如何获取Android下的弧形动态变色动画？

<com.example.arcview.ArcView
    android:id="@+id/arcView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

public class ArcView extends View {

    private Paint paint;
    private RectF rectF;
    private float startAngle;
    private float sweepAngle;
    private int color;

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

    private void init() {
        paint = new Paint();
        paint.setAntiAlias(true);
        rectF = new RectF();
        startAngle = 0;
        sweepAngle = 0;
        color = Color.RED;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        paint.setColor(color);
        canvas.drawArc(rectF, startAngle, sweepAngle, true, paint);
    }

    public void setStartAngle(float startAngle) {
        this.startAngle = startAngle;
        invalidate();
    }

    public void setSweepAngle(float sweepAngle) {
        this.sweepAngle = sweepAngle;
        invalidate();
    }

    public void setColor(int color) {
        this.color = color;
        invalidate();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        rectF.set(0, 0, w, h);
    }
}

public class MainActivity extends AppCompatActivity {

    private ArcView arcView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        arcView = findViewById(R.id.arcView);

        // 创建动画
        ValueAnimator animator = ValueAnimator.ofFloat(0, 360);
        animator.setDuration(2000);
        animator.setRepeatCount(ValueAnimator.INFINITE);
        animator.setRepeatMode(ValueAnimator.REVERSE);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float angle = (float) animation.getAnimatedValue();
                arcView.setStartAngle(angle);
                arcView.setSweepAngle(angle);
                arcView.setColor(getRandomColor());
            }
        });

        // 启动动画
        animator.start();
    }

    private int getRandomColor() {
        Random random = new Random();
        return Color.rgb(random.nextInt(256), random.nextInt(256), random.nextInt(256));
    }
}