Android 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);