java nomedia,MediaStore - Uri查询所有类型的文件（媒体和非媒体）
它是 "external" 或 "internal" 虽然内部(系统文件)在这里可能没用 .ContentResolver cr = context.getContentResolver();Uri uri = MediaStore.Files.getContentUri("external");// every column, although that is huge waste, you p...
