make alert dialog with 3 buttons
alertDialog = new AlertDialog.Builder(this).create();
    alertDialog.setTitle("Dialog Button");
    alertDialog.setMessage("This is a three-button dialog!");
    alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Button 1 Text", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
        //...
    } }); 
    alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Button 2 Text", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
        //...
    }}); 
    alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "Button 3 Text", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
        //...
    }});
