如何在android画布中旋转圆圈

public class CircleView extends View {
    private Paint mPaint;
    private float mRotation;

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

    public CircleView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CircleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mPaint = new Paint();
        mPaint.setColor(Color.RED);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setAntiAlias(true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        
        int centerX = getWidth() / 2;
        int centerY = getHeight() / 2;
        int radius = Math.min(centerX, centerY) - 10;
        
        canvas.rotate(mRotation, centerX, centerY);
        canvas.drawCircle(centerX, centerY, radius, mPaint);
    }

    public void setRotation(float rotation) {
        mRotation = rotation;
        invalidate();
    }
}

public class MainActivity extends AppCompatActivity {
    private CircleView mCircleView;
    private float mRotation;

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

        mCircleView = findViewById(R.id.circle_view);

        // 通过定时器不断更新旋转角度，实现圆圈的旋转效果
        Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                mRotation += 5;
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mCircleView.setRotation(mRotation);
                    }
                });
            }
        }, 0, 50);
    }
}

<com.example.CircleView
    android:id="@+id/circle_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />