Implement Tap to Focus in Camera2 API

Question

i want to implement tap to focus feature in my custom camera. This is the basic code provided by Google https://github.com/googlesamples/android-Camera2Basic

Here\'s

Answer 1

1. Use the onTouch listener to get the point where the user touch the screen.
2. Calculate a/some MeteringRectangle(s) based on that position.

3. Use this metering rectangles to set the CaptureRequest.CONTROL_AF_REGION & CaptureRequest.CONTROL_AE_REGION

4. set the CaptureRequest.CONTROL_AF_MODE to CaptureRequest.CONTROL_AF_MODE_AUTO

5. CaptureRequest.CONTROL_AF_TRIGGER to CameraMetadata.CONTROL_AF_TRIGGER_START

6. CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER to CameraMetadata.CONTROL_AE_TRIGGER_START

7. Then build capture request

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Here you can find a full example.

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