Handler ThreadHandler 同步与异步

mHandle.post(new Runnable() {
			
			@Override
			public void run() {
				for (int i = 0; i < 10; i++) {
					Log.i(TAG, "XXXX " + i);
				}
			}
		});
		
		try {
			Thread.sleep(1000 * 10);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		Log.i(TAG, "onCreate end....");

执行结果：

04-29 22:24:34.040: I/HandleActivity(6660): main
04-29 22:24:34.040: I/HandleActivity(6660): onCreate end....
04-29 22:24:34.080: I/HandleActivity(6660): main
04-29 22:24:34.080: I/HandleActivity(6660): XXXX 0
04-29 22:24:34.080: I/HandleActivity(6660): XXXX 1
04-29 22:24:34.080: I/HandleActivity(6660): XXXX 2

说明 onCreate 跟 mHandler post的是同一个线程。即UI线程 也就是主线程

	HandlerThread mHandlerThread = new HandlerThread("HandlerThread");
		mHandlerThread.start();
		
		final Handler mHandler = new Handler(mHandlerThread.getLooper()) {
			public void handleMessage(android.os.Message msg) {
				Log.i(TAG, "Msg --- " + msg + " " + Thread.currentThread().getName());
			};
		};

		mHandler.post(new Runnable() {

			@Override
			public void run() {
				for (int i = 0; i < 3; i++) {
					Log.i(TAG, "XXXX " + i + " " + Thread.currentThread().getName());
					mHandler.sendEmptyMessage(i);
				}
			}
		});

		try {
			Thread.sleep(1000 * 3);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		Log.i(TAG, "onCreate end...." + Thread.currentThread().getName());

采用HandlerThread执行情况如下：

04-30 00:10:13.785: I/HandleActivity(9067): XXXX 1 HandlerThread
04-30 00:10:13.785: I/HandleActivity(9067): XXXX 2 HandlerThread
04-30 00:10:13.785: I/HandleActivity(9067): Msg --- { what=0 when=-1ms } HandlerThread
04-30 00:10:13.785: I/HandleActivity(9067): Msg --- { what=1 when=-4ms } HandlerThread
04-30 00:10:13.795: I/HandleActivity(9067): Msg --- { what=2 when=-4ms } HandlerThread
04-30 00:10:16.798: I/HandleActivity(9067): onCreate end....main