Camera
CameraManager
DecodeHandler
tryInitCamera
扫码时序图
restartPreviewAndDecode()
what=SUCCEEDED或者FAILED
handleDecode
handlerMessage
what = DECODEobj = byte[] data
checkSelfPermisstion
QRcodeCaptureActivity
PreviewCallback
CaptureActivitHandler
sendMessage
decodeadvanceDecodeLooper.myLooper().quit()反色decode
