用MediaPlayer在Xamarin的主要活动中播放音频不起作用

using Android.App;
using Android.Media;
using Android.OS;
using Android.Support.V7.App;

namespace YourNamespace
{
    [Activity(Label = "YourActivity")]
    public class YourActivity : AppCompatActivity
    {
        private MediaPlayer mediaPlayer;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.YourLayout);

            // 初始化MediaPlayer
            mediaPlayer = new MediaPlayer();

            // 设置音频文件路径
            string audioFilePath = "path_to_your_audio_file";
            mediaPlayer.SetDataSource(audioFilePath);

            // 准备MediaPlayer
            mediaPlayer.Prepare();

            // 播放音频
            mediaPlayer.Start();
        }

        protected override void OnDestroy()
        {
            base.OnDestroy();

            // 释放MediaPlayer资源
            mediaPlayer.Release();
            mediaPlayer = null;
        }
    }
}