每秒更改TextView值（Android）

我正在創建示例應用程序，我希望每秒更改一次TextVeiw值。每秒更改TextView值（Android）

TextView的值應該每秒更改一次。

來執行這項任務我想這下面的代碼：

但是這個代碼不改變文本值繼續，它只是改變應用程序啓動或旋轉屏幕。

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.fragment_main); 

Boolean b = true; 

     final TextView tv = (TextView) this.findViewById(R.id.textView1); 

     final String[] str = new String[] { "897451", "34232", "33432", 
       "46867", "54554", "6756", "56r7", "2345u8", "9654", "987650", }; 
     Random generator = new Random(); 
     final int random = generator.nextInt(str.length); 

     Thread t = new Thread() { 

      @Override 
      public void run() { 
       try { 
        while (b != false) { 
         Thread.sleep(1000); 
         runOnUiThread(new Runnable() { 
          @Override 
          public void run() { 
           // update TextView here! 
           tv.setText(str[random]); 
          } 
         }); 
        } 
       } catch (InterruptedException e) { 
       } 
      } 
     }; 
     t.start(); 

    }

，我也嘗試這種代碼：但是這個代碼崩潰的應用程序

private Timer timer = new Timer(); 
    private TimerTask timerTask; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.fragment_main); 

     final TextView tv = (TextView) this.findViewById(R.id.textView1); 

     final String[] str = new String[] { "897451", "34232", "33432", 
       "46867", "54554", "6756", "56r7", "2345u8", "9654", "987650", }; 
     Random generator = new Random(); 
     final int random = generator.nextInt(str.length); 

     timerTask = new TimerTask() { 
     @Override 
     public void run() { 
     // refresh your textview 
     tv.setText(str[random]); 
     } 
     }; 
     timer.schedule(timerTask, 0, 1000); 
}

來源

2014-12-13 xyz question

試試下面的代碼片段

final Handler h = new Handler(); 
    h.post(new Runnable() { 
     @Override 
     public void run() { 

      long millis =(long)currentTime(); 


      dateAndTime.setText(getDate(millis, "dd/MM/yyyy hh:mm:ss.SSS")); 

      h.postDelayed(this, 1000); 
     } 
    });

來源

2014-12-13 10:32:16

final TextView tv = (TextView) this.findViewById(R.id.textView1); 

     final String[] str = new String[] { "897451", "34232", "33432", 
       "46867", "54554", "6756", "56r7", "23458", "9654", "987650", }; 

     // // 
     final Handler h = new Handler(); 
     h.post(new Runnable() { 
     @Override 
     public void run() { 
     Random generator = new Random(); 
     final int random = generator.nextInt(str.length); 
     tv.setText(str[random]); 
     h.postDelayed(this, 1000); 
     } 
     }); 
     // //

來源

2014-12-13 11:13:27

每秒更改TextView值（Android）

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