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/**
 * get all video path on device
 * permission: READ_EXTERNAL_STORAGE
 * @param context 
 * @return list file media
 */
public static List<File> getAllMediaFilesOnDevice(Context context) {
        List<File> files = new ArrayList<>();
        try {

            final String[] columns = { MediaStore.Images.Media.DATA,
                    MediaStore.Images.Media.DATE_ADDED,
                    MediaStore.Images.Media.BUCKET_ID,
                    MediaStore.Images.Media.BUCKET_DISPLAY_NAME };

            MergeCursor cursor = new MergeCursor(new Cursor[]{context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, null),
                    context.getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, columns, null, null, null),
                    context.getContentResolver().query(MediaStore.Images.Media.INTERNAL_CONTENT_URI, columns, null, null, null),
                    context.getContentResolver().query(MediaStore.Video.Media.INTERNAL_CONTENT_URI, columns, null, null, null)
            });
            cursor.moveToFirst();
            files.clear();
            while (!cursor.isAfterLast()){
                String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
                int lastPoint = path.lastIndexOf(".");
                path = path.substring(0, lastPoint) + path.substring(lastPoint).toLowerCase();
                files.add(new File(path));
                cursor.moveToNext();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return files;
    }