如何在android studio中让画布跟随手指绘制平滑的曲线

<com.example.myapp.SmoothCurveView
    android:id="@+id/smoothCurveView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

public class SmoothCurveView extends View {
    private Paint paint;
    private Path path;

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

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

    private void init() {
        paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(5);

        path = new Path();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawPath(path, paint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                path.moveTo(x, y);
                return true;
            case MotionEvent.ACTION_MOVE:
                path.lineTo(x, y);
                break;
            case MotionEvent.ACTION_UP:
                // Do any necessary cleanup here
                break;
            default:
                return false;
        }

        invalidate();
        return true;
    }
}