Android App - 計時器

admin

以下例子TextView1 會顯示數字, 由0 開始每秒加一

1.    Timer t = new Timer();
   
2.     int time=0;
   
3. 
   
4.     @Override
   
5.     public void onCreate(Bundle savedInstanceState) {
   
6.         super.onCreate(savedInstanceState);
   
7.         setContentView(R.layout.main);
   
8.         mContext = this;
   
9.   t.scheduleAtFixedRate(new TimerTask() {
   
10.   @Override
    
11.   public void run() {
    
12.   runOnUiThread(new Runnable() {
    
13.      public void run() {
    
14.             TextView tv = (TextView) findViewById(R.id.textView1);
    
15.             tv.setText(String.valueOf(time));
    
16.             time += 1;
    
17.         }         
    
18.     });
    
19.         //Called each time when 1000 milliseconds (1 second) (the period parameter)
    
20.     }        
    
21. },
    
22. //Set how long before to start calling the TimerTask (in milliseconds)
    
23. 0,
    
24. //Set the amount of time between each execution (in milliseconds)
    
25. 1000);
    
26. }

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admin

採用Timer 其中一個問題是不能隨時 enable 及disable timer, 我們可以採用 handle 做計時器

admin

或者把上面程式以 method 處理

1. Timer t = new Timer();
   
2.    int time=0;
   
3. 
   
4.     @Override
   
5.     public void onCreate(Bundle savedInstanceState) {
   
6.         super.onCreate(savedInstanceState);
   
7.         setContentView(R.layout.main);
   
8.         mContext = this;
   
9.           t.scheduleAtFixedRate(new TimerTask() {
   
10. 
    
11. @Override
    
12. public void run() {              TimerMethod();
    
13.          }        
    
14.       },                    //Set how long before to start calling the TimerTask (in milliseconds)
    
15.       0,                //Set the amount of time between each execution (in milliseconds)
    
16.      1000);
    
17. }
    
18. 
    
19. private void TimerMethod()
    
20. {
    
21. //This method is called directly by the timer
    
22. //and runs in the same thread as the timer.
    
23. //We call the method that will work with the UI
    
24. //through the runOnUiThread method.
    
25. 
    
26. this.runOnUiThread(Timer_Tick);
    
27. }
    
28. 
    
29. private Runnable Timer_Tick = new Runnable() {
    
30. public void run() {
    
31. //This method runs in the same thread as the UI.   
    
32.      TextView tv = (TextView) findViewById(R.id.textView2);
    
33.     tv.setText(String.valueOf(time));
    
34.     time += 1;
    
35.    }
    
36. };

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