如何在Android中制作带有自定义阴影的长椭圆形

public class OvalShadowView extends ImageView {
    private Paint mPaint;
    private int mShadowColor;
    private float mShadowRadius;
    private float mShadowDx;
    private float mShadowDy;

    public OvalShadowView(Context context) {
        super(context);
        init();
    }

    public OvalShadowView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public OvalShadowView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mPaint = new Paint();
        mShadowColor = Color.GRAY;
        mShadowRadius = 10f;
        mShadowDx = 0f;
        mShadowDy = 0f;
        setLayerType(LAYER_TYPE_SOFTWARE, null); // 开启软件加速，以支持阴影效果
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        int width = getWidth();
        int height = getHeight();

        // 绘制椭圆形
        mPaint.setColor(Color.WHITE);
        canvas.drawOval(new RectF(0, 0, width, height), mPaint);

        // 绘制阴影
        mPaint.setColor(Color.TRANSPARENT);
        mPaint.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor);
        canvas.drawOval(new RectF(0, 0, width, height), mPaint);
    }
}

<com.example.myapplication.OvalShadowView
    android:layout_width="200dp"
    android:layout_height="100dp"
    android:background="@android:color/transparent"
    android:elevation="10dp"
    android:translationZ="10dp" />