align AlertDialog buttons to center

Question

I use this codes for Android (Java) programming:

public static MessageBoxResult showOk(         Context context, String title, String message, String okMessage) {     okDialogResult = MessageBoxResult.Closed;      // make a handler that throws a runtime exception when a message is received     final Handler handler = new Handler()     {         @Override         public void handleMessage(Message mesg)         {             throw new RuntimeException();         }     };      AlertDialog.Builder alert = new AlertDialog.Builder(context);     alert.setTitle(title);     alert.setMessage(message);      alert.setPositiveButton(okMessage, new DialogInterface.OnClickListener() {          public void onClick(DialogInterface dialog, int whichButton) {             okDialogResult = MessageBoxResult.Positive;             handler.sendMessage(handler.obtainMessage());         }     });      AlertDialog dialog = alert.show();       // align button to center     Button b = (Button) dialog.findViewById(android.R.id.button1);     b.setGravity(Gravity.CENTER_HORIZONTAL);      // loop till a runtime exception is triggered.     try { Looper.loop(); }     catch(RuntimeException e2) {}      return okDialogResult; } 

My problem is how make center the button? As you see I try to align button to cnenter using Gravity.CENTER_HORIZONTAL (also .CENTER) but nothing changes. The button is almost in right position.

Answer 1

Use crtn's method, but instead of changing the LayoutParam's gravity, change its width to ViewGroup.LayoutParams.MATCH_PARENT;