android - MediaStore 无法在 Kotlin 中列出手机内的所有视频。为什么？

Question

我创建了一个获取视频的函数

private val projectionVideo = arrayOf(
MediaStore.Video.Media._ID, //ID
MediaStore.Video.Media.DISPLAY_NAME, //NAME
MediaStore.Video.Media.DATA, //PATH TO CONTENT
MediaStore.Video.Media.DATE_TAKEN, //DATE
MediaStore.Video.Media.DURATION,
MediaStore.Video.Media.SIZE
)

private fun queryVideos(cr: ContentResolver): Cursor? =
        cr.query(
            MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
            projectionVideo, null, null,
            MediaStore.Video.Media.DATE_TAKEN + " $SORT_ORDER"
        )

在 Java 中

public static Uri getContentUri(String volumeName) {
                return Uri.parse(CONTENT_AUTHORITY_SLASH + volumeName +
                        "/video/media");
            }
            /**
             * The content:// style URI for the internal storage.
             */
            public static final Uri INTERNAL_CONTENT_URI =
                    getContentUri("internal");
            /**
             * The content:// style URI for the "primary" external storage
             * volume.
             */
            public static final Uri EXTERNAL_CONTENT_URI =
                    getContentUri("external");

问题是这个没有在任何路径中显示任何视频，例如“DCIM”、“WhatsApp 视频”等。我使用自己的应用程序创建的每个视频都将被正确插入，这与默认相机应用程序创建的视频不同，除非我先打开它们。

Answer 1

您可以阅读 Android Shared Storage 中的所有视频使用此代码

    private val videoProjection = arrayOf(
               MediaStore.Video.Media._ID,
               MediaStore.Video.Media.DATA,
               MediaStore.Video.Media.DURATION,
               MediaStore.Video.Media.MIME_TYPE,
               MediaStore.Video.Media.SIZE,
               MediaStore.Video.Media.DATE_ADDED)


    context.contentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
            videoProjection,
            null,
            null,
            "${MediaStore.Video.Media.DATE_ADDED} DESC"
    )?.use { cursor ->
        while (cursor.moveToNext()) {
           //read video attr from cursor
           cursor.getLong(cursor.getColumnIndexOrThrow(videoProjection[0])) // read video id 
           cursor.getString(cursor.getColumnIndexOrThrow(videoProjection[1])) // read video path 
           // and .....
        }
    }