无法以编程方式从外部存储中删除文件

public static boolean delete(final Context context, final File file) {    final String where = MediaStore.MediaColumns.DATA + "=?";    final String[] selectionArgs = new String[] { file.getAbsolutePath()    };    final ContentResolver contentResolver = context.getContentResolver();    final Uri filesUri = MediaStore.Files.getContentUri("external");    contentResolver.delete(filesUri, where, selectionArgs);    if (file.exists()) {        contentResolver.delete(filesUri, where, selectionArgs);    }    return !file.exists();}