java - 将 java 翻译成 c#

Question

我正在尝试为我的 Android 版 xamarin 媒体应用程序提供锁屏控制。我还没有很幸运，但一直在尝试遵循 https://www.youtube.com/watch?v=KNsELLrZ3V0 中找到的本教程。 。我已将其中大部分实现到我的项目中，但有一部分我不确定将他们的 java 转换为我的 C# 时如何进行。我将发布下面的代码，但跳到我正在谈论的视频中的部分可能会更容易。

在视频的 6:50 处，他们开始构建 initMediaSession 方法，这就是我陷入困境的地方。特别是在 mSession.SetCallback 部分。我不知道 C# 将如何执行下面的重载方法，而且我也无法让 mSession.SetCallback(new MediaSession.Callback(){} 不出错。

我遇到的主要错误是“无法创建抽象类或接口(interface)“MediaSession.Callback”的实例”

或者，如果您有更好的策略将媒体控件添加到 Android 锁定屏幕上，请告诉我。谢谢。

private void initMediaSession()
        {
            DabPlayer dabPlayer = new DabPlayer(true);

            mSession = new MediaSession(Application.Context, "example player sesion");
            mController = new Android.Media.Session.MediaController(Application.Context, mSession.SessionToken);

            mSession.SetCallback(new MediaSession.Callback() {
                @Override
                public void onPlay() {
                SuperSocket.onPlay();
                buildNotification(generateAction(Android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE));
                }

                @Override
                public void onPause()
                {
                SuperSocket.onPlay();
                buildNotification(generateAction(Android.R.drawable.ic_media_play, "Play", ACTION_PLAY));
                }

                @Override
                public void onSkipToNext()
                {
                SuperSocket.onPlay();
                buildNotification(generateAction(Android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE));
                }

                @Override
                public void onFastForward()
                {
                super.onFastFoward();
                }

                @Override
                public void onRewind()
                {
                super.onRewind();
                }

                @Override
                public void onRewind()
                {
                super.onStop();
                }

                @Override
                public void onStop()
                {
                super.onStop();
                NotificationManager notificationManager = (NotificationManager)getApplicaitonContext().getSystemService(Context.NotificationService);
                notificationManager.Cancel(1);
                Intent intent = new Intent(getApplicationContext(), MediaPlayerService.class);
                stopService(intent);
                }

        });

Answer 1

您不必翻译任何内容，只需实现现有的 MediaSession.Callback 接口(interface)即可。

class MediaSessionCallback : MediaSession.Callback
{
    public Action OnPlayImpl { get; set; }

    public Action<long> OnSkipToQueueItemImpl { get; set; }

    public Action<long> OnSeekToImpl { get; set; }

    public Action<string, Bundle> OnPlayFromMediaIdImpl { get; set; }

    public Action OnPauseImpl { get; set; }

    public Action OnStopImpl{ get; set; }

    public Action OnSkipToNextImpl{ get; set; }

    public Action OnSkipToPreviousImpl{ get; set; }

    public Action<string, Bundle> OnCustomActionImpl { get; set; }

    public Action<string, Bundle> OnPlayFromSearchImpl { get; set; }

    public override void OnPlay ()
    {
        OnPlayImpl ();
    }

    public override void OnSkipToQueueItem (long id)
    {
        OnSkipToQueueItemImpl (id);
    }

    public override void OnSeekTo (long pos)
    {
        OnSeekToImpl (pos);
    }

    public override void OnPlayFromMediaId (string mediaId, Bundle extras)
    {
        OnPlayFromMediaIdImpl (mediaId, extras);
    }

    public override void OnPause ()
    {
        OnPauseImpl ();
    }

    public override void OnStop ()
    {
        OnStopImpl ();
    }

    public override void OnSkipToNext ()
    {
        OnSkipToNextImpl ();
    }

    public override void OnSkipToPrevious ()
    {
        OnSkipToPreviousImpl ();
    }

    public override void OnCustomAction (string action, Bundle extras)
    {
        OnCustomActionImpl (action, extras);
    }

    public override void OnPlayFromSearch (string query, Bundle extras)
    {
        OnPlayFromSearchImpl (query, extras);
    }
}

并像这样使用它:

var mediaCallback = new MediaSessionCallback ();

mediaCallback.OnPlayImpl = () => {
    LogHelper.Debug (Tag, "play");

};

mediaCallback.OnSkipToQueueItemImpl = (id) => {
    LogHelper.Debug (Tag, "OnSkipToQueueItem:" + id);

};

mediaCallback.OnSeekToImpl = (pos) => {
    LogHelper.Debug (Tag, "onSeekTo:", pos);

};

mediaCallback.OnPlayFromMediaIdImpl = (mediaId, extras) => {
    LogHelper.Debug (Tag, "playFromMediaId mediaId:", mediaId, "  extras=", extras);

};

mediaCallback.OnPauseImpl = () => {
    LogHelper.Debug (Tag, "pause. current state=" + playback.State);

};

mediaCallback.OnStopImpl = () => {
    LogHelper.Debug (Tag, "stop. current state=" + playback.State);

};

mediaCallback.OnSkipToNextImpl = () => {
    LogHelper.Debug (Tag, "skipToNext");

};

mediaCallback.OnSkipToPreviousImpl = () => {

};

mediaCallback.OnCustomActionImpl = (action, extras) => {

};

mediaCallback.OnPlayFromSearchImpl = (query, extras) => {
    LogHelper.Debug (Tag, "playFromSearch  query=", query);

};

幸运的是，甚至还有一个用于实现音乐服务的示例:

https://github.com/xamarin/monodroid-samples/blob/master/android5.0/MediaBrowserService/MediaBrowserService/MusicService.cs