向下滚动后，ListView 不显示实际的视频文件

Question

在我的应用程序中，我在 ListView 中显示 SD 卡视频。 ListView 显示视频缩略图、标题、大小、持续时间。当我向下滚动时，它会显示相同的视频和缩略图，但如果我单击一个项目，它会向另一个 activity 显示不同的视频文件。我只希望在 ListView 中实际视频会显示我是向下滚动还是向上滚动。

这是我的代码。

public class LoadVideo 扩展 AppCompatActivity {

private Cursor videoCursor;
private int video_column_index;
ListView videoList;
int count;
String[] thumbColumns = {MediaStore.Video.Thumbnails.DATA,
        MediaStore.Video.Thumbnails.VIDEO_ID};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.load_video_activity);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    init_phone_video_grid();
}

private void init_phone_video_grid()
{
    String[] proj = {MediaStore.Video.Media._ID,
            MediaStore.Video.Media.DATA,
            MediaStore.Video.Media.DISPLAY_NAME,
            MediaStore.Video.Media.SIZE,
            MediaStore.Video.Media.DURATION};

    videoCursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, proj, null, null, null);
    count = videoCursor.getCount();

    videoList = (ListView) findViewById(R.id.videoList);
    videoList.setAdapter(new VideoAdapter(this.getApplicationContext()));
    videoList.setOnItemClickListener(videoGridListener);
}

private AdapterView.OnItemClickListener videoGridListener = new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

        video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
        videoCursor.moveToPosition(i);
        String fileName = videoCursor.getString(video_column_index);
        Intent intent = new Intent(LoadVideo.this, ShowVideo.class);
        intent.putExtra("videofilename", fileName);
        startActivity(intent);
    }
};

public class VideoAdapter extends BaseAdapter
{
    Context context;

    VideoAdapter(Context context)
    {
        this.context = context;
    }

    @Override
    public int getCount() {
        return count;
    }

    @Override
    public Object getItem(int i) {
        return i;
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup)
    {
        ViewHolder viewHolder;
        String id;

        if (view == null)
        {
            viewHolder = new ViewHolder();
            view = LayoutInflater.from(context).inflate(R.layout.list_items, viewGroup, false);

            viewHolder.titleName = (TextView) view.findViewById(R.id.title);
            viewHolder.duration = (TextView) view.findViewById(R.id.duration);
            viewHolder.size = (TextView) view.findViewById(R.id.size);
            viewHolder.thumbImage = (ImageView) view.findViewById(R.id.imageIcon);

            //Title
            video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME);
            videoCursor.moveToPosition(i);
            id = videoCursor.getString(video_column_index);
            viewHolder.titleName.setText(id);

            //Size
            video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE);
            videoCursor.moveToPosition(i);

            String vSize;
            long videoSize = videoCursor.getLong(video_column_index);
            double actualSizeInMB = videoSize/(1024.0 * 1024.0);
            DecimalFormat dec = new DecimalFormat("0.00");

            if (actualSizeInMB > 1)
            {
                vSize = dec.format(actualSizeInMB).concat(" MB");
                viewHolder.size.setText(vSize);
            }
            else
            {
                vSize = dec.format(actualSizeInMB).concat(" KB");
                viewHolder.size.setText(vSize);
            }

            //Duration
            video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION);
            videoCursor.moveToPosition(i);
            long  time = videoCursor.getLong(video_column_index);
            long seconds = time/1000;
            long minutes = seconds/60;
            seconds = seconds % 60;
            String setTime ;
            if (seconds < 10)
            {
                setTime = String.valueOf(minutes) + ":0" + String.valueOf(seconds);
                viewHolder.duration.setText(setTime.concat( " | "));
            }
            else
            {
                setTime = String.valueOf(minutes) + ":" + String.valueOf(seconds);
                viewHolder.duration.setText(setTime.concat( " | "));
            }

            //String[] proj = { MediaStore.Video.Media._ID, MediaStore.Video.Media.DISPLAY_NAME, MediaStore.Video.Media.DATA };
            //Cursor cursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, proj,
                    //MediaStore.Video.Media.DISPLAY_NAME + "=?", new String[] { id }, null);
            //cursor.moveToFirst();
            //long ids = cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media._ID));

            long ids = videoCursor.getInt(videoCursor.getColumnIndex(MediaStore.Video.Media._ID));
            ContentResolver crThumb = getContentResolver();
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = 1;
            Bitmap curThumb = MediaStore.Video.Thumbnails.getThumbnail(crThumb, ids, MediaStore.Video.Thumbnails.MICRO_KIND, options);
            viewHolder.thumbImage.setImageBitmap(curThumb);
            curThumb = null;

            //video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
            //videoCursor.moveToPosition(i);
            //String path = videoCursor.getString(video_column_index);
            //Bitmap thumbnail = ThumbnailUtils.createVideoThumbnail(path, MediaStore.Video.Thumbnails.MICRO_KIND);
            //viewHolder.thumbImage.setImageBitmap(thumbnail);

            //videoThumbnailCursor.close();

        }

        return view;
    }

    private class ViewHolder
    {
        TextView titleName;
        TextView size;
        TextView duration;
        ImageView thumbImage;
    }
}

}

Answer 1

从这一点开始：if(view == null)，修改您的代码：

if (view == null) {
        viewHolder = new ViewHolder();
        view = LayoutInflater.from(context).inflate(R.layout.list_items, viewGroup, false);
        viewHolder.titleName = (TextView) view.findViewById(R.id.title);
        viewHolder.duration = (TextView) view.findViewById(R.id.duration);
        viewHolder.size = (TextView) view.findViewById(R.id.size);
        viewHolder.thumbImage = (ImageView) view.findViewById(R.id.imageIcon);
        view.setTag(viewHolder);

 } else {

        viewHolder = (ViewHolder)(view.getTag());
 }
//Title.....and so on...

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