我正在尝试为我的 xamarin 媒体应用程序提供锁屏控制。我还没有多少运气,但一直在尝试遵循https://www.youtube.com/watch?v=KNsELLrZ3V0 上的本教程。我已经在我的项目中实现了大部分内容,但是有一部分我不确定在将他们的 java 转换为我的 C# 时如何去做。我将在下面发布代码,但跳到我正在谈论的视频中的部分可能更容易。
在他们开始构建 initMediaSession 方法的视频中的 6:50 处,我陷入了困境。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,而且我无法让 mSession.SetCallback(new MediaSession.Callback(){} 不出错。
我得到的主要错误是“无法创建抽象类或接口‘MediaSession.Callback’的实例”
或者,如果您有更好的策略将媒体控件放到 android 锁屏上,请告诉我。谢谢你。
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);
}
});
你不需要翻译任何东西,你只需要实现现有的MediaSession.Callback
接口。
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:
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