Android

android/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

android/README.md

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+## Gomobile instalation
+```
+$ go get golang.org/x/mobile/cmd/gomobile
+$ gomobile init
+```
+## Install Android Studio (on Ubuntu 20.04):
+```
+$ sudo apt install openjdk-11-jdk
+$ sudo snap install android-studio --classic
+```
+## Install Android NDK:
+
+https://developer.android.com/ndk
+
+You may need to configure these enviroment variables:
+```
+export GOPATH=~/go
+export PATH=$PATH:$GOPATH/bin
+export ANDROID_NDK_HOME= {PATH to Android NDK}
+export ANDROID_HOME= {PATH to Android SDK}
+```
+## aar generation
+```
+$ gomobile bind -o app/backup.aar -target=android ../wrapper/
+```
+## Use of .aar in Android project
+
+Edit android\app\build.gradle adding:
+```
++ repositories {
++    flatDir {
++        dirs '.'
++    }
++ }
+
+dependencies {
+...
++    implementation (name:'backup', ext:'aar')
+}
+```

android/app/.gitignore

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+/build

android/app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.3"
+
+    defaultConfig {
+        applicationId "io.iden3.backup"
+        minSdkVersion 16
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+}
+
+repositories {
+    flatDir {
+        dirs '.'
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'androidx.navigation:navigation-fragment:2.2.2'
+    implementation 'androidx.navigation:navigation-ui:2.2.2'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation (name:'backup', ext:'aar')
+
+}

android/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

android/app/src/androidTest/java/io/iden3/backup/ExampleInstrumentedTest.java

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+package io.iden3.backup;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+
+        assertEquals("io.iden3.backup", appContext.getPackageName());
+    }
+}

android/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="io.iden3.backup">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity
+            android:name=".MainActivity"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android/app/src/main/java/io/iden3/backup/FirstFragment.java

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+package io.iden3.backup;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.navigation.fragment.NavHostFragment;
+
+public class FirstFragment extends Fragment {
+
+    @Override
+    public View onCreateView(
+            LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState
+    ) {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_first, container, false);
+    }
+
+    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        view.findViewById(R.id.button_first).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                NavHostFragment.findNavController(FirstFragment.this)
+                        .navigate(R.id.action_FirstFragment_to_SecondFragment);
+            }
+        });
+    }
+}