Example usage for android.hardware.camera2 CaptureResult LENS_FOCUS_DISTANCE

Introduction

In this page you can find the example usage for android.hardware.camera2 CaptureResult LENS_FOCUS_DISTANCE.

Prototype

Key LENS_FOCUS_DISTANCE

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Document

Desired distance to plane of sharpest focus, measured from frontmost surface of the lens.

Should be zero for fixed-focus cameras

Units: See CameraCharacteristics#LENS_INFO_FOCUS_DISTANCE_CALIBRATION android.lens.info.focusDistanceCalibration for details

Range of valid values:
>= 0

Optional - This value may be null on some devices.

Full capability - Present on all camera devices that report being CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL devices in the CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel key

Usage

From source file:com.android.camera.one.v2.OneCameraZslImpl.java

@Override
public void setFocusDistanceListener(FocusDistanceListener focusDistanceListener) {
    if (mFocusDistanceListener == null) {
        mCaptureManager.addMetadataChangeListener(CaptureResult.LENS_FOCUS_DISTANCE,
                new ImageCaptureManager.MetadataChangeListener() {
                    @Override/*from   ww  w.j a va2  s. co m*/
                    public void onImageMetadataChange(Key<?> key, Object oldValue, Object newValue,
                            CaptureResult result) {
                        Integer state = result.get(CaptureResult.LENS_STATE);

                        // Forward changes if we have a new value and the camera
                        // A) Doesn't support lens state or B) lens state is
                        // reported and it is reported as moving.
                        if (newValue != null && (state == null || state == CameraMetadata.LENS_STATE_MOVING)) {
                            mFocusDistanceListener.onFocusDistance((float) newValue, mLensRange);
                        }
                    }
                });
    }
    mFocusDistanceListener = focusDistanceListener;
}

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