Android detect dialog closed

萬解
不管是因為按back鍵或按到dialog外面區域或按dialog內元件產生的dialog關閉，通通會跑來這裡

dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
public void onDismiss(DialogInterface dialog) {
//do something you wanna here
    dialog.dismiss();
}
});