问题
I'm trying to develop a custom application that uses Camera 2 API and I would like to add the feature "tap to focus". In other words, when I tap on the screen to focus, it shows a circle of the focus area.
How can I draw the circle focus area?
I followed the Google Camera2Basic example.
Thank you.
回答1:
May be enough is draw circle of tap area, not focus area? In this case You can save X and Y pos of tap and use it as center of circle. And You can use any tutorial for drawing over camera preview, like that.
来源：https://stackoverflow.com/questions/40510161/android-camera2-draw-circle-focus-area