Android 加载本地视频封面

1、使用Glide可以加载视频封面，是不是首帧就不知道了

Glide  
.with(context)
.load(Uri.fromFile(new File(filePath)))
.into(mImage);

2、也可以通过MediaMetadataRetriever获取Bitmap，这个就占内存多一些

MediaMetadataRetriever media = new MediaMetadataRetriever();
media.setDataSource(videoPath);
Bitmap bitmap = media.getFrameAtTime();

3、也可以在媒体库查询中通过BitmapFactory.decodeFile('媒体库的content路径');生成bitmap

 Cursor cursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, MediaStore.Video.Media.ALBUM + "=?", new String[]{Constants.DIRECTORY_VIDEO}, MediaStore.Video.Media.DEFAULT_SORT_ORDER);
    try {
        for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
            int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));
            //视频缩略图路径
            String albumPath = "";
            Cursor thumbCursor = context.getApplicationContext().getContentResolver().query(
                    MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI,
                    null, MediaStore.Video.Thumbnails.VIDEO_ID
                            + "=" + id, null, null);
            if (thumbCursor.moveToFirst()) {
                albumPath = thumbCursor.getString(thumbCursor
                        .getColumnIndex(MediaStore.Video.Thumbnails.DATA));
                Bitmap bitmap = BitmapFactory.decodeFile(albumPath);
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (cursor != null)
            cursor.close();
    }

4、同Glide一样，Fresco也可以加载

mImage.setImageURI(Uri.parse("file://" +  filePath));