Question

我想播放frontView上的视频，如何在listView中检测视图，在getView时播放，在向上滚动时暂停。怎么做？

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;
        }

    }    

}

当我将视频向上或向下滚动时，我想在listview中隐藏视频时停止播放。

Answer 1

创建RecyclerListener并在ListView上设置：

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

当视图在屏幕外滚动并变为＆＃34;隐藏＆＃34;时，ListView将回收它，并且您将调用onMovedToScrapHeap（）。

Answer 2

我从上面的代码开始，然后进行了一些更改：

public class MainActivity extends Activity {
    ListView listview;
    CustomListAdapter adapter;
    public int mCurrentItem;
    public static ArrayList<String> sVideoList;
    static
    {
        sVideoList = new ArrayList<String>();
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
        sVideoList.add("http://journey.coderspreview.com/uploads/Home_Video/mov_bbb.mp4");
    }

    public static MediaController mediaController ;
    boolean pauseOnScroll = true;
    boolean pauseOnFling = true;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listview = (ListView) findViewById(R.id.list);
        adapter = new CustomListAdapter(MainActivity.this, sVideoList);
        // Set video link (mp4 format )
        listview.setAdapter(adapter);
        listview.setRecyclerListener(new AbsListView.RecyclerListener() {
            @Override
            public void onMovedToScrapHeap(View view) {
                // Safety net
                VideoView videoView = (VideoView)view.findViewById(R.id.VideoView);
                videoView.stopPlayback();
            }
        });
        listview.setOnScrollListener(new AbsListView.OnScrollListener() {
            private int mFirstVisibleRow = -1;
            private int mActiveItem = -1;

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem,
                                 int visibleItemCount, int totalItemCount) {
                int firstVisibleRow = listview.getFirstVisiblePosition();
                if( mFirstVisibleRow != firstVisibleRow )
                {
                    mFirstVisibleRow = firstVisibleRow;

                    // Cancel the video of the previous active item
                    VideoView prevActiveVideoView = getVideoViewForRow(mActiveItem);
                    if( prevActiveVideoView != null )
                    {
                        prevActiveVideoView.pause();
                    }

                    // Start the video of the new active item
                    mActiveItem = mFirstVisibleRow + 1;
                    VideoView newActiveVideoView = getVideoViewForRow(mActiveItem);
                    if(newActiveVideoView != null)
                    {
                        newActiveVideoView.start();
                    }
                }
            }

            private VideoView getVideoViewForRow(int row)
            {
                int firstVisibleRow = listview.getFirstVisiblePosition();
                View rowView = listview.getChildAt(row-firstVisibleRow);
                return (rowView == null) ? null : (VideoView)rowView.findViewById(R.id.VideoView);
            }

        });

    }

    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.video_list_item, null);

            VideoView videoView = (VideoView)convertView.findViewById(R.id.VideoView);
            TextView videoTextView = (TextView)convertView.findViewById(R.id.txvposition);

            // We setup the video here but we don't start it until the view is scrolled to
            videoTextView.setText("Video " + position);
            Uri uri = Uri.parse(videoList.get(position));
            videoView.setVideoURI(uri);
            return convertView;
        }

    }

}

和video_list_item.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <VideoView
        android:id="@+id/VideoView"
        android:layout_width="match_parent"
        android:layout_height="300dp" />

    <TextView
        android:id="@+id/txvposition"
        android:layout_width="match_parent"
        android:layout_height="80dp" />

</LinearLayout>

您不必在创建视图时启动视频，而是等待它开始运行直到它变为活动状态。一次只允许一个VideoView变为活动状态，当它停止活动时，它会暂停。目前它的编码使得屏幕上的第二个可见VideoView处于活动状态。

这不是完美的代码。即，现在它已实现，列表视图中的第一个VideoView将永远不会播放其视频。但是，它确实解决了上述问题，并将帮助您进一步迭代。

Answer 3

这有两个问题。

管理视频播放。（使用textureView）
滚动列表中的哪个视图当前处于活动状态。

尝试this link和this one

滚动列表视图时如何逐个播放视频和播放/暂停

3 个答案: