Fixup wallet locations (#89)

* create wallets directly in wallet dir, renamed backup dir

* new version + notes

README.md

@@ -25,11 +25,13 @@ You may lose all your Moneroj if you use this App. Be cautious when spending on
 - more sensible error dialogs
 
 ### Issues / Pitfalls
+- The backups folder is now called "backups" and not ".backups" - which in most file explorers was a hidden folder
+- Wallets are now created directly in the "monerujo" folder, and not in the ".new" folder as before
+- You may want to check the old folders with a file browsing app and delete the ".new" and ".backups" folders AFTER moving neccessary wallet files to the new locations. Or simply make new backups from within Monerujo.
+- Also note, that on some devices the backups will only be visible on a PC over USB after a reboot of the device (it's an Android bug/feature)
 - Created wallets on a private testnet are unusable because the restore height is set to that
 of the "real" testnet.  After creating a new wallet, make a **new** one by recovering from the seed.
 The official monero client shows the same behaviour.
-- In rare occasions the monero core code returns a wallet address with corrupted characters -
-in these cases Monerujo crashes on purpose to make sure nothing bad happens
 
 ### HOW TO BUILD
 No need to build. Binaries are included:

app/build.gradle

@@ -8,8 +8,8 @@ android {
         applicationId "com.m2049r.xmrwallet"
         minSdkVersion 21
         targetSdkVersion 25
-        versionCode 16
-        versionName "0.8.0.3"
+        versionCode 21
+        versionName "0.8.0.8"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {

app/src/main/cpp/monerujo.cpp

@@ -39,6 +39,8 @@ static jclass class_WalletListener;
 static jclass class_TransactionInfo;
 static jclass class_Transfer;
 
+std::mutex _listenerMutex;
+
 JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
     cachedJVM = jvm;
     LOGI("JNI_OnLoad");
@@ -101,6 +103,7 @@ struct MyWalletListener : Bitmonero::WalletListener {
     };
 
     void deleteGlobalJavaRef(JNIEnv *env) {
+        std::lock_guard<std::mutex> lock(_listenerMutex);
         env->DeleteGlobalRef(jlistener);
         jlistener = nullptr;
     }
@@ -109,6 +112,7 @@ struct MyWalletListener : Bitmonero::WalletListener {
  * @brief updated  - generic callback, called when any event (sent/received/block reveived/etc) happened with the wallet;
  */
     void updated() {
+        std::lock_guard<std::mutex> lock(_listenerMutex);
         if (jlistener == nullptr) return;
         LOGD("updated");
         JNIEnv *jenv;
@@ -128,6 +132,7 @@ struct MyWalletListener : Bitmonero::WalletListener {
      * @param amount     - amount
      */
     void moneySpent(const std::string &txId, uint64_t amount) {
+        std::lock_guard<std::mutex> lock(_listenerMutex);
         if (jlistener == nullptr) return;
         LOGD("moneySpent %"
                      PRIu64, amount);
@@ -139,6 +144,7 @@ struct MyWalletListener : Bitmonero::WalletListener {
      * @param amount        - amount
      */
     void moneyReceived(const std::string &txId, uint64_t amount) {
+        std::lock_guard<std::mutex> lock(_listenerMutex);
         if (jlistener == nullptr) return;
         LOGD("moneyReceived %"
                      PRIu64, amount);
@@ -150,6 +156,7 @@ struct MyWalletListener : Bitmonero::WalletListener {
      * @param amount        - amount
      */
     void unconfirmedMoneyReceived(const std::string &txId, uint64_t amount) {
+        std::lock_guard<std::mutex> lock(_listenerMutex);
         if (jlistener == nullptr) return;
         LOGD("unconfirmedMoneyReceived %"
                      PRIu64, amount);
@@ -160,6 +167,7 @@ struct MyWalletListener : Bitmonero::WalletListener {
      * @param height        - block height
      */
     void newBlock(uint64_t height) {
+        std::lock_guard<std::mutex> lock(_listenerMutex);
         if (jlistener == nullptr) return;
         //LOGD("newBlock");
         JNIEnv *jenv;
@@ -178,6 +186,7 @@ struct MyWalletListener : Bitmonero::WalletListener {
  * @brief refreshed - called when wallet refreshed by background thread or explicitly refreshed by calling "refresh" synchronously
  */
     void refreshed() {
+        std::lock_guard<std::mutex> lock(_listenerMutex);
         if (jlistener == nullptr) return;
         LOGD("refreshed");
         JNIEnv *jenv;
@@ -465,14 +474,15 @@ JNIEXPORT jboolean JNICALL
 Java_com_m2049r_xmrwallet_model_WalletManager_closeJ(JNIEnv *env, jobject instance,
                                                      jobject walletInstance) {
     Bitmonero::Wallet *wallet = getHandle<Bitmonero::Wallet>(env, walletInstance);
-    bool closeSuccess = Bitmonero::WalletManagerFactory::getWalletManager()->closeWallet(wallet, false);
+    bool closeSuccess = Bitmonero::WalletManagerFactory::getWalletManager()->closeWallet(wallet,
+                                                                                         false);
     if (closeSuccess) {
         MyWalletListener *walletListener = getHandle<MyWalletListener>(env, walletInstance,
                                                                        "listenerHandle");
         if (walletListener != nullptr) {
             walletListener->deleteGlobalJavaRef(env);
+            delete walletListener;
         }
-        delete walletListener;
     }
     LOGD("wallet closed");
     return closeSuccess;
@@ -601,7 +611,8 @@ Java_com_m2049r_xmrwallet_model_Wallet_initJ(JNIEnv *env, jobject instance,
     const char *_daemon_username = env->GetStringUTFChars(daemon_username, JNI_FALSE);
     const char *_daemon_password = env->GetStringUTFChars(daemon_password, JNI_FALSE);
     Bitmonero::Wallet *wallet = getHandle<Bitmonero::Wallet>(env, instance);
-    bool status = wallet->init(_daemon_address, upper_transaction_size_limit, _daemon_username, _daemon_password);
+    bool status = wallet->init(_daemon_address, upper_transaction_size_limit, _daemon_username,
+                               _daemon_password);
     env->ReleaseStringUTFChars(daemon_address, _daemon_address);
     env->ReleaseStringUTFChars(daemon_username, _daemon_username);
     env->ReleaseStringUTFChars(daemon_password, _daemon_password);
@@ -919,7 +930,7 @@ jobject newTransferInstance(JNIEnv *env, uint64_t amount, const std::string &add
 
 jobject newTransferList(JNIEnv *env, Bitmonero::TransactionInfo *info) {
     const std::vector<Bitmonero::TransactionInfo::Transfer> &transfers = info->transfers();
-    if (transfers.size()==0) { // don't create empty Lists
+    if (transfers.size() == 0) { // don't create empty Lists
         return nullptr;
     }
     // make new ArrayList

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

@@ -24,6 +24,7 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.media.MediaScannerConnection;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.os.StrictMode;
@@ -308,12 +309,14 @@ public class LoginActivity extends AppCompatActivity
     }
 
     private boolean backupWallet(String walletName) {
-        File backupFolder = new File(getStorageRoot(), ".backups");
+        File backupFolder = new File(getStorageRoot(), "backups");
         if (!backupFolder.exists()) {
             if (!backupFolder.mkdir()) {
                 Log.e(TAG, "Cannot create backup dir " + backupFolder.getAbsolutePath());
                 return false;
             }
+            // make folder visible over USB/MTP
+            MediaScannerConnection.scanFile(this, new String[]{backupFolder.toString()}, null, null);
         }
         File walletFile = Helper.getWalletFile(LoginActivity.this, walletName);
         File backupFile = new File(backupFolder, walletName);
@@ -726,26 +729,17 @@ public class LoginActivity extends AppCompatActivity
 
         @Override
         protected Boolean doInBackground(Void... params) {
-            File newWalletFolder = new File(getStorageRoot(), ".new");
-            if (!newWalletFolder.exists()) {
-                if (!newWalletFolder.mkdir()) {
-                    Log.e(TAG, "Cannot create new wallet dir " + newWalletFolder.getAbsolutePath());
-                    return false;
-                }
-            }
+            File newWalletFolder = getStorageRoot();
             if (!newWalletFolder.isDirectory()) {
-                Log.e(TAG, "New wallet dir " + newWalletFolder.getAbsolutePath() + "is not a directory");
+                Log.e(TAG, "Wallet dir " + newWalletFolder.getAbsolutePath() + "is not a directory");
                 return false;
             }
             File cacheFile = new File(newWalletFolder, walletName);
-            cacheFile.delete();
             File keysFile = new File(newWalletFolder, walletName + ".keys");
-            keysFile.delete();
             File addressFile = new File(newWalletFolder, walletName + ".address.txt");
-            addressFile.delete();
 
             if (cacheFile.exists() || keysFile.exists() || addressFile.exists()) {
-                Log.e(TAG, "Cannot remove all old wallet files: " + cacheFile.getAbsolutePath());
+                Log.e(TAG, "Some wallet files already exist for " + cacheFile.getAbsolutePath());
                 return false;
             }
 
@@ -854,15 +848,11 @@ public class LoginActivity extends AppCompatActivity
 
     @Override
     public void onAccept(final String name, final String password) {
-        File newWalletFile = new File(new File(getStorageRoot(), ".new"), name);
         File walletFolder = getStorageRoot();
         File walletFile = new File(walletFolder, name);
-        boolean rc = copyWallet(newWalletFile, walletFile, false);
-        if (rc) {
-            walletFile.delete(); // when recovering wallets, the cache seems corrupt
-            // TODO: figure out why this is so? Only for a private testnet?
-            rc = testWallet(walletFile.getAbsolutePath(), password) == Wallet.Status.Status_Ok;
-        }
+        walletFile.delete(); // when recovering wallets, the cache seems corrupt
+        // TODO: figure out why this is so? Only for a private testnet?
+        boolean rc = testWallet(walletFile.getAbsolutePath(), password) == Wallet.Status.Status_Ok;
 
         if (rc) {
             popFragmentStack(GENERATE_STACK);
@@ -871,7 +861,7 @@ public class LoginActivity extends AppCompatActivity
         } else {
             Log.e(TAG, "Wallet store failed to " + walletFile.getAbsolutePath());
             Toast.makeText(LoginActivity.this,
-                    getString(R.string.generate_wallet_create_failed_2), Toast.LENGTH_LONG).show();
+                    getString(R.string.generate_wallet_create_failed), Toast.LENGTH_LONG).show();
         }
     }
 

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

@@ -186,7 +186,7 @@ public class LoginFragment extends Fragment {
         etDaemonAddress.setOnFocusChangeListener(new View.OnFocusChangeListener() {
             @Override
             public void onFocusChange(View v, boolean hasFocus) {
-                if (hasFocus) {
+                if (hasFocus && !getActivity().isFinishing() && etDaemonAddress.isLaidOut()) {
                     etDaemonAddress.showDropDown();
                     Helper.showKeyboard(getActivity());
                 }
@@ -376,7 +376,7 @@ public class LoginFragment extends Fragment {
     }
 
     String getDaemon() {
-        return etDaemonAddress.getText().toString();
+        return etDaemonAddress.getText().toString().trim();
     }
 
     void setDaemon(NodeList nodeList) {

app/src/main/java/com/m2049r/xmrwallet/license/LicensesFragment.java

@@ -144,7 +144,7 @@ public class LicensesFragment extends DialogFragment {
         mWebView = (WebView) content.findViewById(R.id.licensesFragmentWebView);
         mIndeterminateProgress = (ProgressBar) content.findViewById(R.id.licensesFragmentIndeterminateProgress);
 
-        boolean showCloseButton = false;
+        boolean showCloseButton = true;
         Bundle arguments = getArguments();
         if (arguments != null) {
             showCloseButton = arguments.getBoolean(KEY_SHOW_CLOSE_BUTTON);

app/src/main/res/layout/gen_fragment.xml

@@ -1,107 +1,112 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:weightSum="2">
+        android:layout_height="match_parent"
+        android:orientation="vertical">
 
-        <EditText
-            android:id="@+id/etWalletName"
-            style="@style/MoneroEdit"
-            android:layout_width="0dp"
+        <LinearLayout
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:hint="@string/generate_name_hint"
-            android:imeOptions="actionNext"
-            android:inputType="text"
-            android:maxLines="1"
-            android:textAlignment="center" />
+            android:orientation="horizontal"
+            android:weightSum="2">
+
+            <EditText
+                android:id="@+id/etWalletName"
+                style="@style/MoneroEdit"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:hint="@string/generate_name_hint"
+                android:imeOptions="actionNext"
+                android:inputType="text"
+                android:maxLines="1"
+                android:textAlignment="center" />
+
+            <EditText
+                android:id="@+id/etWalletPassword"
+                style="@style/MoneroEdit"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:hint="@string/generate_password_hint"
+                android:imeOptions="actionNext"
+                android:inputType="text"
+                android:textAlignment="center" />
+        </LinearLayout>
 
         <EditText
-            android:id="@+id/etWalletPassword"
-            style="@style/MoneroEdit"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:hint="@string/generate_password_hint"
-            android:imeOptions="actionNext"
-            android:inputType="text"
-            android:textAlignment="center" />
-    </LinearLayout>
-
-    <EditText
-        android:id="@+id/etWalletMnemonic"
-        style="@style/MoneroEdit"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:hint="@string/generate_mnemonic_hint"
-        android:imeOptions="actionNext"
-        android:inputType="textMultiLine"
-        android:textAlignment="center" />
-
-    <EditText
-        android:id="@+id/etWalletAddress"
-        style="@style/MoneroEdit"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:hint="@string/generate_address_hint"
-        android:imeOptions="actionNext"
-        android:inputType="textMultiLine"
-        android:textAlignment="center" />
-
-    <LinearLayout
-        android:id="@+id/llRestoreKeys"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:gravity="center"
-        android:orientation="vertical"
-        android:visibility="gone">
-
-        <EditText
-            android:id="@+id/etWalletViewKey"
+            android:id="@+id/etWalletMnemonic"
             style="@style/MoneroEdit"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:hint="@string/generate_viewkey_hint"
+            android:hint="@string/generate_mnemonic_hint"
             android:imeOptions="actionNext"
             android:inputType="textMultiLine"
             android:textAlignment="center" />
 
         <EditText
-            android:id="@+id/etWalletSpendKey"
+            android:id="@+id/etWalletAddress"
             style="@style/MoneroEdit"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:hint="@string/generate_spendkey_hint"
+            android:hint="@string/generate_address_hint"
             android:imeOptions="actionNext"
             android:inputType="textMultiLine"
-            android:textAlignment="center"/>
+            android:textAlignment="center" />
+
+        <LinearLayout
+            android:id="@+id/llRestoreKeys"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:orientation="vertical"
+            android:visibility="gone">
+
+            <EditText
+                android:id="@+id/etWalletViewKey"
+                style="@style/MoneroEdit"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:hint="@string/generate_viewkey_hint"
+                android:imeOptions="actionNext"
+                android:inputType="textMultiLine"
+                android:textAlignment="center" />
+
+            <EditText
+                android:id="@+id/etWalletSpendKey"
+                style="@style/MoneroEdit"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:hint="@string/generate_spendkey_hint"
+                android:imeOptions="actionNext"
+                android:inputType="textMultiLine"
+                android:textAlignment="center" />
+        </LinearLayout>
+
+        <EditText
+            android:id="@+id/etWalletRestoreHeight"
+            style="@style/MoneroEdit"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="@string/generate_restoreheight_hint"
+            android:imeOptions="actionDone"
+            android:inputType="number"
+            android:textAlignment="center"
+            android:visibility="gone" />
+
+        <Button
+            android:id="@+id/bGenerate"
+            style="@style/MoneroButton"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="8dp"
+            android:layout_marginTop="8dp"
+            android:enabled="false"
+            android:text="@string/generate_buttonGenerate" />
+
     </LinearLayout>
-
-    <EditText
-        android:id="@+id/etWalletRestoreHeight"
-        style="@style/MoneroEdit"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:hint="@string/generate_restoreheight_hint"
-        android:imeOptions="actionDone"
-        android:inputType="number"
-        android:textAlignment="center"
-        android:visibility="gone" />
-
-    <Button
-        android:id="@+id/bGenerate"
-        style="@style/MoneroButton"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="8dp"
-        android:layout_marginTop="8dp"
-        android:enabled="false"
-        android:text="@string/generate_buttonGenerate" />
-
-</LinearLayout>
+</ScrollView>

app/src/main/res/values/strings.xml

@@ -100,8 +100,6 @@
     <string name="generate_wallet_creating">Creating wallet</string>
     <string name="generate_wallet_created">Wallet created</string>
     <string name="generate_wallet_create_failed">Wallet create failed</string>
-    <string name="generate_wallet_create_failed_1">Wallet create failed (1/2)</string>
-    <string name="generate_wallet_create_failed_2">Wallet create failed (2/2)</string>
     <string name="generate_address_placeholder">9tDC52GsMjTNt4dpnRCwAF7ekVBkbkgkXGaMKTcSTpBhGpqkPX56jCNRydLq9oGjbbAQBsZhLfgmTKsntmxRd3TaJFYM2f8</string>
     <string name="generate_viewkey_placeholder">e2b99f4cc3d644774c4b118db05f8aa9967583a01ca4d47058c3860af10bd306</string>
     <string name="generate_spendkey_placeholder">300a54208ab0a638a8407a12e3de946da76f5a9ded303338452332ec7755210d</string>

doc/BUILDING-external-libs.md

@@ -8,7 +8,7 @@ replacing "32" with "64".
 ## Prepare Ubuntu environment
 
 ```
-sudo apt-get install build-essential cmake tofrodos
+sudo apt-get install build-essential cmake tofrodos libtool-bin
 sudo mkdir /opt/android
 sudo chown $LOGNAME /opt/android
 ```
@@ -70,9 +70,9 @@ ln -s ../../../../openssl/android-21/lib/libcrypto.so
 ## Build Boost
 ```
 cd /opt/android
-wget https://sourceforge.net/projects/boost/files/boost/1.64.0/boost_1_64_0.tar.gz/download -O boost_1_64_0.tar.gz
-tar xfz boost_1_64_0.tar.gz
-(cd boost_1_64_0; ./bootstrap.sh)
+wget https://sourceforge.net/projects/boost/files/boost/1.58.0/boost_1_58_0.tar.gz/download -O boost_1_58_0.tar.gz
+tar xfz boost_1_58_0.tar.gz
+(cd boost_1_58_0; ./bootstrap.sh)
 ```
 The NDK r15c above gives errors about fsetpos and fgetpos not found(!?!), so we "just" comment them out in the include file:
 `nano /opt/android/tool32/include/c++/4.9.x/cstdio` (`//using ::fgetpos`, `//using ::fsetpos`)
@@ -83,21 +83,51 @@ export PATH=/opt/android/tool32/arm-linux-androideabi/bin:/opt/android/tool32/bi
 ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --build-dir=android32 --stagedir=android32 toolset=clang threading=multi threadapi=pthread target-os=android stage
 ```
 
+## Build & prepare zeromq
+```
+cd /opt/android
+wget git clone https://github.com/zeromq/zeromq3-x.git
+export PATH=/opt/android/tool32/arm-linux-androideabi/bin:/opt/android/tool32/bin:$PATH
+export OUTPUT_DIR=/opt/android/zeromq
+./configure --enable-static --disable-shared --host=arm-linux-androideabi --prefix=$OUTPUT_DIR LDFLAGS="-L$OUTPUT_DIR/lib" CPPFLAGS="-isystem /opt/android/tool32/include/c++/4.9.x -fPIC -I$OUTPUT_DIR/include -Wno-error -D__ANDROID_API__=21" LIBS="-lgcc"
+make
+make install
+
+git clone https://github.com/zeromq/cppzmq.git
+cp cppzmq/*.hpp zeromq/include/
+```
+
 ## And finally: Build Monero
 ```
 cd /opt/android
 git clone https://github.com/monero-project/monero
 cd monero
-
+```
+```
 # <patch monero code as needed>
-
+# also, don't abort on warnings:
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1f74f59..2c791c0 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -400,7 +400,7 @@ else()
+     set(ARCH_FLAG "-march=${ARCH}")
+   endif()
+   set(WARNINGS "-Wall -Wextra -Wpointer-arith -Wundef -Wvla -Wwrite-strings -Wno-error=extra -Wno-error=deprecated-declarations -Wno-unused-parameter -Wno-unused-variable -Wno-error=unused-variable -Wno-error=undef -Wno-error=uninitialized")
+-  if(NOT MINGW)
++  if(NOT MINGW AND NOT ANDROID)
+     set(WARNINGS_AS_ERRORS_FLAG "-Werror")
+   endif()
+   if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
+```
+```
 mkdir -p build/release.android32
 cd build/release.android32
 
 # only if not set already set
 export PATH=/opt/android/tool32/arm-linux-androideabi/bin:/opt/android/tool32/bin:$PATH
 
-CC=clang CXX=clang++ cmake -D BUILD_TESTS=OFF -D ARCH="armv7-a" -D STATIC=ON -D BUILD_64=OFF -D CMAKE_BUILD_TYPE=release -D ANDROID=true -D BUILD_TAG="android" -D BOOST_ROOT=/opt/android/boost_1_64_0 -D BOOST_LIBRARYDIR=/opt/android/boost_1_64_0/android32/lib  -D OPENSSL_ROOT_DIR=/opt/android/openssl/android-21 -D CMAKE_POSITION_INDEPENDENT_CODE:BOOL=true ../..
+CC=clang CXX=clang++ cmake -D BUILD_TESTS=OFF -D ARCH="armv7-a" -D STATIC=ON -D BUILD_64=OFF -D CMAKE_BUILD_TYPE=release -D ANDROID=true -D BUILD_TAG="android" -D BOOST_ROOT=/opt/android/boost_1_58_0 -D BOOST_LIBRARYDIR=/opt/android/boost_1_58_0/android32/lib  -D OPENSSL_ROOT_DIR=/opt/android/openssl/android-21 -D CMAKE_POSITION_INDEPENDENT_CODE:BOOL=true -D ZMQ_INCLUDE_PATH=/opt/android/zeromq/include -D ZMQ_LIB=/opt/android/zeromq/lib/libzmq.a ../..
 make
 
 find . -name '*.a' -exec cp '{}' lib \;

doc/FAQ.md

@@ -27,6 +27,11 @@
 - Archive (=Backup and delete)
 - 3 Default nodes + History of last 5 used nodes
 
+## After installing from Google Play the wallet list is empty!
+Sorry about that.  The folder for the wallets was renamed from "Monerujo" to "monerujo".
+On most devices this does not matter (they don't care about upper/lower case). Yours does.
+If you use a file explorer (e.g. es file explorer) you can find the Monerujo folder and rename it to "monerujo".
+
 ## I cannot select and copy the mnemonic seed
 Copying anything to the clipboard on Android exposes it to any other App running. So this
 is a security measure to keep your seed safe(r).