setText進入循環不起作用setVisibility也不是

Question

.setText在for循環中不起作用。 而setVisibility setAlphabet（） 對不起，我的英語結束後只是工作...

private ImageButton playTeste1; 
private TextView alfabeto; 

public void setListeners(){ 
    playTeste1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      playTeste1.setVisibility(View.INVISIBLE); 
      alfabeto.setVisibility(View.VISIBLE); 
      setAlphabet(); 
     } 
    }); 



public void setAlphabet(){ 
     try{ 
      String temp; 
      for(char alphabet = 'A'; alphabet <= 'Z';alphabet++) { 
      System.out.println(alphabet); 
      temp = String.valueOf(alphabet); 
      alfabeto.setText(temp); 
      Thread.sleep(1000); 
     } 
     }catch (InterruptedException e) { 
       System.out.println("error in Thread"); 
      } 
    } 

Answer 1

也許問題是，你是不是在UI線程。在這種情況下，您應該嘗試在runOnUIThread方法中設置文本。

public void setAlphabet(){ 
    try{ 
     String temp; 
     for(char alphabet = 'A'; alphabet <= 'Z';alphabet++) { 
     System.out.println(alphabet); 
     temp = String.valueOf(alphabet); 
     try { 
       // code runs in a thread 
       runOnUiThread(new Runnable() { 
         @Override 
         public void run() { 
          alfabeto.setText(temp); 
         } 
       }); 
      } catch (final Exception ex) { 
       Log.i("---","Exception in thread"); 
      } 
     Thread.sleep(1000); 
    } 
    }catch (InterruptedException e) { 
      System.out.println("error in Thread"); 
     } 
} 

runOnUIThread方法必須在Activity類或Activity對象（或其子類）中調用。