ZXing CaptureActivity黑屏问题
Project Member #1 srowenThe app doesn't use a TabHost. If you are writing your own app, indeed, you may need to write different code! this part is not a library that is supposed to work in other contexts.

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? ?虽然项目采用tabactivity搭建框架，但CaptureActivity是单独的activity。

? ?针对surfaceDestroyed在activity切换时不会总是调用的问题，https://github.com/commonsguy/cw-advandroid/tree/master/Camera/Preview/?的解决方法值的参考。

也即是把打开摄像头的动作延迟到surfaceChanged时调用。