How to chang focus by code in camera2 of android?

Question

I want to implement a function in a camera app in android that I can click a button than get 2 photo with different focus(not a manual focus function).

I've complete all except that my focus change part can't run, I can't find the cause, and try to analysis:

Try 1: I use the focus control code in this and this to change the focus, but it didn't work.

The cammera builder set part:

private CaptureRequest.Builder initDngBuilder() {
    CaptureRequest.Builder captureBuilder = null;
    try {
        captureBuilder = mCameraSession.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);

        captureBuilder.addTarget(mImageReader.getSurface());
        captureBuilder.addTarget(surface);
        // Required for RAW capture
        captureBuilder.set(CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE, CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE_ON);
        captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
        captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CameraMetadata.CONTROL_AF_MODE_OFF);
        captureBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, 0.1f);
        captureBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, (long) ((214735991 - 13231) / 2));
        captureBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 0);
        captureBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, (10000 - 100) / 2);
        captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, 90);
        CameraManager cameraManager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
        String cameraid = CameraCharacteristics.LENS_FACING_FRONT + "";
        CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraid);
        Range<Integer> fps[] = cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
        captureBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fps[fps.length - 1]);
    } catch (CameraAccessException e) {
        Toast.makeText(getActivity(), "reject", Toast.LENGTH_SHORT).show();
    } catch (NullPointerException e) {
        Toast.makeText(getActivity(), "fail", Toast.LENGTH_SHORT).show();
    }
    return captureBuilder;}
private CaptureRequest.Builder initDngBuilder2() {
CaptureRequest.Builder captureBuilder = null;
try {
    captureBuilder = mCameraSession.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
    captureBuilder.addTarget(mImageReader.getSurface());
    captureBuilder.addTarget(surface);
    // Required for RAW capture
    captureBuilder.set(CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE, CaptureRequest.STATISTICS_LENS_SHADING_MAP_MODE_ON);
    captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
    captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CameraMetadata.CONTROL_AF_MODE_OFF);
    captureBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, 100.0f);
    captureBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, (long) ((214735991 - 13231) / 2));
    captureBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 0);
    captureBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, (10000 - 100) / 2);
    captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, 90);
    CameraManager cameraManager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
    String cameraid = CameraCharacteristics.LENS_FACING_FRONT + "";
    CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraid);
    Range<Integer> fps[] = cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
    captureBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fps[fps.length - 1]);
} catch (CameraAccessException e) {
    Toast.makeText(getActivity(), "reject", Toast.LENGTH_SHORT).show();
} catch (NullPointerException e) {
    Toast.makeText(getActivity(), "fail", Toast.LENGTH_SHORT).show();
}
return captureBuilder;

}

The click listener part:

private View.OnClickListener picOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
    try {
        mCameraSession.capture(initDngBuilder().build(), null, mHandler);
        mCameraSession.capture(initDngBuilder2().build(), null, mHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}};

Try 2: I want to figure out if my android device don't have the ability(I consider that point because: https://stackoverflow.com/a/42912408/9521891), so I use:

int[] ints = mCameraCharacteristics.get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES);

for (int i = 0; i < ints.length; i++){
    Log.d(TAG, ints[i] + ",");
}

And I got only :" 0, ". Does it means the device don't have the ablility 'MANUAL_SENSOR'?

score 0 · Accepted Answer · answered Mar 20 '18 at 18:17

0

Yes, if the contents of REQUEST_AVAILABLE_CAPABILITIES only contains BACKWARD_COMPATIBLE (0), then the device does not support MANUAL_SENSOR.

Therefore, setting the LENS_FOCUS_DISTANCE to any value besides 0.0f (infinity focus) is not supported.

answered Mar 20 '18 at 18:17

Eddy Talvala

17,243
2
42
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Thank you, and I will try another android device to test my function. – Ara Chen Mar 22 '18 at 03:28

How to chang focus by code in camera2 of android?

1 Answers1