SDK 只支持每个 app 创建一个 RtcEngine 实例,如果要创建两个实例,需要创建两个进程的,可以参考类似功能的 demo:

https://github.com/AgoraIO/Advanced-Video/blob/dev/win-screenshare/Screensharing/Agora-Screen-Sharing-Android/README.zh.md