Bluetooth adapter
+        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+        populateList();
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(@NonNull Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.sidekick_connect_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+
+        // Make sure we're not doing discovery anymore
+        if (bluetoothAdapter != null) {
+            bluetoothAdapter.cancelDiscovery();
+        }
+    }
+
+    @Override
+    public void onInteraction(final View view, final BluetoothInfo item) {
+        Timber.d("onInteraction %s", item);
+        bluetoothAdapter.cancelDiscovery();
+
+        final BluetoothFragment btFragment = (BluetoothFragment) getChildFragmentManager().findFragmentById(R.id.bt_fragment);
+        assert btFragment != null;
+        btFragment.connectDevice(item.getAddress());
+    }
+
+    public void allowClick() {
+        infoAdapter.allowClick(true);
+    }
+}

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

@@ -195,7 +195,7 @@ public class SubaddressFragment extends Fragment implements SubaddressInfoAdapte
         @Override
         protected void onPreExecute() {
             super.onPreExecute();
-            if ((wallet.getDeviceType() == Wallet.Device.Device_Ledger) && (progressCallback != null)) {
+            if ((wallet.getDeviceType() == Wallet.Device.Ledger) && (progressCallback != null)) {
                 progressCallback.showLedgerProgressDialog(LedgerProgressDialog.TYPE_SUBADDRESS);
                 dialogOpened = true;
             }

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

@@ -22,8 +22,8 @@ import android.content.res.Configuration;
 import android.os.Build;
 
 import androidx.annotation.NonNull;
-import androidx.fragment.app.FragmentManager;
 
+import com.m2049r.xmrwallet.BuildConfig;
 import com.m2049r.xmrwallet.model.NetworkType;
 import com.m2049r.xmrwallet.util.LocaleHelper;
 import com.m2049r.xmrwallet.util.NetCipherHelper;
@@ -36,7 +36,6 @@ public class XmrWalletApplication extends Application {
     @Override
     public void onCreate() {
         super.onCreate();
-        FragmentManager.enableNewStateManager(false);
         if (BuildConfig.DEBUG) {
             Timber.plant(new Timber.DebugTree());
         }

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

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018 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.data;
+
+import android.bluetooth.BluetoothDevice;
+
+import java.util.Comparator;
+
+import lombok.Data;
+import lombok.Getter;
+
+@Data
+public class BluetoothInfo {
+    @Getter
+    final private String name;
+    @Getter
+    final private String address;
+    @Getter
+    private boolean bonded;
+
+    public BluetoothInfo(BluetoothDevice device) {
+        name = device.getName().trim();
+        address = device.getAddress();
+        bonded = device.getBondState() == BluetoothDevice.BOND_BONDED;
+    }
+
+    static public Comparator<BluetoothInfo> NameComparator = (o1, o2) -> o1.name.compareTo(o2.name);
+}

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

@@ -29,10 +29,12 @@ public enum DefaultNodes {
     HASHVAULT("nodes.hashvault.pro:18081"),
     MONEROWORLD("node.moneroworld.com:18089"),
     XMRTW("opennode.xmr-tw.org:18089"),
+    ds_jetzt("monero.ds-jetzt.de:18089"),
     MONERUJO_ONION("monerujods7mbghwe6cobdr6ujih6c22zu5rl7zshmizz2udf7v7fsad.onion:18081/mainnet/monerujo.onion"),
     Criminales78("56wl7y2ebhamkkiza4b7il4mrzwtyvpdym7bm2bkg3jrei2je646k3qd.onion:18089/mainnet/Criminales78.onion"),
     xmrfail("mxcd4577fldb3ppzy7obmmhnu3tf57gbcbd4qhwr2kxyjj2qi3dnbfqd.onion:18081/mainnet/xmrfail.onion"),
-    boldsuck("6dsdenp6vjkvqzy4wzsnzn6wixkdzihx3khiumyzieauxuxslmcaeiad.onion:18081/mainnet/boldsuck.onion");
+    boldsuck("6dsdenp6vjkvqzy4wzsnzn6wixkdzihx3khiumyzieauxuxslmcaeiad.onion:18081/mainnet/boldsuck.onion"),
+    ds_jetzt_onion("qvlr4w7yhnjrdg3txa72jwtpnjn4ezsrivzvocbnvpfbdo342fahhoad.onion:18089/mainnet/ds-jetzt.onion");
 
     @Getter
     private final String uri;

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

@@ -26,6 +26,7 @@ import com.m2049r.xmrwallet.model.Wallet;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Random;
 import java.util.Set;
 
 import lombok.Data;
@@ -136,8 +137,9 @@ public class TxData implements Parcelable {
     //////////////////////////
 
     final static public int POCKETCHANGE_IDX = 1; // subaddress index of first pocketchange slot
-    final static public int POCKETCHANGE_SLOTS = 10; // number of pocketchange slots
+    final static public int POCKETCHANGE_SLOTS_MIN = 6;  // min number of pocketchange slots
-    final static public int POCKETCHANGE_IDX_MAX = POCKETCHANGE_IDX + POCKETCHANGE_SLOTS - 1;
+    final static public int POCKETCHANGE_SLOTS_MAX = 14; // max number of pocketchange slots
+    final static public int POCKETCHANGE_IDX_MAX = POCKETCHANGE_IDX + POCKETCHANGE_SLOTS_MAX - 1;
 
     @Data
     static private class PocketChangeSlot {
@@ -171,8 +173,8 @@ public class TxData implements Parcelable {
         List<CoinsInfo> coins = wallet.getCoinsInfos(true);
         Set<Integer> spendableSubaddressIdx = new HashSet<>();
         PocketChangeSlot reserves = new PocketChangeSlot(); // everything not in a slot spendable
-        PocketChangeSlot[] slots = new PocketChangeSlot[POCKETCHANGE_SLOTS];
+        PocketChangeSlot[] slots = new PocketChangeSlot[POCKETCHANGE_SLOTS_MAX];
-        for (int i = 0; i < POCKETCHANGE_SLOTS; i++) {
+        for (int i = 0; i < POCKETCHANGE_SLOTS_MAX; i++) {
             slots[i] = new PocketChangeSlot();
         }
         for (CoinsInfo coin : coins) {
@@ -205,7 +207,8 @@ public class TxData implements Parcelable {
         // find any slots to fill if possible:
         List<Integer> slotsToFill = new ArrayList<>();
         List<Long> slotToFillAmounts = new ArrayList<>();
-        for (int i = 0; i < POCKETCHANGE_SLOTS; i++) {
+        final int randomSlotCount = new Random().nextInt(POCKETCHANGE_SLOTS_MAX - POCKETCHANGE_SLOTS_MIN + 1) + POCKETCHANGE_SLOTS_MIN;
+        for (int i = 0; i < randomSlotCount; i++) {
             if (slots[i].getAmount() < pocketChangeAmount) {
                 final long topupAmount = pocketChangeAmount - slots[i].getAmount();
                 if (topupAmount <= spendableAmount) {

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendBtcConfirmWizardFragment.java

@@ -74,6 +74,9 @@ public class SendBtcConfirmWizardFragment extends SendWizardFragment implements
     private View llConfirmSend;
     private Button bSend;
     private View pbProgressSend;
+    private TextView tvTxChange;
+    private View llPocketChange;
+
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
@@ -92,6 +95,8 @@ public class SendBtcConfirmWizardFragment extends SendWizardFragment implements
 
         tvTxFee = view.findViewById(R.id.tvTxFee);
         tvTxTotal = view.findViewById(R.id.tvTxTotal);
+        tvTxChange = view.findViewById(R.id.tvTxChange);
+        llPocketChange = view.findViewById(R.id.llPocketChange);
 
         llStageA = view.findViewById(R.id.llStageA);
         evStageA = view.findViewById(R.id.evStageA);
@@ -217,6 +222,13 @@ public class SendBtcConfirmWizardFragment extends SendWizardFragment implements
                 tvTxFee.setText(Wallet.getDisplayAmount(pendingTransaction.getFee()));
                 tvTxTotal.setText(Wallet.getDisplayAmount(
                         pendingTransaction.getFee() + pendingTransaction.getAmount()));
+                final long change = pendingTransaction.getPocketChange();
+                if (change > 0) {
+                    llPocketChange.setVisibility(View.VISIBLE);
+                    tvTxChange.setText(Wallet.getDisplayAmount(change));
+                } else {
+                    llPocketChange.setVisibility(View.GONE);
+                }
                 updateSendButton();
             });
         } else {

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendFragment.java

@@ -29,6 +29,7 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.EditText;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
@@ -37,7 +38,6 @@ import androidx.fragment.app.FragmentStatePagerAdapter;
 import androidx.viewpager.widget.ViewPager;
 
 import com.google.android.material.transition.MaterialContainerTransform;
-import com.m2049r.xmrwallet.OnBackPressedListener;
 import com.m2049r.xmrwallet.OnUriScannedListener;
 import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.WalletActivity;
@@ -63,7 +63,7 @@ public class SendFragment extends Fragment
         SendAmountWizardFragment.Listener,
         SendConfirmWizardFragment.Listener,
         SendSuccessWizardFragment.Listener,
-        OnBackPressedListener, OnUriScannedListener {
+        OnUriScannedListener {
 
     final static public int MIXIN = 0;
 
@@ -248,16 +248,18 @@ public class SendFragment extends Fragment
     private SpendViewPager spendViewPager;
     private SpendPagerAdapter pagerAdapter;
 
-    @Override
+    OnBackPressedCallback backPressedCallback = new OnBackPressedCallback(true) {
-    public boolean onBackPressed() {
+        @Override
-        if (isComitted()) return true; // no going back
+        public void handleOnBackPressed() {
-        if (spendViewPager.getCurrentItem() == 0) {
+            if (isComitted()) return; // no going back
-            return false;
+            if (spendViewPager.getCurrentItem() == 0) {
-        } else {
+                setEnabled(false);
-            spendViewPager.previous();
+                requireActivity().getOnBackPressedDispatcher().onBackPressed();
-            return true;
+            } else {
+                spendViewPager.previous();
+            }
         }
-    }
+    };
 
     @Override
     public boolean onUriScanned(BarcodeData barcodeData) {
@@ -546,8 +548,9 @@ public class SendFragment extends Fragment
         final MaterialContainerTransform transform = new MaterialContainerTransform();
         transform.setDrawingViewId(R.id.fragment_container);
         transform.setDuration(getResources().getInteger(R.integer.tx_item_transition_duration));
-        transform.setAllContainerColors(ThemeHelper.getThemedColor(getContext(), android.R.attr.colorBackground));
+        transform.setAllContainerColors(ThemeHelper.getThemedColor(requireContext(), android.R.attr.colorBackground));
         setSharedElementEnterTransition(transform);
+        requireActivity().getOnBackPressedDispatcher().addCallback(this, backPressedCallback);
     }
 
     @Override

app/src/main/java/com/m2049r/xmrwallet/layout/BluetoothInfoAdapter.java

@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2018 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.layout;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.BluetoothInfo;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+public class BluetoothInfoAdapter extends RecyclerView.Adapter<BluetoothInfoAdapter.ViewHolder> {
+
+    public interface OnInteractionListener {
+        void onInteraction(View view, BluetoothInfo item);
+    }
+
+    private final List<BluetoothInfo> items = new ArrayList<>();
+    private final OnInteractionListener listener;
+
+    public BluetoothInfoAdapter(OnInteractionListener listener) {
+        this.listener = listener;
+    }
+
+    private static class BluetoothInfoDiff extends DiffCallback<BluetoothInfo> {
+
+        public BluetoothInfoDiff(List<BluetoothInfo> oldList, List<BluetoothInfo> newList) {
+            super(oldList, newList);
+        }
+
+        @Override
+        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
+            return mOldList.get(oldItemPosition).getAddress().equals(mNewList.get(newItemPosition).getAddress());
+        }
+
+        @Override
+        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
+            final BluetoothInfo oldItem = mOldList.get(oldItemPosition);
+            final BluetoothInfo newItem = mNewList.get(newItemPosition);
+            return oldItem.equals(newItem);
+        }
+    }
+
+    @Override
+    public @NonNull
+    ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_bluetooth, parent, false);
+        return new ViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(final @NonNull ViewHolder holder, int position) {
+        holder.bind(position);
+    }
+
+    @Override
+    public int getItemCount() {
+        return items.size();
+    }
+
+    public void add(BluetoothInfo item) {
+        if (item == null) return;
+        List<BluetoothInfo> newItems = new ArrayList<>(items);
+        if (!items.contains(item))
+            newItems.add(item);
+        setItems(newItems); // in case the nodeinfo has changed
+    }
+
+    public void setItems(Collection<BluetoothInfo> newItemsCollection) {
+        List<BluetoothInfo> newItems;
+        if (newItemsCollection != null) {
+            newItems = new ArrayList<>(newItemsCollection);
+            Collections.sort(newItems, BluetoothInfo.NameComparator);
+        } else {
+            newItems = new ArrayList<>();
+        }
+        final BluetoothInfoAdapter.BluetoothInfoDiff diffCallback = new BluetoothInfoAdapter.BluetoothInfoDiff(items, newItems);
+        final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
+        items.clear();
+        items.addAll(newItems);
+        diffResult.dispatchUpdatesTo(this);
+    }
+
+    private boolean itemsClickable = true;
+
+    public void allowClick(boolean clickable) {
+        itemsClickable = clickable;
+        notifyDataSetChanged();
+    }
+
+    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
+        final TextView tvName;
+        final TextView tvAddress;
+        BluetoothInfo item;
+
+        ViewHolder(View itemView) {
+            super(itemView);
+            tvName = itemView.findViewById(R.id.tvName);
+            tvAddress = itemView.findViewById(R.id.tvAddress);
+            itemView.setOnClickListener(this);
+        }
+
+        void bind(int position) {
+            item = items.get(position);
+            tvName.setText(item.getName());
+            tvAddress.setText(item.getAddress());
+            itemView.setClickable(itemsClickable);
+            itemView.setEnabled(itemsClickable);
+        }
+
+        @Override
+        public void onClick(View view) {
+            if (listener != null) {
+                int position = getBindingAdapterPosition(); // gets item position
+                if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
+                    final BluetoothInfo node = items.get(position);
+                    allowClick(false);
+                    listener.onInteraction(view, node);
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/layout/TransactionInfoAdapter.java

@@ -86,7 +86,7 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
     }
 
     public boolean needsTransactionUpdateOnNewBlock() {
-        return (infoItems.size() > 0) && !infoItems.get(0).isConfirmed();
+        return (!infoItems.isEmpty()) && !infoItems.get(0).isConfirmed();
     }
 
     private static class TransactionInfoDiff extends DiffCallback<TransactionInfo> {

app/src/main/java/com/m2049r/xmrwallet/ledger/Hardware.java

@@ -0,0 +1,4 @@
+package com.m2049r.xmrwallet.ledger;
+
+public interface Hardware {
+}

app/src/main/java/com/m2049r/xmrwallet/ledger/Ledger.java

@@ -35,12 +35,11 @@ import java.nio.charset.StandardCharsets;
 
 import timber.log.Timber;
 
-public class Ledger {
+public class Ledger implements Hardware {
     static final public boolean ENABLED = true;
     // 5:20 is same as wallet2.cpp::restore()
     static public final int LOOKAHEAD_ACCOUNTS = 5;
     static public final int LOOKAHEAD_SUBADDRESSES = 20;
-    static public final String SUBADDRESS_LOOKAHEAD = LOOKAHEAD_ACCOUNTS + ":" + LOOKAHEAD_SUBADDRESSES;
 
     private static final byte PROTOCOL_VERSION = 0x03;
     public static final int SW_OK = 0x9000;

app/src/main/java/com/m2049r/xmrwallet/ledger/LedgerProgressDialog.java

@@ -46,11 +46,6 @@ public class LedgerProgressDialog extends ProgressDialog implements Ledger.Liste
             setMessage(context.getString(R.string.progress_ledger_progress));
     }
 
-    @Override
-    public void onBackPressed() {
-        // prevent back button
-    }
-
     private int firstSubaddress = Integer.MAX_VALUE;
 
     private boolean validate = false;

app/src/main/java/com/m2049r/xmrwallet/model/Wallet.java

@@ -111,7 +111,11 @@ public class Wallet {
     @RequiredArgsConstructor
     @Getter
     public enum Device {
-        Device_Undefined(0, 0), Device_Software(50, 200), Device_Ledger(5, 20);
+        Undefined(0, 0),
+        Software(50, 200),
+        Ledger(5, 20),
+        Trezor(5, 20),
+        Sidekick(5, 20);
         private final int accountLookahead;
         private final int subaddressLookahead;
     }

app/src/main/java/com/m2049r/xmrwallet/model/WalletManager.java

@@ -18,7 +18,6 @@ package com.m2049r.xmrwallet.model;
 
 import com.m2049r.xmrwallet.XmrWalletApplication;
 import com.m2049r.xmrwallet.data.Node;
-import com.m2049r.xmrwallet.ledger.Ledger;
 import com.m2049r.xmrwallet.util.RestoreHeight;
 
 import java.io.File;
@@ -161,10 +160,12 @@ public class WalletManager {
                                               String spendKeyString);
 
     public Wallet createWalletFromDevice(File aFile, String password, long restoreHeight,
-                                         String deviceName) {
+                                         Wallet.Device device) {
+        final String lookahead = device.getAccountLookahead() + ":" + device.getSubaddressLookahead();
+        Timber.d("Creating from %s with %s lookahead", device, lookahead);
         long walletHandle = createWalletFromDeviceJ(aFile.getAbsolutePath(), password,
-                getNetworkType().getValue(), deviceName, restoreHeight,
+                getNetworkType().getValue(), device.name(), restoreHeight,
-                Ledger.SUBADDRESS_LOOKAHEAD);
+                lookahead);
         Wallet wallet = new Wallet(walletHandle);
         manageWallet(wallet);
         return wallet;