AlertDialog still visible evenafter dismissed by onClick

Question

Alert Dialog is visible until the startVibrate() method completes its task but I want to dismiss it as soon as clicked on Ok

   AlertDialog.Builder builder = new Builder(VibrationActivity.this);
            builder.setCancelable(false);
            builder.setTitle("Vibration Test");
            builder.setMessage("Your device will vibrate now.");
            builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();   //Dismiss the dialog
                    startVibration();       //Start the test
                }
            });
            builder.show();

    public void startVibration(){
      for (int i = 1; i <= 5; i++) {
         try {
              vibrator.vibrate(500); // Vibration time in milliseconds
              Thread.sleep(750); // Interval between two vibration
         } catch (InterruptedException e) {
           e.printStackTrace();
        }
    }
    }

Answer 1

You should just launch your AlertDialog within your Activity. your Thread should dispatch a message via a handler to the Activity to know when to show and dismiss your Dialog.

Answer 2

首先调用startVibrate方法，然后关闭对话框，最好调用cancel而不是dismiss。