当调用onAddStream（）时，无法在VideoRenderer中加载远程视频轨道

Question

我在android中实现了webrtc。在peerConnection对象中设置remoteDescription后，我无法加载远程视频流。 我正在获取远程音频，视频轨道，当onAddStream（）被驱动时（org.webrtc.VideoTrack@37471a54）。但是无法在Videorenderer中加载它。

@Override
        public void onAddStream(final MediaStream stream) {
            Log.d("checklog","onaddstream"+stream.audioTracks.get(0)+stream.videoTracks.get(0));
            executor.execute(new Runnable() {
                @Override
                public void run() {
                    if (peerConnection == null ) {
                        return;
                    }
                    if (stream.audioTracks.size() > 1 || stream.videoTracks.size() > 1) {
                        Log.d("onAddstreamerror","Weird-looking stream: " + stream);
                        return;
                    }
                    if (stream.videoTracks.size() == 1) {
                        remoteVideoTrack = stream.videoTracks.get(0);
                        remoteVideoTrack.setEnabled(true);
                        remoteVideoTrack.addRenderer(new VideoRenderer(remoteRender));
                    }
                }
            });
        }