Android(安卓)Timer 更好方法

Android 的Timer 一般如下面所写

Java代码
Timer timer = new Timer();
TimerTask task = new TimerTask() {
public void run() {
Message message = new Message();
message.what = 1;
handler.sendMessage(message);

}

};

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

}

};

Java代码
final Handler handler = new Handler() {

public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
Log.e("Timer", "Timer");
update();
break;
}
super.handleMessage(msg);
}

};

final Handler handler = new Handler() {

public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
Log.e("Timer", "Timer");
update();
break;
}
super.handleMessage(msg);
}

};

Java代码
protected void onDestroy() {
if (timer != null) {
timer.cancel();
timer = null;
}
super.onDestroy();
}

protected void onDestroy() {
if (timer != null) {
timer.cancel();
timer = null;
}
super.onDestroy();
}

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

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

但更好的方法是通过下面的代码

Java代码
private Handler handler = new Handler();

private Runnable runnable = new Runnable() {

public void run() {
update();
handler.postDelayed(this, 1000);
}

};

private Handler handler = new Handler();

private Runnable runnable = new Runnable() {

public void run() {
update();
handler.postDelayed(this, 1000);
}

};

开始Timer

Java代码
handler.postDelayed(runnable, 1000);

handler.postDelayed(runnable, 1000);

停止Timer

Java代码
handler.removeCallbacks(runnable);

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