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aNNiMONaNNiMON
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‎.gitignore‎

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*.iml
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.gradle
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/local.properties
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/.idea
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/build
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/captures

‎LICENSE‎

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The MIT License
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Copyright (c) 2016 Victor Melnik
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.

‎app/.gitignore‎

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/build

‎app/build.gradle‎

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apply plugin: 'com.android.application'
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android {
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compileSdkVersion 23
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buildToolsVersion "23.0.3"
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defaultConfig {
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applicationId "com.annimon.androidplugindemo"
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minSdkVersion 9
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targetSdkVersion 23
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versionCode 1
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versionName "1.0"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
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}
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}
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}
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dependencies {
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compile fileTree(dir: 'libs', include: ['*.jar'])
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compile 'com.android.support:appcompat-v7:23.3.0'
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}

‎app/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# By default, the flags in this file are appended to flags specified
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# in D:\Android\android-sdk/tools/proguard/proguard-android.txt
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# You can edit the include path and order by changing the proguardFiles
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# directive in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# Add any project specific keep options here:
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}

‎app/src/main/AndroidManifest.xml‎

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

‎app/src/main/assets/library.apk‎

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‎app/src/main/java/com/annimon/androidplugindemo/IOUtil.java‎

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package com.annimon.androidplugindemo;
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import android.content.Context;
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import android.support.annotation.Nullable;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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public class IOUtil {
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@Nullable
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public static String extractAssetToInternalStorage(Context context, String fileName) {
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try {
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final InputStream is = context.getAssets().open(fileName);
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final File file = new File(context.getFilesDir(), fileName);
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final OutputStream os = new FileOutputStream(file);
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final int length = 1024;
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final byte[] buffer = new byte[length];
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int readed;
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while ((readed = is.read(buffer)) != -1) {
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os.write(buffer, 0, readed);
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}
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os.flush();
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os.close();
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is.close();
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return file.getAbsolutePath();
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} catch (IOException e) {
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return null;
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}
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}
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}

‎app/src/main/java/com/annimon/androidplugindemo/MainActivity.java‎

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package com.annimon.androidplugindemo;
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import android.content.Context;
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import android.content.Intent;
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import android.content.pm.ApplicationInfo;
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import android.content.pm.PackageManager;
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import android.content.res.Resources;
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import android.os.Bundle;
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import android.support.v7.app.AppCompatActivity;
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import android.support.v7.widget.Toolbar;
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import android.view.View;
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import android.widget.TextView;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.util.List;
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import dalvik.system.DexClassLoader;
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public class MainActivity extends AppCompatActivity implements View.OnClickListener {
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private static final String CATEGORY_PLUGIN = "com.annimon.plugin.PLUGIN_APPLICATION";
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private static final String PLUGIN_PACKAGE = "com.annimon.plugin";
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private Toolbar toolbar;
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private TextView infoTextView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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infoTextView = (TextView) findViewById(R.id.info);
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toolbar = (Toolbar) findViewById(R.id.toolbar);
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setSupportActionBar(toolbar);
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int[] ids = {R.id.launch_plugin_activity, R.id.invoke_code, R.id.invoke_library};
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for (int id : ids) {
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findViewById(id).setOnClickListener(this);
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}
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}
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@Override
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public void onClick(View v) {
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switch (v.getId()) {
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case R.id.launch_plugin_activity:
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launchPluginActivity();
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break;
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case R.id.invoke_code:
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invokeCode();
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break;
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case R.id.invoke_library:
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invokeLibrary();
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break;
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}
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}
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/*
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* Checks if plugin application is installed.
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*/
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private boolean isPluginInstalled() {
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if (!PackageUtil.isApplicationInstalled(this, PLUGIN_PACKAGE)) {
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infoTextView.setText(R.string.plugin_not_installed);
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return false;
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}
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return true;
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}
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/*
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* Gets information about plugin application (label, icon, resources), then launch activity.
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*/
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private void launchPluginActivity() {
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PackageManager pm = getApplicationContext().getPackageManager();
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// Search plugin applications
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Intent queryIntent = new Intent(Intent.ACTION_MAIN);
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queryIntent.addCategory(CATEGORY_PLUGIN);
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final List<ApplicationInfo> infos = PackageUtil.filterApplicationsByIntent(pm, queryIntent);
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if (infos.isEmpty()) {
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infoTextView.setText(R.string.plugin_not_installed);
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return;
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}
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// Get first app
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ApplicationInfo appInfo = infos.get(0);
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// Get simple information from ApplicationInfo
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StringBuilder info = new StringBuilder();
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info.append("Label: ").append(appInfo.loadLabel(pm)).append("\n");
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info.append("Package name: ").append(appInfo.packageName).append("\n");
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info.append("Source dir: ").append(appInfo.sourceDir).append("\n");
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info.append("Target SDK Version: ").append(appInfo.targetSdkVersion).append("\n");
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toolbar.setLogo(appInfo.loadIcon(pm));
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// Get resources
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Resources pluginResources = PackageUtil.getResources(pm, appInfo);
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if (pluginResources != null) {
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// Get string resource
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int plugin_text = pluginResources.getIdentifier("plugin_text", "string", appInfo.packageName);
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if (plugin_text > 0) {
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info.append("Plugin text: ").append(pluginResources.getString(plugin_text)).append("\n");
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}
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// Get color resource
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int colorPrimaryDark = pluginResources.getIdentifier("colorPrimaryDark", "color", appInfo.packageName);
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if (colorPrimaryDark > 0) {
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toolbar.setBackgroundColor(pluginResources.getColor(colorPrimaryDark));
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}
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}
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infoTextView.setText(info);
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// Start Activity
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Intent activityIntent = pm.getLaunchIntentForPackage(appInfo.packageName);
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startActivity(activityIntent);
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}
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/**
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* Invokes code from plugin application in separate ClassLoader.
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*/
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private void invokeCode() {
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if (!isPluginInstalled()) return;
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Context pluginContext = PackageUtil.getPackageContext(this, PLUGIN_PACKAGE);
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if (pluginContext == null) return;
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ClassLoader classLoader = pluginContext.getClassLoader();
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StringBuilder info = new StringBuilder();
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try {
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// Invoke class via Reflection API
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Class<?> pluginClass = classLoader.loadClass(PLUGIN_PACKAGE + ".Plugin");
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Field goldenRatio = pluginClass.getDeclaredField("GOLDEN_RATIO");
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info.append("GOLDEN_RATIO: ").append(goldenRatio.getDouble(null)).append("\n");
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Method sum = pluginClass.getDeclaredMethod("sum", int.class, int.class);
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info.append("sum(42, 280): ").append(sum.invoke(null, 42, 280)).append("\n");
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Method reverse = pluginClass.getDeclaredMethod("reverse", String.class);
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info.append("reverse(\"abcdefgh\"): ").append(reverse.invoke(null, "abcdefgh"));
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} catch (Exception e) {
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info.append("Unable to retrieve data, ").append(e.toString());
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}
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infoTextView.setText(info);
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}
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/**
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* Extracts library.apk to internal storage, then invoke code.
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*/
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private void invokeLibrary() {
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final String filename = "library.apk";
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String path = IOUtil.extractAssetToInternalStorage(this, filename);
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if (path == null) {
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infoTextView.setText("Unable to extract " + filename + " to internal storage");
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return;
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}
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StringBuilder info = new StringBuilder();
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try {
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DexClassLoader dexClassLoader = new DexClassLoader(
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path, getFilesDir().getAbsolutePath(), null,
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getClassLoader());
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final Class<?> infoClass = dexClassLoader.loadClass("plugin.Info");
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// Invoke default constructor
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Object defaultObject = infoClass.newInstance();
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Method getInfo = infoClass.getDeclaredMethod("getInfo");
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String defaultInfo = (String) getInfo.invoke(defaultObject);
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info.append("new Info().getInfo(): ").append(defaultInfo).append("\n");
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// Invoke constructor with argument
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Constructor constructor = infoClass.getDeclaredConstructor(String.class);
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Object testObject = constructor.newInstance("Test");
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String testInfo = (String) getInfo.invoke(testObject);
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info.append("new Info(\"Test\").getInfo(): ").append(testInfo);
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} catch (Exception e) {
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info.append("Unable to retrieve data, ").append(e.toString());
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}
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infoTextView.setText(info);
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}
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}

‎app/src/main/java/com/annimon/androidplugindemo/PackageUtil.java‎

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package com.annimon.androidplugindemo;
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import android.content.Context;
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import android.content.Intent;
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import android.content.pm.ApplicationInfo;
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import android.content.pm.PackageManager;
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import android.content.pm.ResolveInfo;
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import android.content.res.Resources;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import java.util.ArrayList;
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import java.util.List;
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public class PackageUtil {
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public static boolean isApplicationInstalled(Context context, String packageName) {
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return (getApplicationInfo(context, packageName) != null);
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}
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@Nullable
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public static ApplicationInfo getApplicationInfo(Context context, String packageName) {
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PackageManager pacman = context.getApplicationContext().getPackageManager();
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return getApplicationInfo(pacman, packageName);
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}
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@Nullable
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public static ApplicationInfo getApplicationInfo(PackageManager pacman, String packageName) {
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try {
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return pacman.getApplicationInfo(packageName, 0);
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} catch (PackageManager.NameNotFoundException e) {
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return null;
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}
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}
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@Nullable
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public static Resources getResources(PackageManager pacman, ApplicationInfo appInfo) {
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try {
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return pacman.getResourcesForApplication(appInfo);
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} catch (PackageManager.NameNotFoundException e) {
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return null;
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}
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}
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@NonNull
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public static List<ApplicationInfo> filterApplicationsByIntent(PackageManager pm, Intent intent) {
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final List<ApplicationInfo> result = new ArrayList<>();
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List<ResolveInfo> infos = pm.queryIntentActivities(intent, 0);
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for (ResolveInfo resolveInfo : infos) {
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if (resolveInfo.activityInfo != null) {
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result.add(resolveInfo.activityInfo.applicationInfo);
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}
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}
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return result;
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}
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@Nullable
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public static Context getPackageContext(Context context, String packageName) {
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try {
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return context.getApplicationContext().createPackageContext(packageName,
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Context.CONTEXT_INCLUDE_CODE | Context.CONTEXT_IGNORE_SECURITY);
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} catch (PackageManager.NameNotFoundException e) {
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return null;
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}
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}
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}

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