无法将声音文件添加到 Mediastore铃声管理器

如何解决无法将声音文件添加到 Mediastore铃声管理器

我想将自定义声音文件添加到我设备的铃声库 (MediaStore)，这样如果用户希望更改由我的应用程序创建的通知声音，他应该简单地转到通知设置并选择我的应用程序特定铃声（myApp_Ring_1 、myApp_Ring_2 等）来自铃声管理器。目前我的声音文件正在被复制到 Music 文件夹，而不是被添加到 Mediastore（铃声管理器）。请帮忙。下面是我的代码。

        public void AddAlertSound(Context c )
        {
            InsertCustomSoundInMediaStore("AlertSound/myApp_Ring_1.mp3","myApp_Ring_1",c);
        }

        public Android.Net.Uri InsertCustomSoundInMediaStore(string filePath,string name,Context c)
        {
            ContentValues values = new ContentValues();
            ContentResolver contentResolver = c.ContentResolver;

            var appName = "myApp";

            values.Put(MediaStore.MediaColumns.DisplayName,name + ".mp3");
            values.Put(MediaStore.MediaColumns.Title,name);
            values.Put(MediaStore.MediaColumns.MimeType,"audio/mp3");
            values.Put(MediaStore.MediaColumns.Size,GetDuration(filePath));
            values.Put(MediaStore.Audio.Media.InterfaceConsts.Artist,appName);
            values.Put(MediaStore.Audio.Media.InterfaceConsts.IsRingtone,true);
            values.Put(MediaStore.Audio.Media.InterfaceConsts.IsNotification,true);
            values.Put(MediaStore.Audio.Media.InterfaceConsts.IsAlarm,true);
            values.Put(MediaStore.Audio.Media.InterfaceConsts.IsMusic,false);

            Android.Net.Uri newUri = contentResolver.Insert(MediaStore.Audio.Media.ExternalContentUri,values);

            try
            {
                AssetManager assets = c.Assets;
                AssetFileDescriptor descriptor = Android.App.Application.Context.Assets.OpenFd(filePath);

                using (System.IO.Stream inputStream = descriptor.CreateInputStream())
                {
                    using (System.IO.Stream outputStream = contentResolver.OpenOutputStream(newUri))
                    {
                        byte[] buffer = new byte[inputStream.Length];
                        int bytesRead;
                        while ((bytesRead = inputStream.Read(buffer,buffer.Length)) > 0)
                        {
                            outputStream.Write(buffer,bytesRead);
                            outputStream.Flush();
                        }
                    }
                }
            }

            catch (Exception ex)
            {
                Toast.MakeText(c,ex + "",ToastLength.Long).Show();
                System.Console.WriteLine(ex.Message);
            }

            return newUri;
        }

        public double GetDuration(string fileName)
        {
            MediaPlayer mediaPlayer = new MediaPlayer();
            AssetFileDescriptor descriptor = Android.App.Application.Context.Assets.OpenFd(fileName);
            mediaPlayer.SetDataSource(descriptor.FileDescriptor,descriptor.StartOffset,descriptor.Length);
            mediaPlayer.Prepare();
            return mediaPlayer.Duration;
        }