Close CameraDevice in a seperate thread

Question

I am using Android camera2 to create a custom camera. The cameraDevice.close() method is slow and it makes UI freeze for 1 sec. I put it in another thread and it seems to work j

Answer 1

As far as I know, such freeze with cameraDevice.close() happens on some unfortunate devices, and sometimes is cured by performing a normal system upgrade.

But this is a little consolation if this happens to you, on your device. Actually, you are kind of lucky that you can prepare a fix for that. The end-users of your app will benefit from your misfortune.

Your code looks OK, if it delivers desired improvements for you. As I explained, it may be hard to reproduce this problem on another device.

I would rather put all closeCamera() logic on the same background thread. If you provided a Handler to openCamera(), as in the official example,

manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);

then I would suggest posting all closeCamera() sequence to this mBackgroundHandler.