android - RemoteMediaPlayer 媒体状态为空与 Cast 配套库

Question

我正在尝试创建一个简单的应用，使用 Cast 配套库在 Chromecast 上流式传输视频。

我正在做的事情非常简单。我有一个使用以下代码的 Activity :

    private VideoCastManager mVideoCastManager;


    @Override
    protected void onCreate(Bundle savedInstanceState)
    { 
        mVideoCastManager = CastHelper.getVideoCastManager(this);
    }

还有一个名为 CastHelper 的类，只有一个方法:

    private static final String APPLICATION_ID = CastMediaControlIntent.DEFAULT_MEDIA_RECEIVER_APPLICATION_ID;
    private static VideoCastManager mCastMgr;

    public static VideoCastManager getVideoCastManager(Context ctx)
    {
        if (mCastMgr == null)
        {
            mCastMgr = VideoCastManager.initialize(ctx, APPLICATION_ID, null, null);
            mCastMgr.enableFeatures(VideoCastManager.FEATURE_NOTIFICATION
                    | VideoCastManager.FEATURE_DEBUGGING);
        }
        mCastMgr.setContext(ctx);
        return mCastMgr;
    }

当我启动应用程序时，操作栏中有媒体按钮，我可以选择一个设备。但是，我有一个错误:

03-26 19:18:47.890: D/ccl_VideoCastManager(9874): Registering MediaChannel namespace
03-26 19:18:47.900: D/ccl_VideoCastManager(9874): onApplicationStatusChanged() reached: Ready To Cast
03-26 19:18:50.203: D/ccl_VideoCastManager(9874): RemoteMediaPlayer::onStatusUpdated() is reached
03-26 19:18:50.203: D/ccl_VideoCastManager(9874): onRemoteMediaPlayerStatusUpdated() reached
03-26 19:18:50.203: D/ccl_VideoCastManager(9874): mApiClient or mRemoteMediaPlayer is null, so will not proceed

实际上问题出在那个 block 上:

 if (null == mApiClient || null == mRemoteMediaPlayer ||
                null == mRemoteMediaPlayer.getMediaStatus()) {
            LOGD(TAG, "mApiClient or mRemoteMediaPlayer is null, so will not proceed");
            return;
 }

RemoteMediaPlayer 实例正常，但 getMediaStatus 方法返回 null。请注意，我什至还没有加载媒体。

我做错了什么？

编辑正如 Ali Naddaf 所指出的，也许这段代码没有任何问题，但是当我添加 VideoCastConsumerImpl 时，从未调用过 onApplicationConnected，所以我认为这可能是原因。

IVideoCastConsumer mCastConsumer = new VideoCastConsumerImpl()
        {


            @Override
            public void onConnected()
            {
                super.onConnected();


            }

            @Override
            public void onApplicationConnected(ApplicationMetadata appMetadata, String sessionId, boolean wasLaunched)
            {
                super.onApplicationConnected(appMetadata, sessionId, wasLaunched);
                //Trying to load a media here, but never called

            }

        };
mVideoCastManager.addBaseCastConsumer(mCastConsumer);

Answer 1

将 mVideoCastManager.addBaseCastConsumer(mCastConsumer); 更改为 mVideoCastManager.addVideoCastConsumer(mCastConsumer); 看看是否有帮助。