Merge "Add shadow to make the sensor area visible on white background"

public class UdfpsView extends View {

    private static final String TAG = "UdfpsView";

    // Values in pixels.

    private static final float SENSOR_SHADOW_OFFSET = 2.0f;

    private static final float SENSOR_OUTLINE_WIDTH = 2.0f;

    private final Rect mScrimRect;

    private final Paint mScrimPaint;

            a.recycle();

        }

        mScrimRect = new Rect();

        mScrimPaint = new Paint(0 /* flags */);

        mScrimPaint.setColor(Color.BLACK);

        mSensorPaint = new Paint(0 /* flags */);

        mSensorPaint.setColor(Color.WHITE);

        mSensorPaint.setStyle(Paint.Style.STROKE);

        mSensorPaint.setStrokeWidth(SENSOR_OUTLINE_WIDTH);

        mSensorPaint.setShadowLayer(SENSOR_OUTLINE_WIDTH, 0, 0, Color.BLACK);

        mSensorPaint.setAntiAlias(true);

        mTouchableRegion = new Rect();

        mInsetsListener = internalInsetsInfo -> {

        mSensorY = h - mSensorMarginBottom - mSensorRadius;

        mSensorRect.set(mSensorX - mSensorRadius, mSensorY - mSensorRadius,

                mSensorX + mSensorRadius, mSensorY + mSensorRadius);

        // Sets mTouchableRegion with rounded up values from mSensorRect.

        mSensorRect.roundOut(mTouchableRegion);

        getViewTreeObserver().addOnComputeInternalInsetsListener(mInsetsListener);