我试图在对话框中显示视频，但找不到VideoView，尽管id是正确的。我在这一行得到一个NullPointerException：

VideoView vv = (VideoView) findViewById(R.id.videoview1);

这是我的代码：

Dialog dialog2 = new Dialog(getContext(),
                    android.R.style.Theme_Translucent_NoTitleBar_Fullscreen);
            dialog2.setContentView(R.layout.video);

            VideoView vv = (VideoView) findViewById(R.id.videoview1);
            String uri = "android.resource://" + theGameActivity.getPackageName() +"/"+R.raw.video6;
dialog2.show();
            vv.start();