插件化设计二-白红宇

FragmentActivity代理实现？插件化设计一主要演示插件化来发整体架构设计（代理模式 - 静态代理）

首先分析角色： 目标接口：IPlugin目标接口 目标对象：PluginFragmentActivity（继承FragmentActivity） 代理对象：ProxyPluginFragmentActivity（自定义的FragmentActivity） 第一步：PluginFragmentActivity目标对象具体的功能复制代码

//代理实现类public class ProxyImpl {	private static final String TAG = ProxyImpl.class.getSimpleName();	private String mClass;	private String mPackageName;	private PluginPackageInfo mPluginPackage;	private PluginManager mPluginManager;	private AssetManager mAssetManager;	private Resources mResources;	private Theme mTheme;	private ActivityInfo mActivityInfo;	private Activity mProxyActivity;	protected IPlugin mPluginActivity;	public ClassLoader mPluginClassLoader;	public ProxyImpl(Activity activity) {		mProxyActivity = activity;	}	private void initActivityInfo() {		PackageInfo packageInfo = mPluginPackage.packageInfo;		if ((packageInfo.activities != null)				&& (packageInfo.activities.length > 0)) {			if (mClass == null) {				mClass = packageInfo.activities[0].name;			}			// Finals 修复主题BUG			int defaultTheme = packageInfo.applicationInfo.theme;			for (ActivityInfo a : packageInfo.activities) {				if (a.name.equals(mClass)) {					mActivityInfo = a;					// Finals ADD 修复主题没有配置的时候插件异常					if (mActivityInfo.theme == 0) {						if (defaultTheme != 0) {							mActivityInfo.theme = defaultTheme;						} else {							if (Build.VERSION.SDK_INT >= 14) {								mActivityInfo.theme = android.R.style.Theme_DeviceDefault;							} else {								mActivityInfo.theme = android.R.style.Theme;							}						}					}				}			}		}	}	private void handleActivityInfo() {		Log.d(TAG, "handleActivityInfo, theme=" + mActivityInfo.theme);		if (mActivityInfo.theme > 0) {			mProxyActivity.setTheme(mActivityInfo.theme);		}		Theme superTheme = mProxyActivity.getTheme();		mTheme = mResources.newTheme();		mTheme.setTo(superTheme);		// Finals适配三星以及部分加载XML出现异常BUG		try {			mTheme.applyStyle(mActivityInfo.theme, true);		} catch (Exception e) {			e.printStackTrace();		}	}	public void onCreate(Intent intent) {		intent.setExtrasClassLoader(PluginConfigs.sPluginClassloader);		mPackageName = intent.getStringExtra(PluginConstants.EXTRA_PACKAGE);		mClass = intent.getStringExtra(PluginConstants.EXTRA_CLASS);		Log.d(TAG, "mClass=" + mClass + " mPackageName=" + mPackageName);		mPluginManager = PluginManager.getInstance(mProxyActivity);		mPluginPackage = mPluginManager.getPackage(mPackageName);		mAssetManager = mPluginPackage.assetManager;		mResources = mPluginPackage.resources;		initActivityInfo();		handleActivityInfo();		launchTargetActivity();	}	/**	 * 启动插件程序（实际上是启动代理对象Activity）	 */	protected void launchTargetActivity() {		try {			// 加载插件程序(说白了mClass就是PluginActivity)			Class
     localClass = getClassLoader().loadClass(mClass);			Constructor
     localConstructor = localClass					.getConstructor(new Class[] {});			Object instance = localConstructor.newInstance(new Object[] {});			mPluginActivity = (IPlugin) instance;            /**             * 在调用目标对象的时候，我们的代理对象持有目标对象的引用             */			((IAttachable) mProxyActivity).attach(mPluginActivity,					mPluginManager);			Log.d(TAG, "instance = " + instance);			// attach the proxy activity and plugin package to the			// mPluginActivity			// 插件程序传入代理对象			mPluginActivity.attach(mProxyActivity, mPluginPackage);            /**             * 明确了PluginActivityon Create()  判断当前这个Activity是主程序的Activity。还是插件程序的Activity             */			Bundle bundle = new Bundle();			bundle.putInt(PluginConstants.FROM, PluginConstants.FROM_EXTERNAL);			mPluginActivity.onCreate(bundle);		} catch (Exception e) {			e.printStackTrace();		}	}	public ClassLoader getClassLoader() {		return mPluginPackage.classLoader;	}	public AssetManager getAssets() {		return mAssetManager;	}	public Resources getResources() {		return mResources;	}	public Theme getTheme() {		return mTheme;	}	public IPlugin getRemoteActivity() {		return mPluginActivity;	}}复制代码

Activity可以被实例化但是系统就不会进行管理（生命周期）

第一步：PluginFragmentActivity目标对象具体的功能第二步：ProxyPluginFragmentActivity代理对象具体功能实现

3.Apk动态解析加载流程原理分析？第一步：主程序加载插件程序第二步：主程序启动插件流程分析