如何更新媒体库中的体裁？

Question

我正在尝试更新音频文件的流派标签。

CODE

final Uri genreUri = MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI;

String currentGenreName = MediaStore.Audio.Genres.NAME;

ContentValues values2 = new ContentValues();
values2.put(currentGenreName, genre);

String whereGenre = MediaStore.Audio.Genres._ID + "=?";
String[] whereVal2 = {Long.toString(genreID)};
resolver.update(genreUri, values2, whereGenre, whereVal2);

• 流派：edittext的值（新流派名称）。
• genreID：所选音频文件中的genreID。

我没有收到任何错误，但是MediaStore风格表中的风格没有更新。

[其他标签，例如标题，艺术家，专辑和艺术品，已更新，仅流派不起作用。

我也找不到有关更新音频文件中流派名称的任何信息，我只能通过上面的标签来做到这一点。

编辑

我用于编辑标题，艺术家，专辑名称和年份标签的代码，它可以正常工作，所以我认为我必须对类型名称进行相同的操作，因为我具有类型ID。

final Uri musicUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;


ContentResolver resolver = c.getContentResolver();

String currentTitle     = MediaStore.Audio.Media.TITLE;
String currentArtist    = MediaStore.Audio.Media.ARTIST;
String currentAlbumID   = MediaStore.Audio.Media.ALBUM_ID;
String currentAlbum     = MediaStore.Audio.Media.ALBUM;
String currentGenreID   = MediaStore.Audio.Genres._ID;
String currentGenreName = MediaStore.Audio.Genres.NAME;
String currentAlbumData = MediaStore.Audio.Media.DATA;
String currentYear      = MediaStore.Audio.Media.YEAR;

ContentValues values = new ContentValues();
values.put(currentTitle, title);
values.put(currentArtist, artist);
values.put(currentAlbum, album);
values.put(currentYear, year);

//Update song info.
String where = MediaStore.Audio.Media._ID + "=?";
String[] whereVal = {Long.toString(songID)};
resolver.update(musicUri, values, where, whereVal);

为什么不更新？

Answer 1

您必须使用内容解析器输出流方法来覆盖Android Q中的旧元数据，而且它有点冗长... ...>

if (Build.VERSION.SDK_INT >= VERSION_CODES.Q) {
                Log.d(TAG, "Android Q")
                val displayName = getDisplayName(mSong.id)
                val filePath = getFile(mSong.id, displayName)
                alterMetadata(filePath, mSong.artist, mSong.track, mSong.album, mSong.genre, mSong.metadataYear, mSong.metadataWriter)
                updateViaResolver(mSong.id, filePath)
            } else {
                Log.d(TAG, "Less then Android Q")
                updateMetadataPreQ(mSong.id, mSong.album, mSong.artist)
            }
获取原始文件名以创建临时文件

private fun getDisplayName(mId: String?): String? {
    val uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
    val projection = arrayOf(MediaStore.Audio.Media.DISPLAY_NAME)
    val selection = "${MediaStore.Audio.Media._ID} =?"
    val selectionArgs = arrayOf(mId)
    val cursor = mContext.contentResolver.query(uri, projection, selection, selectionArgs, null)

    var displayName: String? = null

    cursor?.use {
        while (cursor.moveToNext()) {
            displayName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME))
        }
        return displayName
    }
    return null
}
获取文件

private fun getFile(mId: String, displayName: String?): String? {
    displayName?.let {
        val file = File(displayName)
        val prefix = file.nameWithoutExtension
        val fileExtension = file.extension
        val outputDir = mContext.cacheDir
        Log.d(TAG, "displayName $displayName prefix $prefix, fileExtension $fileExtension, outputDir $outputDir")

        try {
            val outputFile = File.createTempFile(prefix, ".$fileExtension", outputDir)
            val resolver: ContentResolver = mContext.contentResolver
            val uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, mId.toLong())
            resolver.openInputStream(uri)?.use { stream -> outputFile.copyInputStreamToFile(stream) }
            return outputFile.absolutePath
        } catch (ex: IOException) {
            Log.d(TAG, "Exception ${ex.message}")
        }
    }
    return null
}
然后我使用J Audio Tagger更改ID3标签。

以及我通过解析器方法进行的更新

// From https://developer.android.com/reference/android/content/ContentProvider
// String: Access mode for the file. May be
// "r" for read-only access,
// "w" for write-only access (erasing whatever data is currently in the file),
// "wa" for write-only access to append to any existing data,
// "rw" for read and write access on any existing data, and
// "rwt" for read and write access that truncates any existing file. This value must never be null.
private fun updateViaResolver(mId: String, filePath: String?) {
    filePath?.let {
        val file = File(filePath)
        val uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, mId.toLong())
        mContext.application.contentResolver.openOutputStream(uri, "w")?.use { stream ->
            stream.write(file.readBytes())
        }
    }
}
助手方法

private fun File.copyInputStreamToFile(inputStream: InputStream?) {
    this.outputStream().use { fileOut ->
        inputStream?.copyTo(fileOut)
    }
}
此文章发布于Android Q ...