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当我从 android 7 升级到 8.1 后启动我的应用程序时，我注意到它失去了很多响应能力。

当我尝试从设备内存中获取歌曲时，会出现很多错误，例如：

E/SEC_DRM_PLUGIN_Omafl: OmaPlugin::onOpenDecryptSession(fd)::Drm2IsDrmFileByExtFd::file 不是 DRM 扩展

这比在 Android 7 上运行要慢得多。

代码：

public ArrayList<Song> getSongList() {
    MediaMetadataRetriever metaRetriver = new MediaMetadataRetriever();
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
    ArrayList<Song> songList = new ArrayList<>();
    ContentResolver musicResolver = context.getContentResolver();
    Uri musicUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Cursor musicCursor = musicResolver.query(musicUri, null, selection, null, null);

    if (musicCursor != null && musicCursor.moveToFirst()) {
        int titleColumn = musicCursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
        int idColumn = musicCursor.getColumnIndex(MediaStore.Audio.Media._ID);
        int artistColumn = musicCursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
        int durationColumn = musicCursor.getColumnIndex(MediaStore.Audio.Media.DURATION);
        int column_index = musicCursor.getColumnIndex(MediaStore.Audio.Media.DATA);

        do {
            long id = musicCursor.getLong(idColumn);
            String path = musicCursor.getString(column_index);
            String title = musicCursor.getString(titleColumn);
            String artist = musicCursor.getString(artistColumn);
            String duration = musicCursor.getString(durationColumn);

            try {
                metaRetriver.setDataSource(path);
                songList.add(new Song(id, title, artist, path, duration));
            }catch (Exception exc){}

        } while (musicCursor.moveToNext());
    }
    return songList;
}
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1 回答 1

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在尝试从内存中获取每一首歌曲时，我不得不删除导致错误的一行代码：

mediaMetadataRetriver.setDataSource(pathOfSong);

希望它会帮助你。

于 2018-12-15T10:12:24.090 回答