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標題: Android App - 計時器 [打印本頁]
作者: admin    時間: 2013-8-24 17:09     標題: Android App - 計時器

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;

  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. }
複製代碼
作者: admin    時間: 2013-8-24 17:38

或者把上面程式以 method 處理

  1. Timer t = new Timer();
  2.    int time=0;

  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() {

  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. }

  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.

  26. this.runOnUiThread(Timer_Tick);
  27. }

  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. };
複製代碼
作者: admin    時間: 2013-9-9 20:50

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



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