添加黑条不拉伸视频

Question

我在rtsp上有一段视频，我想让视频视图适合我的所有视图宽度。这是一个问题：视频的分辨率非常低且平方，所以视频视图会拉伸我的视频。这是我的代码：

<VideoView
        android:id="@+id/videoView"
        android:layout_width="wrap_content"
        android:layout_height="300dp"
        android:layout_below="@+id/idHeader"
        android:layout_alignParentStart="false"
        android:layout_alignParentEnd="false"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:layout_gravity="center"
        android:layout_centerInParent="true"/>

在片段内

 //find the video view and assign the media controller and the button.
     videoView = (VideoView) view.findViewById(R.id.videoView);
     mediaC = new MediaController(getContext());
     playButton = (ImageView) view.findViewById(R.id.playButton);
     playButton.setImageResource(R.drawable.ic_play_arrow_24dp);
     playButton.setClickable(false);
     //declare progress bar for the video buffering.
     mProgressBar = (ProgressBar) view.findViewById(R.id.videoProgressBar);
     mProgressBar.setVisibility(View.INVISIBLE);

     //set the background and video controller for the video.
     videoView.setBackgroundColor(Color.BLACK);
     videoView.setMediaController(mediaC);
     mediaC.setAnchorView(videoView);
     mediaC.setVisibility(View.INVISIBLE);

     //declare the MediaPlayer listener for the video buffering and starts the handler for stop video
     //after 15 seconds.
     final MediaPlayer.OnInfoListener onInfoToPlayStateListener = new MediaPlayer.OnInfoListener() {
         @Override
         public boolean onInfo(MediaPlayer mp, int what, int extra) {
             switch (what) {
                 case MediaPlayer.MEDIA_INFO_BUFFERING_END: {
                     mProgressBar.setVisibility(View.INVISIBLE);
                     videoView.setBackgroundColor(Color.TRANSPARENT);
                     int delay = 15000; //milliseconds
                     Handler handler = new Handler();
                     handler.postDelayed(new Runnable(){
                         public void run(){
                             videoView.stopPlayback();
                             videoView.clearAnimation();
                             videoView.suspend(); // clears media player
                             videoView.setVideoURI(null);
                             videoView.setVisibility(View.VISIBLE);
                             videoView.setBackgroundColor(Color.BLACK);
                             videoView = null;
                             playButton.setImageResource(R.drawable.ic_play_arrow_24dp);
                             playButton.setVisibility(View.VISIBLE);
                         }
                     }, delay);

                     return true;
                 }
             }
             return false;
         }
     };
    videoView.setOnInfoListener(onInfoToPlayStateListener);

    //declare the playButton click listener for play and stop video.
    playButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(videoView == null){
                videoView = (VideoView) view.findViewById(R.id.videoView);
                videoView.setMediaController(mediaC);
                mediaC.setAnchorView(videoView);
                mediaC.setVisibility(View.INVISIBLE);
            }
            if(videoView.isPlaying()){
                playButton.setImageResource(R.drawable.ic_play_arrow_24dp);
                playButton.setVisibility(View.VISIBLE);
                videoView.stopPlayback();
                videoView = null;
            }
            else{
                mProgressBar.setVisibility(View.VISIBLE);
                playButton.setImageResource(R.drawable.ic_pause_black_24dp);
                playButton.setVisibility(View.INVISIBLE);
                videoView.setVideoURI(source, headers);
                videoView.start();
            }
        }
    });

我想添加相同的黑带以保持视频比例。 Thare是一种我可以添加的方法，而不是视频视图吗？

谢谢