Android Timer 更好方法

Android 的Timer 一般如下面所写

Java代码

1. Timer timer = new Timer();
2. TimerTask task = new TimerTask() {
3. public void run() {
4. Message message = new Message();
5. message.what = 1;
6. handler.sendMessage(message);
8. }
10. };

Java代码

1. final Handler handler = new Handler() {
3. public void handleMessage(Message msg) {
4. switch (msg.what) {
5. case 1:
6. Log.e("Timer", "Timer");
7. update();
8. break;
9. }
10. super.handleMessage(msg);
11. }
13. };

Java代码

1. protected void onDestroy() {
2. if (timer != null) {
3. timer.cancel();
4. timer = null;
5. }
6. super.onDestroy();
7. }

最重要一点是timer.schedule(task, 1000, 5000);如果设置为timer.schedule(task, 5000)是不会工作的。

Java代码

1. protected void onCreate(Bundle savedInstanceState) {
2. super.onCreate(savedInstanceState);
3. this.setContentView(R.layout.main);
4. timer.schedule(task, 1000, 5000);
5. }

但更好的方法是通过下面的代码

Java代码

1. private Handler handler = new Handler();
3. private Runnable runnable = new Runnable() {
5. public void run() {
6. update();
7. handler.postDelayed(this, 1000);
8. }
10. };

开始Timer

Java代码

1. handler.postDelayed(runnable, 1000);

停止Timer

Java代码

1. handler.removeCallbacks(runnable);