Android Dilaog 设置没有标题注意的地方

layoutInflater = LayoutInflater.from(mContext);    final Dialog dialog = new Dialog(mContext);        View popView = layoutInflater.inflate(R.layout.popupwindow, null);    //设置Dialog没有标题，这个一定要在设置内容之前定义    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);    dialog.setContentView(popView);    //设置Dialog没有标题，在之后定义就会报错    //dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);    dialog.setCancelable(true);    viewFilpper = (ViewFlipper) popView.findViewById(R.id.viewFlipper);    viewFilpper.setInAnimation(AnimationUtils.loadAnimation(mContext, R.anim.menu_in));        viewFilpper.setOutAnimation(AnimationUtils.loadAnimation(mContext, R.anim.menu_out));    viewFilpper.setFlipInterval(60000);    ImageView imagView = (ImageView) popView.findViewById(R.id.caihead);    imagView.setImageBitmap(list.get(m-1));        Button button =(Button) popView.findViewById(R.id.speed);    Button detail =(Button) popView.findViewById(R.id.deleat);    dialog.show();