AlertDialog在AndEngine

Question

我試圖表現出alertdialog但我不斷收到此錯誤

01-24 21:52:45.640: E/AndroidRuntime(31119): FATAL EXCEPTION: UpdateThread 
01-24 21:52:45.640: E/AndroidRuntime(31119): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 
01-24 21:52:45.640: E/AndroidRuntime(31119): at android.os.Handler.<init>(Handler.java:121) 
01-24 21:52:45.640: E/AndroidRuntime(31119): at android.app.Dialog.<init>(Dialog.java:100) 
01-24 21:52:45.640: E/AndroidRuntime(31119): at android.app.AlertDialog.<init>(AlertDialog.java:96) 
01-24 21:52:45.640: E/AndroidRuntime(31119): at android.app.AlertDialog$Builder.create(AlertDialog.java:891) 

它是指向該行

@Override 
protected Dialog onCreateDialog(int id) { 
    switch (id) { 
    case 1: 
     isGameRunning = false; 
     gameStarted = false; 
     mEngine.stop(); 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setTitle("How To Play"); 
     builder.setIcon(R.drawable.ic_launcher); 



     final AlertDialog alert = builder.create(); //this line 

     builder.setPositiveButton("Thanks", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int id) { 
      alert.dismiss(); 
      isGameRunning = true; 
      mEngine.start(); 
      gameStarted = true; 

     } 
     }); 
     return alert; 
    default: 
     return null; 
    }  

}

Answer 1

這似乎是，由於某種原因，米從AndEngine的UpdateThread調用方法onCreateDialog（雖然它應該從UI線程中調用）。

請記住，當您顯示對話框時，請致電showDialog(int id)而不是onCreateDialog(int id)。致電showDialog後，Android會盡可能在UI線程上調用onCreateDialog。

實際上，我現在查看了showDialog信息，它已被棄用，它看起來像有一種全新的創建對話框的方式。閱讀更多here。

Answer 2

試試這個

@Override 
protected Dialog onCreateDialog(int id) { 
    switch (id) { 
    case 1: 
     isGameRunning = false; 
     gameStarted = false; 
     mEngine.stop(); 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setTitle("How To Play") 
       .setIcon(R.drawable.ic_launcher) 
       .setPositiveButton("Thanks", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int id) { 
      isGameRunning = true; 
      mEngine.start(); 
      gameStarted = true; 

     } 
     }); 
     return builder.create(); 
    default: 
     return null; 
    }  
} 

Answer 3

調用來自UIThread的showDialog。

this.runOnUiThread(new Runnable() { 
    @Override 
    public void run() { 
     MyActivity.this.showDialog(MY_DIALOG_ID); 
    } 
}); 

Oh和NO，NO，NO，NO，NO，NO，NO，NO：

case 1: