Added example android project

_examples/android/AgeMobile/.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
+local.properties

_examples/android/AgeMobile/app/.gitignore

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+/build

_examples/android/AgeMobile/app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 32
+
+    defaultConfig {
+        applicationId "com.example.agemobile"
+        minSdk 21
+        targetSdk 32
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    namespace 'com.example.agemobile'
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.4.2'
+    implementation 'com.google.android.material:material:1.6.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    // AgeMobile aar from Go
+    implementation fileTree(include: ['*.aar'], dir: 'libs')
+}

_examples/android/AgeMobile/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

_examples/android/AgeMobile/app/src/androidTest/java/com/example/agemobile/ExampleInstrumentedTest.java

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+package com.example.agemobile;
+
+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("com.example.agemobile", appContext.getPackageName());
+    }
+}

_examples/android/AgeMobile/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">
+
+    <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/Theme.AgeMobile">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

_examples/android/AgeMobile/app/src/main/java/com/example/agemobile/MainActivity.java

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+package com.example.agemobile;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+import android.text.Editable;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.google.android.material.textfield.TextInputEditText;
+
+import agemobile.Agemobile;
+
+public class MainActivity extends AppCompatActivity {
+    age.X25519Identity identity;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        TextInputEditText encryptInput = findViewById(R.id.textToEncrypt);
+
+        TextView keyView = findViewById(R.id.keysView);
+        TextView encryptResults = findViewById(R.id.encryptResults);
+        TextView decryptResults = findViewById(R.id.decryptText);
+
+        Button generateKey = findViewById(R.id.generateKey);
+        Button encryptBtn = findViewById(R.id.encryptBtn);
+        Button decryptBtn = findViewById(R.id.decryptBtn);
+
+        generateKey.setOnClickListener(view -> {
+            try {
+                identity = Agemobile.generateX25519Identity();
+                String txt = "Private Key:\n"+identity.string()+"\nPublic Key:\n"+identity.recipient().string();
+                keyView.setText(txt);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+
+        });
+
+        encryptBtn.setOnClickListener(view -> {
+            Editable editable = encryptInput.getText();
+            if(editable != null && editable.length() > 0) {
+                if(identity == null) {
+                    Toast.makeText(view.getContext(), "Please generate key first",Toast.LENGTH_LONG).show();
+                    return;
+                }
+                String text = editable.toString();
+                try {
+                    // public key, text and with armor
+                    String results = Agemobile.encrypt(identity.recipient().string(), text, true);
+                    encryptResults.setText(results);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }else {
+                Toast.makeText(view.getContext(), "Please input some text to encrypt",Toast.LENGTH_LONG).show();
+            }
+        });
+
+        decryptBtn.setOnClickListener(view -> {
+            String txt = encryptResults.getText().toString();
+            if(!txt.isEmpty()) {
+                if(identity == null) {
+                    Toast.makeText(view.getContext(), "Please generate key first",Toast.LENGTH_LONG).show();
+                    return;
+                }
+
+                try {
+                    // private key and encrypted text
+                    String results = Agemobile.decrypt(identity.string(), txt);
+                    decryptResults.setText(results);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+
+            }else {
+                Toast.makeText(view.getContext(), "Please encrypt some text",Toast.LENGTH_LONG).show();
+            }
+
+        });
+
+
+
+    }
+}

_examples/android/AgeMobile/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>