java - 显示指定文件夹中的视频列表

Question

我已尝试使用以下代码显示指定文件夹中 Activity 中的视频缩略图。问题是当我调试应用程序时，它会显示所有视频路径，但不会显示这些。请在我做错的地方提出任何建议？

代码

private void init_phone_video_grid() {
    System.gc();
    String[] proj = { MediaStore.Video.Media._ID,MediaStore.Video.Media.DATA,MediaStore.Video.Media.DISPLAY_NAME,MediaStore.Video.Media.SIZE };
    File file = new File(Environment.getExternalStorageDirectory() + File.separator + "Funtube/UserData/Videos/" + File.separator);
    File[] list = file.listFiles();
        for (File f: list) {
         String name = f.getName();
            if (name.endsWith(".mp4"))
                count++;
            path = file.getAbsolutePath() + "/" + name;
        }

     videocursor = managedQuery(Uri.parse(path), proj, null, null, null);

     //videocursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,proj, null, null, null);
        count = videocursor.getCount();
        videolist = (ListView) findViewById(R.id.PhoneVideoList);
        videolist.setAdapter(new VideoAdapter(getApplicationContext()));
        videolist.setOnItemClickListener(videogridlistener);
    }

视频适配器

public class VideoAdapter extends BaseAdapter {
        private Context vContext;

        public VideoAdapter(Context c) {
            vContext = c;
        }

        public int getCount() {
            return count;
        }

        public Object getItem(int position) {
            return position;
        }

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

        public View getView(int position, View convertView, ViewGroup parent) {
            System.gc();
            ViewHolder holder;
            String id = null;
            convertView = null;
            if (convertView == null) {
                convertView = LayoutInflater.from(vContext).inflate(
                        R.layout.listitem, parent, false);
                holder = new ViewHolder();
                holder.txtTitle = (TextView) convertView
                        .findViewById(R.id.txtTitle);
                holder.txtSize = (TextView) convertView
                        .findViewById(R.id.txtSize);
                holder.thumbImage = (ImageView) convertView
                        .findViewById(R.id.imgIcon);

                video_column_index = videocursor
                        .getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME);
                videocursor.moveToPosition(position);
                id = videocursor.getString(video_column_index);
                video_column_index = videocursor
                        .getColumnIndexOrThrow(MediaStore.Video.Media.SIZE);
                videocursor.moveToPosition(position);
                // id += " Size(KB):" +
                // videocursor.getString(video_column_index);
                holder.txtTitle.setText(id);
                holder.txtSize.setText(" Size(KB):"
                        + videocursor.getString(video_column_index));

                String[] proj = { MediaStore.Video.Media._ID,
                        MediaStore.Video.Media.DISPLAY_NAME,
                        MediaStore.Video.Media.DATA };
                @SuppressWarnings("deprecation")
                Cursor cursor = managedQuery(
                        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));

                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);
                holder.thumbImage.setImageBitmap(curThumb);
                curThumb = null;

            } /*
             * else holder = (ViewHolder) convertView.getTag();
             */
            return convertView;
        }
    }

Answer 1

Display video list from specified folder

使用 MediaStore.Images.Media.DATA 和 like 从哪个目录中获取所有 mp4 文件:

videocursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
              proj,
              MediaStore.Images.Media.DATA + " LIKE ? ",
              new String[] {"%"+file.getAbsolutePath().toString()+"%"}, null);