Abnormal opening of color camera preview

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我发现使用 Sensor.start()开Color流的时候会抛出一个这样的讯息。
The application may be doing too much work on its main thread。
另外我还发现当使用demo预览IR视频流在关闭后 深度相机还是处于工作状态（深度相机还在继续发红光） 此时在打开Color预览会打不开，需要先打开一下depth预览后关闭才可以关闭深度相机（红光消失） 然后在打开color预览才正常。

I found that when using Sensor. start() to open the Color stream, a message like this is thrown.
The application may be doing too much work on its main thread.

In addition, I also found that when using the demo preview IR video stream, the depth camera is still in working mode (the depth camera is still emitting red light). At this time, when opening the Color preview, it will not be able to open. You need to first open the Depth preview and then close it to close the depth camera (the red light disappears), and then open the Color preview to work normally.