android - 如何在滚动 ListView 时逐个播放视频和播放/暂停

Question

我想播放 frontView 上的视频，如何检测 listView 中的 View 并在 getView 时播放并在向上滚动时暂停。如何做到这一点？

这是我的代码。

public class MainActivity extends Activity {
    ListView listview;
    CustomListAdapter adapter;
    public static int currentItem;
    public static ArrayList<String> videoLIst;
    public static MediaController mediaController ;
    boolean pauseOnScroll = true;
    boolean pauseOnFling = true;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view);
        videoLIst = new ArrayList<String>();
         mediaController = new MediaController(MainActivity.this); 
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        videoLIst.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        listview = (ListView) findViewById(R.id.list);
        adapter = new CustomListAdapter(MainActivity.this, videoLIst);
        // Set video link (mp4 format )
        listview.setAdapter(adapter);
        listview.setOnScrollListener(new OnScrollListener() {

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem,
                    int visibleItemCount, int totalItemCount) {
                // TODO Auto-generated method stub

                int firstVisibleRow = listview.getFirstVisiblePosition();
                int lastVisibleRow = listview.getLastVisiblePosition();

                for(int i=firstVisibleRow;i<=lastVisibleRow;i++)
                {
                    //Write your code here(allocation/deallocation/store in array etc.)
                    System.out.println(i + "=" + listview.getItemAtPosition(i));
                    currentItem = (int) listview.getItemAtPosition(i);
                }
            }
        });


    }

    public class CustomListAdapter extends BaseAdapter {
        private Activity activity;
        private LayoutInflater inflater;
        private ArrayList<String> videoList;

        public CustomListAdapter(Activity activity, ArrayList<String> videoList) {
            this.activity = activity;
            this.videoList = videoList;
        }

        @Override
        public int getCount() {
            return videoList.size();
        }

        @Override
        public Object getItem(int location) {
            return videoList.get(location);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            if (inflater == null)
                inflater = (LayoutInflater) activity
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            if (convertView == null)
                convertView = inflater.inflate(R.layout.activity_main, null);

            VideoView video = (VideoView)convertView.findViewById(R.id.VideoView);
            TextView  txvvideo =(TextView)convertView.findViewById(R.id.txvposition);

            txvvideo.setText("Video"+position);

            mediaController.setAnchorView(video);
            Log.d("video url inadapter:", ""+videoLIst.toString());
            Uri uri = Uri.parse(videoList.get(currentItem));
            video.setMediaController(mediaController);
            video.setVideoURI(uri);
            video.start();
            int pos;
            pos=video.getCurrentPosition();
//          if(pos == currentItem)
//          {
//              video.pause();
//          }
//          video.setMediaController(mediaController);
//          video.setVideoURI(Uri.parse(videoList.get(position)));
//          video.start();
             return convertView;
        }

    }    

}

当我向上或向下滚动视频时，它在 listview 中不可见时，我想停止视频。

Answer 1

创建一个 RecyclerListener并将其设置在 ListView 上:

    listView.setRecyclerListener(new RecyclerListener() {
        @Override
        public void onMovedToScrapHeap(View view) {
            VideoView videoView = (VideoView)view.findViewById(R.id.VideoView);
            videoView.stopPlayback();
        }
    });

当 View 滚动到屏幕外并变得“不可见”时，ListView 将回收它，您将调用 onMovedToScrapHeap()。