本身動手寫Android插件化框架，讓老闆對你另眼相看

時間 2019-12-02

原文原文鏈接

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最近在工做中接觸到了Android插件內的開發，發現本身這種技術還缺少最基本的瞭解，以致於在一些基本問題上浪費很多時間，如插件Context和主工程Context的區別，權限必須在主工程申明等，所以花了點時間瞭解了一下插件的歷史，並寫了兩個Demo做爲總結。本文旨在經過兩個實例直觀的說明插件的實現原理以加深對插件內開發的理解，所以不會深刻探討背景和原理，代碼也儘可能專一於核心邏輯。github

原理與背景

Android插件化從技術上來講就是如何啓動未安裝的apk（主要是四大組件）裏面的類，主要問題涉及如何加載類、如何加載資源、如何管理組件生命週期。spring

類加載

Android對於外部的dex文件，主要經過DexClassLoader類加載，所以，只須要給定插件的路徑，就能夠構造對應的類加載器：vim

private DexClassLoader createDexClassLoader(String apkPath) {
    File dexOutputDir = mContext.getDir("dex", Context.MODE_PRIVATE);
    DexClassLoader loader = new DexClassLoader(apkPath, dexOutputDir.getAbsolutePath(),
            null, mContext.getClassLoader());
    return loader;
}

資源加載

Android系統經過Resource對象加載資源,所以只須要添加資源（即apk文件）所在路徑到AssetManager中，便可實現對插件資源的訪問。設計模式

AssetManager assetManager = AssetManager.class.newInstance();
  Method addAssetPath = assetManager.getClass().getMethod(addAssetPathMethod, String.class);
  addAssetPath.invoke(assetManager, apkPath);
  Resources pluginRes = new Resources(assetManager,
          mContext.getResources().getDisplayMetrics(),
          mContext.getResources().getConfiguration());
  pluginApk = new PluginApk(pluginRes);
  pluginApk.classLoader = createDexClassLoader(apkPath);

生命週期

插件化中較爲複雜的是對生命週期的管理，其中以Activity最爲複雜。早期的dynamic-load-apk採用的是代理的方式，經過一個空殼Activity做爲代理（Proxy），系統對該Activity的回調都會映射到插件Activity，如此即可以實現經過系統來管理插件的生命週期。這種方式十分直觀，可是須要全部的插件Activity都繼承這個用做代理的PluginActivity（Demo中的命名），侵入性強，可結合後面的例子加深理解。所以，如何避免這種侵入性成了第二代插件化框架的目標，VirtualApk經過Hook少許系統類達到了這個目標，插件的開發和普通工程無異，接入成本極低。springboot

瞭解了這些原理每每還不夠，知識每每須要通過推導和實踐才能變成本身的，所以，接下來咱們結合這些原理來實現一個插件化框架，不考慮兼容性和健壯性，純粹來實踐上面說起的原理。session

代理實現

首先創建一個PluginManager類來實現插件的加載：app

public class PluginManager {
    static class PluginMgrHolder {
        static PluginManager sManager = new PluginManager();
    }

    private static Context mContext;

    Map<String, PluginApk> sMap = new HashMap<>();

    public static PluginManager getInstance() {
        return PluginMgrHolder.sManager;
    }
    public PluginApk getPluginApk(String packageName) {
        return sMap.get(packageName);
    }

    public static void init(Context context) {
        mContext = context.getApplicationContext();
    }

    public final void loadApk(String apkPath) {
        PackageInfo packageInfo = queryPackageInfo(apkPath);
        if (packageInfo == null || TextUtils.isEmpty(packageInfo.packageName)) {
            return;
        }
        // check cache
        PluginApk pluginApk = sMap.get(packageInfo.packageName);

        if (pluginApk == null) {
            pluginApk = createApk(apkPath);
            if (pluginApk != null) {
                pluginApk.packageInfo = packageInfo;
                sMap.put(packageInfo.packageName, pluginApk);
            } else {
                throw new NullPointerException("PluginApk is null");
            }
        }
    }

    private PluginApk createApk(String apkPath) {
        String addAssetPathMethod = "addAssetPath";
        PluginApk pluginApk = null;
        try {
            AssetManager assetManager = AssetManager.class.newInstance();
            Method addAssetPath = assetManager.getClass().getMethod(addAssetPathMethod, String.class);
            addAssetPath.invoke(assetManager, apkPath);
            Resources pluginRes = new Resources(assetManager,
                    mContext.getResources().getDisplayMetrics(),
                    mContext.getResources().getConfiguration());
            pluginApk = new PluginApk(pluginRes);
            pluginApk.classLoader = createDexClassLoader(apkPath);
        } catch (IllegalAccessException
                | InstantiationException
                | NoSuchMethodException
                | InvocationTargetException e) {
            e.printStackTrace();
        }
        return pluginApk;
    }
    private PackageInfo queryPackageInfo(String apkPath) {
        PackageInfo packageInfo = mContext.getPackageManager().getPackageArchiveInfo(apkPath,
                PackageManager.GET_ACTIVITIES | PackageManager.GET_SERVICES);
        if (packageInfo == null) {
            return null;
        }
        return packageInfo;
    }

    private DexClassLoader createDexClassLoader(String apkPath) {
        File dexOutputDir = mContext.getDir("dex", Context.MODE_PRIVATE);
        DexClassLoader loader = new DexClassLoader(apkPath, dexOutputDir.getAbsolutePath(),
                null, mContext.getClassLoader());
        return loader;
    }

    public void startActivity(Intent intent) {
        Intent pluginIntent = new Intent(mContext, ProxyActivity.class);
        Bundle extra = intent.getExtras();
        // complicate if statement
        if (extra == null || !extra.containsKey(Constants.PLUGIN_CLASS_NAME) && !extra.containsKey(Constants.PACKAGE_NAME)) {
            try {
                throw new IllegalAccessException("lack class of plugin and package name");
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        pluginIntent.putExtras(intent);
        pluginIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        mContext.startActivity(pluginIntent);
    }
}

PluginApk表示一個Apk文件：框架

public class PluginApk {
    public PackageInfo packageInfo;
    public DexClassLoader classLoader;
    public Resources pluginRes;

    public PluginApk(Resources pluginRes) {
        this.pluginRes = pluginRes;
    }

}

全部插件Activity都要繼承一個父類PluginActivity:

public abstract class PluginActivity extends Activity implements Pluginable, Attachable<Activity> {
    public final static String TAG = PluginActivity.class.getSimpleName();
    protected Activity mProxyActivity;
    private Resources mResources;
    PluginApk mPluginApk;

    @Override
    public void attach(Activity proxy, PluginApk apk) {
        mProxyActivity = proxy;
        mPluginApk = apk;
        mResources = apk.pluginRes;
    }

    @Override
    public void setContentView(int layoutResID) {
        mProxyActivity.setContentView(layoutResID);
    }

    @Override
    public void setContentView(View view) {
        mProxyActivity.setContentView(view);
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        mProxyActivity.setContentView(view, params);
    }


    @Override
    public View findViewById(int id) {
        return mProxyActivity.findViewById(id);
    }

    @Override
    public Resources getResources() {
        return mResources;
    }

    @Override
    public WindowManager getWindowManager() {
        return mProxyActivity.getWindowManager();
    }

    @Override
    public ClassLoader getClassLoader() {
        return mProxyActivity.getClassLoader();
    }

    @Override
    public Context getApplicationContext() {
        return mProxyActivity.getApplicationContext();
    }

    @Override
    public MenuInflater getMenuInflater() {
        return mProxyActivity.getMenuInflater();
    }


    @Override
    public Window getWindow() {
        return mProxyActivity.getWindow();
    }

    @Override
    public Intent getIntent() {
        return mProxyActivity.getIntent();
    }

    @Override
    public LayoutInflater getLayoutInflater() {
        return mProxyActivity.getLayoutInflater();
    }

    @Override
    public String getPackageName() {
        return mPluginApk.packageInfo.packageName;
    }


    @Override
    public void onCreate(Bundle bundle) {
        // DO NOT CALL super.onCreate(bundle)
        // following same
        VLog.log(TAG + ": onCreate");
    }

    @Override
    public void onStart() {

    }

    @Override
    public void onResume() {

    }

    @Override
    public void onStop() {

    }

    @Override
    public void onPause() {

    }

    @Override
    public void onDestroy() {
    }
}

這個類只是一個殼，系統會經過ProxyActivity觸發對應的方法的具體實現：

public class ProxyActivity extends Activity {
    LifeCircleController mPluginController = new LifeCircleController(this);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mPluginController.onCreate(getIntent().getExtras());
    }

    @Override
    public Resources getResources() {
        // construct when loading apk
        Resources resources = mPluginController.getResources();
        return resources == null ? super.getResources() : resources;
    }

    @Override
    public Resources.Theme getTheme() {
        Resources.Theme theme = mPluginController.getTheme();
        return theme == null ? super.getTheme() : theme;
    }

    @Override
    public AssetManager getAssets() {
        return mPluginController.getAssets();
    }


    @Override
    protected void onStart() {
        super.onStart();
        mPluginController.onStart();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mPluginController.onResume();
    }

    @Override
    protected void onStop() {
        super.onStop();
        mPluginController.onStop();
    }

    @Override
    protected void onPause() {
        super.onPause();
        mPluginController.onPause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mPluginController.onDestroy();
    }
}

這個類是系統實際啓動的類，其主要邏輯由LifeCircleController負責：

public class LifeCircleController implements Pluginable {
    Activity mProxy;
    PluginActivity mPlugin;
    Resources mResources;
    Resources.Theme mTheme;
    PluginApk mPluginApk;
    String mPluginClazz;

    public LifeCircleController(Activity activity) {
        mProxy = activity;
    }

    public void onCreate(Bundle bundle) {
        mPluginClazz = bundle.getString(Constants.PLUGIN_CLASS_NAME);
        String packageName = bundle.getString(Constants.PACKAGE_NAME);
        mPluginApk = PluginManager.getInstance().getPluginApk(packageName);
        try {
            mPlugin = (PluginActivity) loadPluginable(mPluginApk.classLoader, mPluginClazz);
            mPlugin.attach(mProxy, mPluginApk);
            mResources = mPluginApk.pluginRes;
            mPlugin.onCreate(bundle);
        } catch (Exception e) {
            VLog.log("Fail in LifeCircleController onCreate");
            VLog.log(e.getMessage());
            e.printStackTrace();
        }

    }
    private Object loadPluginable(ClassLoader classLoader, String pluginActivityClass)
            throws Exception {
        Class<?> pluginClz = classLoader.loadClass(pluginActivityClass);
        Constructor<?> constructor = pluginClz.getConstructor(new Class[] {});
        constructor.setAccessible(true);
        return constructor.newInstance(new Object[] {});
    }

    @Override
    public void onStart() {
        if (mPlugin != null) {
            mPlugin.onStart();
        }
    }

    @Override
    public void onResume() {
        if (mPlugin != null) {
            mPlugin.onResume();
        }
    }

    @Override
    public void onStop() {
        mPlugin.onStop();
    }

    @Override
    public void onPause() {
        mPlugin.onPause();
    }

    @Override
    public void onDestroy() {
        mPlugin.onDestroy();
    }

    public Resources getResources() {
        return mResources;
    }

    public Resources.Theme getTheme() {
        return mTheme;
    }

    public AssetManager getAssets() {
        return mResources.getAssets();
    }

}

有點像Activity源碼的外觀模式，內部的分工和職責劃分對於使用者是不可見的。

最後在主工程啓動插件：

Intent intent = new Intent();
intent.putExtra(Constants.PACKAGE_NAME, PLUGIN_PACKAGE_NAME);
intent.putExtra(Constants.PLUGIN_CLASS_NAME, PLUGIN_CLAZZ_NAME);
mPluginManager.startActivity(intent);

插件Activity以下：

public class MainActivity extends PluginActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("Plugin App");
        ((ImageView) findViewById(R.id.iv_logo)).setImageResource(R.drawable.android);
    }
}

效果：

Hook實現

Hook的方式須要基本瞭解系統啓動一個Activity的過程，通常來講系統會先檢查Activity是否註冊，而後再去生成該Activity，那麼咱們只須要在檢查的時候用一個已經註冊的Activity（樁，一般表示爲StubActivity）來給系統檢查，檢查經過後在生成的時候再替換成插件的就能夠了。

首先要本身實現一個Instrumentation，在裏面作一些替換工做，而後去Hook掉系統持有的對象：

public class HookedInstrumentation extends Instrumentation implements Handler.Callback {
    public static final String TAG = "HookedInstrumentation";
    protected Instrumentation mBase;
    private PluginManager mPluginManager;

    public HookedInstrumentation(Instrumentation base, PluginManager pluginManager) {
        mBase = base;
        mPluginManager = pluginManager;
    }

    /**
     * 覆蓋掉原始Instrumentation類的對應方法,用於插件內部跳轉Activity時適配
     *
     * @Override
     */
    public ActivityResult execStartActivity(
            Context who, IBinder contextThread, IBinder token, Activity target,
            Intent intent, int requestCode, Bundle options) {

        if (Constants.DEBUG) Log.e(TAG, "execStartActivity");
        mPluginManager.hookToStubActivity(intent);

        try {
            Method execStartActivity = Instrumentation.class.getDeclaredMethod(
                    "execStartActivity", Context.class, IBinder.class, IBinder.class,
                    Activity.class, Intent.class, int.class, Bundle.class);
            execStartActivity.setAccessible(true);
            return (ActivityResult) execStartActivity.invoke(mBase, who,
                    contextThread, token, target, intent, requestCode, options);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("do not support!!!" + e.getMessage());
        }
    }

    @Override
    public Activity newActivity(ClassLoader cl, String className, Intent intent) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
        if (Constants.DEBUG) Log.e(TAG, "newActivity");

        if (mPluginManager.hookToPluginActivity(intent)) {
            String targetClassName = intent.getComponent().getClassName();
            PluginApp pluginApp = mPluginManager.getLoadedPluginApk();
            Activity activity = mBase.newActivity(pluginApp.mClassLoader, targetClassName, intent);
            activity.setIntent(intent);
            ReflectUtil.setField(ContextThemeWrapper.class, activity, Constants.FIELD_RESOURCES, pluginApp.mResources);
            return activity;
        }

        if (Constants.DEBUG) Log.e(TAG, "super.newActivity(...)");
        return super.newActivity(cl, className, intent);
    }

    @Override
    public boolean handleMessage(Message message) {
        if (Constants.DEBUG) Log.e(TAG, "handleMessage");
        return false;
    }


    @Override
    public void callActivityOnCreate(Activity activity, Bundle icicle) {
        if (Constants.DEBUG) Log.e(TAG, "callActivityOnCreate");
        super.callActivityOnCreate(activity, icicle);
    }
}

在負責啓動的execStartActivity設置爲啓動已註冊的Activity，再在newActivity設置爲實際要啓動的插件的Activity。而後去Hook系統持有的該字段：

public class ReflectUtil {
    public static final String METHOD_currentActivityThread = "currentActivityThread";
    public static final String CLASS_ActivityThread = "android.app.ActivityThread";
    public static final String FIELD_mInstrumentation = "mInstrumentation";
    public static final String TAG = "ReflectUtil";


    private static Instrumentation sInstrumentation;
    private static Instrumentation sActivityInstrumentation;
    private static Field sActivityThreadInstrumentationField;
    private static Field sActivityInstrumentationField;
    private static Object sActivityThread;

    public static boolean init() {
        //獲取當前的ActivityThread對象
        Class<?> activityThreadClass = null;
        try {
            activityThreadClass = Class.forName(CLASS_ActivityThread);
            Method currentActivityThreadMethod = activityThreadClass.getDeclaredMethod(METHOD_currentActivityThread);
            currentActivityThreadMethod.setAccessible(true);
            Object currentActivityThread = currentActivityThreadMethod.invoke(null);


            //拿到在ActivityThread類裏面的原始mInstrumentation對象
            Field instrumentationField = activityThreadClass.getDeclaredField(FIELD_mInstrumentation);
            instrumentationField.setAccessible(true);
            sActivityThreadInstrumentationField = instrumentationField;

            sInstrumentation = (Instrumentation) instrumentationField.get(currentActivityThread);
            sActivityThread = currentActivityThread;


            sActivityInstrumentationField =  Activity.class.getDeclaredField(FIELD_mInstrumentation);
            sActivityInstrumentationField.setAccessible(true);
            return true;
        } catch (ClassNotFoundException
                | NoSuchMethodException
                | IllegalAccessException
                | InvocationTargetException
                | NoSuchFieldException e) {
            e.printStackTrace();
        }

        return false;
    }

    public static Instrumentation getInstrumentation() {
        return sInstrumentation;
    }

    public static Object getActivityThread() {
        return sActivityThread;
    }

    public static void setInstrumentation(Object activityThread, HookedInstrumentation hookedInstrumentation) {
        try {
            sActivityThreadInstrumentationField.set(activityThread, hookedInstrumentation);
            if (Constants.DEBUG) Log.e(TAG, "set hooked instrumentation");
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

    public static void setActivityInstrumentation(Activity activity, PluginManager manager) {
        try {
            sActivityInstrumentation = (Instrumentation) sActivityInstrumentationField.get(activity);
            HookedInstrumentation instrumentation = new HookedInstrumentation(sActivityInstrumentation, manager);
            sActivityInstrumentationField.set(activity, instrumentation);
            if (Constants.DEBUG) Log.e(TAG, "set activity hooked instrumentation");
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }


    public static void setField(Class clazz, Object target, String field, Object object) {
        try {
            Field f = clazz.getDeclaredField(field);
            f.setAccessible(true);
            f.set(target, object);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

PluginManager一樣負責加載插件的類和資源等：

public class PluginManager {
    private final static String TAG = "PluginManager";
    private static PluginManager sInstance;
    private Context mContext;
    private PluginApp mPluginApp;


    public static PluginManager getInstance(Context context) {
        if (sInstance == null && context != null) {
            sInstance = new PluginManager(context);
        }
        return sInstance;
    }

    private PluginManager(Context context) {
        mContext = context;
    }


    public void hookInstrumentation() {
        try {
            Instrumentation baseInstrumentation = ReflectUtil.getInstrumentation();

            final HookedInstrumentation instrumentation = new HookedInstrumentation(baseInstrumentation, this);

            Object activityThread = ReflectUtil.getActivityThread();
            ReflectUtil.setInstrumentation(activityThread, instrumentation);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void hookCurrentActivityInstrumentation(Activity activity) {
        ReflectUtil.setActivityInstrumentation(activity, sInstance);
    }


    public void hookToStubActivity(Intent intent) {
        if (Constants.DEBUG) Log.e(TAG, "hookToStubActivity");

        if (intent == null || intent.getComponent() == null) {
            return;
        }
        String targetPackageName = intent.getComponent().getPackageName();
        String targetClassName = intent.getComponent().getClassName();

        if (mContext != null
                && !mContext.getPackageName().equals(targetPackageName)
                && isPluginLoaded(targetPackageName)) {
            if (Constants.DEBUG) Log.e(TAG, "hook " +  targetClassName + " to " + Constants.STUB_ACTIVITY);

            intent.setClassName(Constants.STUB_PACKAGE, Constants.STUB_ACTIVITY);
            intent.putExtra(Constants.KEY_IS_PLUGIN, true);
            intent.putExtra(Constants.KEY_PACKAGE, targetPackageName);
            intent.putExtra(Constants.KEY_ACTIVITY, targetClassName);
        }
    }

    public boolean hookToPluginActivity(Intent intent) {
        if (Constants.DEBUG) Log.e(TAG, "hookToPluginActivity");
        if (intent.getBooleanExtra(Constants.KEY_IS_PLUGIN, false)) {
            String pkg = intent.getStringExtra(Constants.KEY_PACKAGE);
            String activity = intent.getStringExtra(Constants.KEY_ACTIVITY);
            if (Constants.DEBUG) Log.e(TAG, "hook " + intent.getComponent().getClassName() + " to " + activity);
            intent.setClassName(pkg, activity);
            return true;
        }
        return false;
    }

    private boolean isPluginLoaded(String packageName) {
        // TODO 檢查packageNmae是否匹配
        return mPluginApp != null;
    }



    public PluginApp loadPluginApk(String apkPath) {
        String addAssetPathMethod = "addAssetPath";
        PluginApp pluginApp = null;
        try {
            AssetManager assetManager = AssetManager.class.newInstance();
            Method addAssetPath = assetManager.getClass().getMethod(addAssetPathMethod, String.class);
            addAssetPath.invoke(assetManager, apkPath);
            Resources pluginRes = new Resources(assetManager,
                    mContext.getResources().getDisplayMetrics(),
                    mContext.getResources().getConfiguration());
            pluginApp = new PluginApp(pluginRes);
            pluginApp.mClassLoader = createDexClassLoader(apkPath);
        } catch (IllegalAccessException
                | InstantiationException
                | NoSuchMethodException
                | InvocationTargetException e) {
            e.printStackTrace();
        }
        return pluginApp;
    }

    private DexClassLoader createDexClassLoader(String apkPath) {
        File dexOutputDir = mContext.getDir("dex", Context.MODE_PRIVATE);
        return new DexClassLoader(apkPath, dexOutputDir.getAbsolutePath(),
                null, mContext.getClassLoader());

    }

    public boolean loadPlugin(String apkPath) {
        File apk = new File(apkPath);
        if (!apk.exists()) {
            return false;
        }
        mPluginApp = loadPluginApk(apkPath);
        return mPluginApp != null;
    }

    public PluginApp getLoadedPluginApk() {
        return mPluginApp;
    }
}

在MainActivity中初始化，注意Hook的時機：

public class MainActivity extends Activity implements View.OnClickListener {
    // https://zhuanlan.zhihu.com/p/33017826

    public static final boolean DEBUG = true;
    public static final String TAG = "MainActivity";

    private String mPluginPackageName = "top.vimerzhao.image";
    private String mPluginClassName = "top.vimerzhao.image.MainActivity";

    //讀寫權限
    private static String[] PERMISSIONS_STORAGE = {Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE};
    //請求狀態碼
    private static int REQUEST_PERMISSION_CODE = 1;

    private PluginManager mPluginManager;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
        initView();
        initPlugin();
    }


    private void initPlugin() {
        // !! must first
        ReflectUtil.init();

        mPluginManager = PluginManager.getInstance(getApplicationContext());
        mPluginManager.hookInstrumentation();
        mPluginManager.hookCurrentActivityInstrumentation(this);
    }

    private void initData() {
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, REQUEST_PERMISSION_CODE);
            }
        }
    }

    private void initView() {
        (findViewById(R.id.tv_launch)).setOnClickListener(this);
    }

    @Override
    protected void attachBaseContext(Context newBase) {
        super.attachBaseContext(newBase);
        // !!! 不要在此Hook,看源碼發現mInstrumentaion會在此方法後初始化
    }

    @Override
    public void onClick(View view) {
        if (Constants.DEBUG) Log.e(TAG, "click view id: " + view.getId());
        if (view.getId() == R.id.tv_launch) {
            // TODO launch plugin app
            if (mPluginManager.loadPlugin(Constants.PLUGIN_PATH)) {
                Intent intent = new Intent();
                intent.setClassName(mPluginPackageName, mPluginClassName);
                startActivity(intent);
            }
        }

    }
}

如今插件Activity不會有任何限制：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    @Override
    protected void onResume() {
        super.onResume();

    }
}

效果和上圖相似。