如何在Android Q媒体商店中更新音频文件的元数据? [英] How to update metadata of audio file in Android Q media store?

问题描述

在Android Q OS中无法更新媒体存储中音频文件的元数据，在所有其他OS中都可以使用

Updating metadata of audio file in media store is not working in Android Q OS, it works in all other OS.

我正在使用内容提供商，并将uri指定为MediaStore.Audio.Media.EXTERNAL_CONTENT_URI.在所有Android Q设备以下都可以正常工作.下面是我用来更新跟踪元数据的代码.

I am using content provider with uri specified as MediaStore.Audio.Media.EXTERNAL_CONTENT_URI. It is working fine in all below Android Q device. Below is the code that I am using to update track metadata.

ContentValues cv = new ContentValues();
ContentResolver resolver = getContentResolver();
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

cv.put(MediaStore.Audio.Media.TITLE, newTitle);
cv.put(MediaStore.Audio.Media.ALBUM, newAlbumName);
cv.put(MediaStore.Audio.Media.ARTIST, newArtistName);

int rowsUpdated = resolver.update(uri, cv, 
MediaStore.Audio.Media._ID + " = ? ", new String[]{audioId});

对于Android Q设备，rowsUpdated始终为0，无一例外. 其他音乐播放器如何更新Android Q中的曲目元数据?

For Android Q device, rowsUpdated is always 0 with no exception. How are other music player updating tracks metadata in Android Q ?

推荐答案

最后，花了一些时间，但我发现了.

Finally, it took some time but I figured that out.

首先，您需要访问文件. 在这里您可以阅读有关

First, you need to obtain access to file. Here you can read about that

接下来，我发现要更新标题或艺术家字段(也许其他人没有对它们进行测试)，则需要将列MediaStore.Audio.Media.IS_PENDING的值设置为1.这样:

Next, I found out that to update title or artist fields (maybe others to, I didn't test them) you need to set column MediaStore.Audio.Media.IS_PENDING value to 1. Like that:

    val id = //Your audio file id

    val values = ContentValues()
    values.put(MediaStore.Audio.Media.IS_PENDING, 1)

    val uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id)
    contentResolver.update(uri, values, null, null)

然后您可以编辑所需的字段.另外，要结束更新过程，请将MediaStore.Audio.Media.IS_PENDING再次设置为0:

And then you can edit fields that you need. Also to end the update process set MediaStore.Audio.Media.IS_PENDING to 0 again:

    val id = //Your audio file id
    val title = //New title
    val artist = //New artist

    val values = ContentValues()
    values.put(MediaStore.Audio.Media.IS_PENDING, 0)
    values.put(MediaStore.Audio.Media.TITLE, title)
    values.put(MediaStore.Audio.Media.ARTIST, artist)

    val uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id)
    contentResolver.update(uri, values, null, null)

所以在一个函数中，它看起来像这样:

So in one function, it would look like this:

    @RequiresApi(value = android.os.Build.VERSION_CODES.Q)
    fun updateMetadata(contentResolver: ContentResolver, id: Long, title: String, artist: String) {
        val uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id)
        val values = ContentValues()

        values.put(MediaStore.Audio.Media.IS_PENDING, 1)
        contentResolver.update(uri, values, null, null)

        values.clear()
        values.put(MediaStore.Audio.Media.IS_PENDING, 0)
        values.put(MediaStore.Audio.Media.TITLE, title)
        values.put(MediaStore.Audio.Media.ARTIST, artist)
        contentResolver.update(uri, values, null, null)
    }

它是用Kotlin写的，但我想您会想出如何用Java做到这一点的.

It's written in Kotlin but I think you will figure out how to do that in java.

UPD

通过更新MediaStore，您不会在任何android版本上更新实际文件.这意味着，如果文件被MediaScannerConnection更新(例如:重命名)和/或扫描，您的更改将丢失. 此答案是正确的.

By updating MediaStore you don't updating real file at any android version. That means, if a file would be updated (for example: renamed) and/or scanned by MediaScannerConnection your changes will be lost. This answer is right.

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