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@mSolo 2015-04-23T09:51:08.000000Z 字数 3233 阅读 1698

Android 知识碎片笔记（三）

Android

11. Binder

12. Messenger

  1. public void onServiceConnected(ComponentName name, IBinder service) {    
  2.     mMessenger = new Messenger(service);  　　　　
  3.     // ...... 
  4.  }  
  1. public class WorkerThreadService extends Service {
  2.     WorkerThread mWorkerThread;
  3.     Messenger mWorkerMessenger;
  4.     @Override
  5.     public void onCreate() {
  6.         super.onCreate();
  7.         mWorkerThread.start(); 
  8.     }
  9.     /**
  10.     * Worker thread has prepared a looper and handler.
  11.     **/
  12.     private void onWorkerPrepared() {
  13.         mWorkerMessenger = new Messenger(mWorkerThread.mWorkerHandler); 
  14.     }
  15.     public IBinder onBind(Intent intent) { 
  16.         return mWorkerMessenger.getBinder();
  17.     }
  18.     @Override
  19.     public void onDestroy() {
  20.         super.onDestroy();
  21.         mWorkerThread.quit();
  22.     }
  23.     private class WorkerThread extends Thread {
  24.         Handler mWorkerHandler;
  25.         @Override
  26.         public void run() {
  27.             Looper.prepare();
  28.             mWorkerHandler = new Handler() {
  29.                 @Override
  30.                 public void handleMessage(Message msg) { 
  31.                     // Implement message processing
  32.                 }
  33.             };
  34.             onWorkerPrepared();
  35.             Looper.loop();
  36.         }
  37.         public void quit() {
  38.             mWorkerHandler.getLooper().quit();
  39.         }
  40.     }
  41. }
  1. public void onSendClick(View v) {
  2.     if (mBound) {
  3.         try {
  4.             Message msg = Message.obtain(null, 1, 0, 0);
  5.             msg.replyTo = new Messenger(new Handler() { 
  6.                 @Override
  7.                 public void handleMessage(Message msg) {
  8.                     Log.d(TAG, "Message sent back - msg.what = " + msg.what);
  9.                 }
  10.             });
  11.             mRemoteService.send(msg);
  12.         } catch (RemoteException e) {
  13.            Log.e(TAG, e.getMessage());
  14.         }
  15.     }
  16. }
  18. // remote service
  19. public void run() {
  20.     Looper.prepare();
  21.     mWorkerHandler = new Handler() {
  22.         @Override
  23.         public void handleMessage(Message msg) {
  24.             switch (msg.what) {
  25.                 case 1:
  26.                     try {
  27.                         msg.replyTo.send(Message.obtain(null, msg.what, 0, 0));
  28.                     } catch (RemoteException e) {
  29.                         Log.e(TAG, e.getMessage());
  30.                     }
  31.                     break;
  32.                 }
  33.             }
  34.         };
  35.         onWorkerPrepared();
  36.         Looper.loop();
  37.     }
  38. }

13. 理解 VSYNC

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