Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
button.setOnClickListener(new View.OnClickListener() {

	@Override
	public void onClick(View view) {
		// TODO Do something

		//Dismiss once everything is OK.
		dialog.dismiss();
	}
});

重写点击事件,可控制对话框是否消失
注:必须在show之后,可在show后面的代码重写,可在setOnShowListener里重写