Android计时器

(TimerTask
+ Handler)

通过配合Handler来实现timer功能的！

public class TestTimer extends Activity {

Timer timer = new Timer();
Handler handler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
setTitle("hear me?");
break;
}
super.handleMessage(msg);
}

};

TimerTask task = new TimerTask(){
public void run() {
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
};

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

timer.schedule(task, 10000);
}
}

( Runnable
+ Handler.postDelayed(runnable,time) )

在Android里定时更新
UI，通常使用的是 java.util.Timer, java.util.TimerTask,
android.os.Handler组合。实际上Handler
自身已经提供了定时的功能。 

private Handler handler = new Handler();

private Runnable myRunnable= new Runnable() {
public void run() {
handler.postDelayed(this, 1000);
count++;
tvCounter.setText("Count: " + count);

}
};

然后在其他地方调用

handler.post(myRunnable);