Android - DialogFragment從片段中顯示。當DialogFragment被解僱時如何從片段中顯示Toast？

Question

正如問題所述..

我有一個片段，我創建並顯示一個DialogFragment，並設置targetFragment，這是當前的片段。

DialogFragment_Progress fragmentProgressBar = new DialogFragment_Progress();   
    fragmentProgressBar.setTargetFragment(this, 0); 
    fragmentProgressBar.show(getFragmentManager(), null); 

我做一些進度條更新

// Thread that controls progress bar 
final Thread progressThread = new Thread() 
{ 
    @Override 
    public void run() 
    {   
     active = true; 
     int cumulativetime = 0; 

     try 
     { 
      while (active && cumulativetime < TIME_TOTAL) 
      { 
       sleep(TIME_INTERVAL); 

       if (active) 
       { 
        cumulativetime += TIME_INTERVAL; 

        updateProgress(cumulativetime); 
       } 
      } 
     } 
     catch (InterruptedException e) 
     { 

     } 
     finally 
     { 
      onContinue(); 
     } 
    } 
}; 

當壞進度完成時，我嘗試調用一個方法在目標片段顯示吐司。該onContinue（）代碼和方法的調用targetFragment可以看到下面..

// Perform final operations 
public void onContinue() 
{  
    Fragment_Activate_Program_Specific targetFragment = (Fragment_Activate_Program_Specific) getTargetFragment(); 

    targetFragment.operationComplete(); 

    dismiss(); 
} 

操作完成..

// Operation complete 
public void operationComplete() 
{  
    Toast.makeText(getActivity(), "Herp", Toast.LENGTH_SHORT).show(); 

    Log.i("Hello: ", "Got here!"); 
} 

當我不嘗試和烤麪包片，一切都很好，在記錄已收到。在沒有涉及UI的情況下，這種方法已經爲我多次工作了。

問題：當operationComplete（）在targetFragment（）被調用時，我得到下面的異常..

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

相關的堆棧跟蹤..

05-31 12:21:53.024: W/dalvikvm(28494): threadid=13: thread exiting with uncaught exception (group=0x40cc9930) 
05-31 12:21:53.034: E/AndroidRuntime(28494): FATAL EXCEPTION: Thread-14251 
05-31 12:21:53.034: E/AndroidRuntime(28494): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 
05-31 12:21:53.034: E/AndroidRuntime(28494): at android.os.Handler.<init>(Handler.java:197) 
05-31 12:21:53.034: E/AndroidRuntime(28494): at android.os.Handler.<init>(Handler.java:111) 
05-31 12:21:53.034: E/AndroidRuntime(28494): at android.widget.Toast$TN.<init>(Toast.java:324) 
05-31 12:21:53.034: E/AndroidRuntime(28494): at android.widget.Toast.<init>(Toast.java:91) 
05-31 12:21:53.034: E/AndroidRuntime(28494): at android.widget.Toast.makeText(Toast.java:238) 
05-31 12:21:53.034: E/AndroidRuntime(28494): at com.mypackage.Activity_Activate_Program.activateOperationComplete(Activity_Activate_Program.java:90) 

我已經嘗試使用父活動，而不是調用片段來承載operationComplete（）方法，但我得到相同的錯誤。

任何想法？

Answer 1

敬酒應該從UI線程調用。

試試這個。

public void operationComplete() 
{  
    getActivity().runOnUiThread(new Runnable() { 
     @Override 
     public void run() { 
      Toast.makeText(getActivity(), "Herp", Toast.LENGTH_SHORT).show(); 
     } 
    }); 


    Log.i("Hello: ", "Got here!"); 
} 

Answer 2

您可以簡單地重寫Dialog片段的dismiss方法，這將只調用一個。

@Override 
Public void dismiss() { 
    Log.e(TAG,"dismiss"; 
    super.dismiss(); 
}