Wyjątek wyjątkowego tokena menedżera okien

Question

Witam Mam do czynienia z problemem w oknie dialogowym wiadomości, zamykanie mojego kodu jest tutaj.

w Create:

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.email_result); 

    email_result = (Button) findViewById(R.id.email_result_btn); 
    email_result.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 


      if (diffdays > 365) { 

       h.sendEmptyMessage(0); 
       } 
     } 
    } 
    } 

Moja Handler:

private Handler h = new Handler() { 
    public void handleMessage(Message msg) { 
      showMessageDialog("Sorry, you cannot email entries which are earlier than one year ago."); 
    } 
}; 

ShowMessageDialog Metoda:

public void showMessageDialog(String nMessage) { 

    alertDialog = new Dialog(Email_Result.this); 
    AlertDialog.Builder customBuilder = new AlertDialog.Builder(
      Email_Result.this); 
    customBuilder.setMessage(nMessage); 
    customBuilder.setPositiveButton(getString(R.string.ok), 
      new DialogInterface.OnClickListener() { 
       public void onClick(DialogInterface dialog, int which) { 
        alertDialog.dismiss(); 
       } 
      }); 
    alertDialog = customBuilder.create(); 
    alertDialog.setCancelable(true); 
    alertDialog.show(); 
} 

Error Log

01-11 12:08:24.470: ERROR/AndroidRuntime(325): FATAL EXCEPTION: main 
01-11 12:08:24.470: ERROR/AndroidRuntime(325): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44f1dfd8 is not valid; is your activity running? 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.view.ViewRoot.setView(ViewRoot.java:505) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.view.Window$LocalWindowManager.addView(Window.java:424) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.app.Dialog.show(Dialog.java:241) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at com.stress1.Email_Result.showMessageDialog(Email_Result.java:207) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at com.stress1.Email_Result$2.onClick(Email_Result.java:81) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.view.View.performClick(View.java:2408) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.view.View$PerformClick.run(View.java:8816) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.os.Handler.handleCallback(Handler.java:587) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.os.Handler.dispatchMessage(Handler.java:92) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.os.Looper.loop(Looper.java:123) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at java.lang.reflect.Method.invoke(Method.java:521) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
01-11 12:08:24.470: ERROR/AndroidRuntime(325):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Wygląda na to, że wyjątek występuje po wywołaniu metody show() w oknie dialogowym. Spróbuj użyć następującego kodu, który mógłby obejście problemu:

try { 
     alertDialog.show(); 
} catch(Exception e){ 
    // WindowManager$BadTokenException will be caught and the app would not display 
    // the 'Force Close' message 
} 

Taki problem pojawia się, gdy aktywność próbuje wyświetlić AlertDialog po to został już zakończony. Warto więc przyjrzeć się bliżej, jak działa Twój kod.

Również metoda showMessageDialog może zostać uproszczona w następujący sposób: (! IsFinishing)

public void showMessageDialog(String nMessage) { 

    AlertDialog.Builder customBuilder = new AlertDialog.Builder(Email_Result.this); 
    customBuilder.setMessage(nMessage); 
    customBuilder.setPositiveButton(getString(R.string.ok),new DialogInterface.OnClickListener(){ 
     @Override    
     public void onClick(DialogInterface dialog, int which) { 
       dialog.dismiss(); 
     } 
    }); 
    customBuilder.setCancelable(true); 
    customBuilder.show(); 
} 

Answer 2

Wystarczy dodać, jeśli w kodzie tak:

private Handler h = new Handler() { 
    public void handleMessage(Message msg) { 
      if(!isFinishing) 
      showMessageDialog("Sorry, you cannot email entries which are earlier than one year ago."); 
    } 
};