I am using camera2 api for my custom camera. I implemented touch to focus. It is working fine. But when I'm trying to attach external lens, it can't find focus distance, I have to try several times. Native camera works perfectly even with the lens. What else should I consider? Any opinions? please guide.
(For the further usage) I ended up the solution using samsung camera sdk. It is working perfectly
来源：https://stackoverflow.com/questions/42090124/searching-focus-keeps-failing-with-external-lens-camera2-api-in-android