在Handler中创建警报对话框

Question

我想从一个处理程序创建一个警告对话框,当一个线程终止时,它会发出信号,这是我的代码导致:

android.view.WindowManager $ BadTokenException:无法添加窗口 - 令牌null不适用于应用程序

Handler handler = new Handler() {
      @Override
      public void handleMessage(Message msg) {

        if (dialog != null)
        {
            dialog.dismiss();
            dialog = null;
        }

        switch (serverResponseCode)
        {
        case 200:
        {
            AlertDialog alertDialog;
            alertDialog = new AlertDialog.Builder(getApplicationContext()).create();
            alertDialog.setTitle("Super :)");
            alertDialog.setMessage("Poza a fost trimisa cu success.");
            alertDialog.setButton("Ok", new DialogInterface.OnClickListener() {

                  public void onClick(DialogInterface dialog, int id) {

                     finish();

                } }); 
            alertDialog.show();
            serverResponseCode = -1;

            break;
        }
        default:
        {
            AlertDialog alertDialog;
            alertDialog = new AlertDialog.Builder(getApplicationContext()).create();
            alertDialog.setTitle("Eroare :(");
            alertDialog.setMessage("Eroare la trimiterea pozei.");
            alertDialog.setButton("Ok", new DialogInterface.OnClickListener() {

                  public void onClick(DialogInterface dialog, int id) {

                     finish();

                } }); 
            alertDialog.show();

            break;
        }
        }


         }
     };

Answer 1

问题可能是getApplicationContext()不是你的活动上下文.

    alertDialog = new AlertDialog.Builder(getApplicationContext()).create();
    //should be change to
    alertDialog = new AlertDialog.Builder( YourActivity.this ).create();