OpenCamera拍照的代码流程

　　按理来说，拍照应该是很简单的。随着功能的复杂，代码也是越来越多，流程越来越长。想看看地理位置是怎么保存的，于是就研究了一下OpenCamera的拍照流程。在回调时有点乱。

• MainActivity

clickedTakePhoto()
takePicture()
takePicturePressed()

• Preview

takePicturePressed()
takePicture()
takePhoto()。这里注册了一个自动对焦回调CameraController.AutoFocusCallback 。

Camera.AutoFocusCallback.onAutoFocus()
CameraController.AutoFocusCallback.onAutoFocus()
takePhotoWhenFocused()。这里注册了一个回调CameraController.PictureCallback

• Camera1Controller

takePictureNow()。注册了一个回调Camera.PictureCallback()

Camera.PictureCallback.onPictureTaken()

CameraController.PictureCallback.onPictureTaken()

• MyApplicationInterface

onPictureTaken()
saveImage()

• ImageSaver

saveImageJpeg()
saveImage()(Request)
saveSingleImageNow()