Java Seekbar在4秒视频播放后消失。触摸屏幕时不显示。它'；s仅显示开始4秒和完成时间

这是我的密码

Seekbar在视频播放4秒后消失。它不会再次出现。请触摸视频。它只有在视频完成后才可见。但我需要在触摸播放视频时再次显示seekbar。请帮助某人解决这个问题

   String videoURL="https://media.geeksforgeeks.org/wp-content/uploads/20201217163353/Screenrecorder-2020-12-17-16-32-03-350.mp4";
                //bandwisthmeter is used for getting default bandwidth
                BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
                // track selector is used to navigate between video using a default seekbar.
                TrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory(bandwidthMeter));
                //we are ading our track selector to exoplayer.
                player= ExoPlayerFactory.newSimpleInstance(_activity,trackSelector);
                // we are parsing a video url and parsing its video uri.
                Uri videouri= Uri.parse(videoURL);
                // we are creating a variable for datasource factory and setting its user agent as 'exoplayer_view'
                DefaultHttpDataSourceFactory dataSourceFactory=new DefaultHttpDataSourceFactory("exoplayer_video");
                // we are creating a variable for extractor factory and setting it to default extractor factory.
                ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
                //we are creating a media source with above variables and passing our event handler as null,
                MediaSource mediaSource = new ExtractorMediaSource(videouri,dataSourceFactory,extractorsFactory,null,null);
                //inside our exoplayer view we are setting our player
                previewPlayerView.setPlayer(player);
                //we are preparing our exoplayer with media source.
                player.prepare(mediaSource);
                //we are setting our exoplayer when it is ready.
                player.setPlayWhenReady(true);

这是我的XML

    <com.google.android.exoplayer2.ui.SimpleExoPlayerView
        android:id="@+id/previewVideo"
        android:layout_width="match_parent"
        android:layout_height="500dp"
        />