import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.widget.Toast;public class TimeoutTestActivity extends Activity {	private final static int TIME_OUT = 3 * 1000;	private final static int SLEEP_TIME = 2 * 1000;	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		//new TimeOutTask().execute();		new CancelSelfWhenTimeOutTask().execute();	}	private class CancelSelfWhenTimeOutTask extends AsyncTask
    
      {		private boolean done = false;		@Override		protected Void doInBackground(Void... params) {			cancelSelfWhenTimeOut();			sleep();			return null;		}		@Override		protected void onPostExecute(Void result) {			super.onPostExecute(result);			Toast.makeText(TimeoutTestActivity.this, "任务完成", Toast.LENGTH_SHORT)					.show();		}		private void cancelSelfWhenTimeOut() {			new Timer().schedule(new TimerTask() {				@Override				public void run() {					if (!done) {						CancelSelfWhenTimeOutTask.this.cancel(true);					}				}			}, TIME_OUT);		}		private void sleep() {			try {				Thread.sleep(SLEEP_TIME);				done = true;			} catch (InterruptedException e) {			}		}	}	private class TimeOutTask extends AsyncTask
     
       {		private boolean done = false;		private boolean isTimeOut = false;		@Override		protected Void doInBackground(Void... params) {			try {				throwTimeOutException();			} catch (Exception e) {				isTimeOut = true;			}			sleep();			return null;		}		@Override		protected void onPostExecute(Void result) {			super.onPostExecute(result);			if (isTimeOut) {				Toast.makeText(TimeoutTestActivity.this, "任务超时",						Toast.LENGTH_SHORT).show();			} else {				Toast.makeText(TimeoutTestActivity.this, "任务完成",						Toast.LENGTH_SHORT).show();			}		}		private void throwTimeOutException() {			new Timer().schedule(new TimerTask() {				@Override				public void run() {					if (!done) {						isTimeOut = true;					}				}			}, TIME_OUT);		}		private void sleep() {			try {				Thread.sleep(SLEEP_TIME);				done = true;			} catch (InterruptedException e) {			}		}	}}