timer.setText（“setTextHere”）在线程内不起作用

Question

timer.setText("setTextHere")在线程内不起作用。

Thread thread1 = new Thread(){ 

      TextView timer; 
      int t; 
      public void run(){ 
       timer=(TextView) findViewById(R.id.timer);  
       try{ 
        timer.setText("setTextHere"); 
        sleep(5000); 


       } 
       catch(Exception e){ 
        e.printStackTrace();       
       } 
       finally{ 
        Intent new1 = new Intent("com.example.app1.MENU"); 
        startActivity(new1);      
       }     
      }    
     }; 
     thread1.start(); 

Answer 1

无法从后台线程触摸UI。尝试使用的AsyncTask http://developer.android.com/reference/android/os/AsyncTask.html

Answer 2

在您的onCreate（）地址：

h = new Handler(); 

添加这个地方：

class SetText implements Runnable { 
    public void run() { 
     // do UI task 
     timer.setText("setTextHere"); 
    } 
} 

上someFunction（）修改如下：

... 
try 
{ 
    h.post(new SetText()); 
    sleep(5000); 
} 
... 

Answer 3

final TextView timer = (TextView) findViewById(R.id.timer); 
new Thread(new Runnable() { 
    public void run() { 
     try { 
      Thread.sleep(2000); 
      timer.post(new Runnable() { 
       public void run() { 
        timer.setText("setTextHere"); 
       } 
      }); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } finally { 
      Intent new1 = new Intent("com.example.app1.MENU"); 
      startActivity(new1); 
     } 
    } 
}).start(); 

Answer 4

_t = new Timer(); 
_t.scheduleAtFixedRate(new TimerTask() { 
     @Override 
     public void run() { 
      _count++; 
      runOnUiThread(new Runnable() //run on ui thread 
      { 
       public void run() 
       { 
       _tv.setText("" + _count); 
       } 
      }); 
     } 
    }, 1000, 1000); 

Answer 5

，你可以用这个和初始化线程

Thread thread1 = new Thread(){ 


     int t; 
     public void run(){  
      try{ 
       sleep(5000); 


      } 
      catch(Exception e){ 
       e.printStackTrace();       
      } 
      finally{ 
       Intent new1 = new Intent("com.example.app1.MENU"); 
       startActivity(new1);      
      }     
     }    
    }; 
    TextView timer; 
    timer=(TextView) findViewById(R.id.timer); 
    timer.setText("setTextHere"); 
    thread1.start();