Android Dilaog 设立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();