ProgressDialog et AsyncTask à un comportement anormal échoue

Question

J'ai un AsyncTasc qui tourne de ProgressDialog, tout fonctionne très bien, mais après un certain temps de comportement anormal échoue. Je sais, cet utilisateur ne se comportera jamais ainsi. Mais pour un bon test est nécessaire de tout essayer.

code:

import android.os.AsyncTask; 
import android.os.Bundle; 
import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.DialogInterface; 
import android.content.DialogInterface.OnCancelListener; 
import android.util.Log; 
import android.view.Menu; 
import android.view.View; 

public class MainActivity extends Activity { 
    ProgressDialog mProgressDialog; 
    GetSubs gs; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     mProgressDialog = new ProgressDialog(MainActivity.this); 
     mProgressDialog.setMessage("Loading..."); 
     mProgressDialog.setIndeterminate(false); 
     mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
     mProgressDialog.setOnCancelListener(new OnCancelListener() { 

      @Override 
      public void onCancel(DialogInterface dialog) { 
       Log.d("Called on Cancel", " Listener"); 
       gs.cancel(false); 
      } 
     }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    public void Clicked(View view) { 
     gs = new GetSubs(); 
     gs.execute(); 
    } 

    public class GetSubs extends AsyncTask<Void, Void, String> { 

     @Override 
     protected void onPreExecute() { 
      // TODO Auto-generated method stub 
      super.onPreExecute(); 
      mProgressDialog.show(); 
      Log.d("onPreExecute", " in AsyncTasc"); 
     } 

     @Override 
     protected String doInBackground(Void... params) { 
      for (int i = 0; i < 5; i++) { 
       try { 
        Thread.sleep(2000); 
       } catch (InterruptedException e) { 
        e.printStackTrace(); 
       } 
       if (isCancelled()) break; 
      } 
      return null; 
     } 

     @Override 
     protected void onCancelled() { 
      // TODO Auto-generated method stub 
      super.onCancelled(); 
      Log.d("onCancelled", " in AsyncTasc"); 
     } 

     @Override 
     protected void onPostExecute(String result) { 
      super.onPostExecute(result); 
      mProgressDialog.dismiss(); 
      Log.d("onPostExecute", " in AsyncTasc"); 

     } 

    } 

} 

Logcat:

04-16 21:14:21.053: E/AndroidRuntime(28767): FATAL EXCEPTION: main 
04-16 21:14:21.053: E/AndroidRuntime(28767): java.lang.IllegalArgumentException: View not attached to window manager 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:751) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:474) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.view.WindowManagerImpl$CompatModeWrapper.removeView(WindowManagerImpl.java:163) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.app.Dialog.dismissDialog(Dialog.java:348) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.app.Dialog$1.run(Dialog.java:139) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.app.Dialog.dismiss(Dialog.java:333) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at com.example.getusersubs.MainActivity$GetSubs.onPostExecute(MainActivity.java:82) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at com.example.getusersubs.MainActivity$GetSubs.onPostExecute(MainActivity.java:1) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.os.AsyncTask.finish(AsyncTask.java:602) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.os.AsyncTask.access$600(AsyncTask.java:156) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.os.Looper.loop(Looper.java:154) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at android.app.ActivityThread.main(ActivityThread.java:4945) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at java.lang.reflect.Method.invokeNative(Native Method) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at java.lang.reflect.Method.invoke(Method.java:511) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
04-16 21:14:21.053: E/AndroidRuntime(28767): at dalvik.system.NativeStart.main(Native Method) 

Qu'est-ce qui ne va pas? Merci pour les réponses

Answer 1

changement:

 @Override 
    protected void onPostExecute(String result) { 
     super.onPostExecute(result); 
     mProgressDialog.dismiss(); 
     Log.d("onPostExecute", " in AsyncTasc"); 

    } 

à

@Override 
    protected void onPostExecute(String result) { 
     super.onPostExecute(result); 
     if(mProgressDialog != null && mProgressDialog.isShowing()){ 
       mProgressDialog.dismiss(); 
     } 
     Log.d("onPostExecute", " in AsyncTasc"); 

    } 

Le problème est que vous essayez de rejeter un progrès Dialoguer sans vérifier si elle montre ou non, l'utilisateur peut annuler ce dialogue facilement en appuyant sur backKey.

Vous pouvez toujours forcer l'utilisateur à attendre la boîte de dialogue en définissant Cancellable sur false. De cette façon, la touche de retour n'aura aucun effet.