如何在我的/ sdcard/Android/data/mypackage/files文件夹中获取视频缩略图？

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

String[] projection = { MediaStore.Video.Media._ID, MediaStore.Video.Media.DATA };
String selection = null;
String[] selectionArgs = null;
String sortOrder = null;
Cursor cursor = getContentResolver().query(
    MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
    projection,
    selection,
    selectionArgs,
    sortOrder
);

if (cursor != null && cursor.moveToFirst()) {
    do {
        long id = cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media._ID));
        String path = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DATA));
        // 在这里可以对视频文件进行处理，比如生成缩略图
    } while (cursor.moveToNext());
}

Bitmap thumbnail = ThumbnailUtils.createVideoThumbnail(path, MediaStore.Images.Thumbnails.MINI_KIND);
File file = new File(getExternalFilesDir(null), "thumbnail.jpg");
try (OutputStream outputStream = new FileOutputStream(file)) {
    thumbnail.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
} catch (IOException e) {
    e.printStackTrace();
}