What's the correct way to implement Tap To Focus for camera?

Question

I\'m working on an app which has a custom camera screen, for which I\'m supposed to implement tap to focus, like in the Android(more specifically, the Galaxy S4) camera app.

Answer 1

I have the same issue. I've checked this on many devices, and many Android versions.

It appears that focus-area is not working in CONTINUOUS focus-mode.

My workaround is to set focus-mode to AUTO or MACRO along with setting focus-area:

params.setFocusMode(Camera.Parameters.FOCUS_MODE_MACRO);
params.setFocusAreas(focusAreas);
mCamera.setParameters(params);

Please note that the stock Camera app on Galaxy S3 & S4 works the same way: it's permanently in continuous mode. When you touch the screen it switches to auto & sets focus-area. But after a while it comes back to continuous mode, and focus-area goes back to the center of the screen.

I hope this helps you somehow.