My problem was that when a user clicks the Sign Up for example button I wanted to validate a field if it contains a valid email and after that dismiss or keep the dialog showing.
To achieve that I just copied the code from here which overrides the click of the buttons:
final AlertDialog d = new AlertDialog.Builder(context) .setView(v) .setTitle(R.string.my_title) .setPositiveButton(android.R.string.ok, null) //Set to null. We override the onclick .setNegativeButton(android.R.string.cancel, null) .create(); d.setOnShowListener(new DialogInterface.OnShowListener() { @Override public void onShow(DialogInterface dialog) { Button b = d.getButton(AlertDialog.BUTTON_POSITIVE); b.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // TODO Do something //Dismiss once everything is OK. d.dismiss(); } }); }