自定义View实现画布手动or自动旋转，点击暂停，画布跟随鼠标移动

本文链接：https://blog.youkuaiyun.com/qq_41161483/article/details/79941690

本文介绍了一个自定义Android视图的实现案例，通过继承View并重写onDraw方法来绘制复杂的图形，如彩色扇形图案，并实现了触摸和定时动画效果。该视图能够响应触摸事件并使用计时器任务更新界面。

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**
 * author:Created by WeiWeifeng on 2018/4/12.
 */

public class Xiaoguo extends View implements View.OnClickListener {

    private RectF rectF;
    private Paint paint;
    private int centerX;
    private int centerY;
    private Paint paint1;
    private int[] colors;
    private Paint pai;
    private int stepAngle;
    float x=0;
    float y=0;


    public Xiaoguo(Context context) {
        this(context, null);
    }

    public Xiaoguo(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

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

    private void getInit() {
        setOnClickListener(this);
        //画笔
        paint = new Paint();
        paint.setColor(Color.GRAY);

        paint1 = new Paint();
        paint1.setColor(Color.RED);

        pai = new Paint();
        colors = new int[]{Color.BLUE, Color.RED, Color.YELLOW, Color.CYAN, Color.BLACK, Color.GREEN, Color.BLUE, Color.RED, Color.YELLOW, Color.CYAN, Color.BLACK, Color.GREEN};
        stepAngle = 360 / colors.length;
        //装扇形的矩形
        rectF = new RectF(-200, -200, 200, 200);
    }

    //测量
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int width = getMeasuredWidth();
        int height = getMeasuredHeight();
        centerX = width / 2;
        centerY = height / 2;
    }

    int d = 60;
    int dd = 60;

    //动画
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //设置远点在正中心
//        canvas.translate(point.x + centerX, point.y + centerY);
        canvas.translate(x + centerX, y + centerY);
//        canvas.translate(centerX,centerY);
        //让装扇形的矩形显示
//       canvas.drawRect(rectF,paint);
        canvas.rotate(d);
        //创建一个圆
//        canvas.drawCircle(, point.y, 200, paint);
        //创建一个扇形
//        canvas.drawArc(rectF, 0, 30, true, paint1);
        //旋转
        drawCircleWithColor(canvas);
    }

    private void drawCircleWithColor(Canvas canvas) {
        int angleStart = 0;
        for (int i = 0; i < colors.length; i++) {
            pai.setColor(colors[i]);
            canvas.drawArc(rectF, angleStart, stepAngle, true, pai);
            angleStart += stepAngle;
        }
    }

    int dian = 1;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                Log.e("myMessage", "ACTION_DOWN" + dian);

                break;
            case MotionEvent.ACTION_MOVE:
                x = event.getX() - centerX;
                y = event.getY() - centerY;
                Log.e("myMessage", "ACTION_MOVE" + y);

                dd += 10;
                postInvalidate();
                break;
            case MotionEvent.ACTION_UP:
                dian++;
                Log.e("myMessage", "ACTION_UP");
                break;

        }
        return super.onTouchEvent(event);
    }

    @Override
    public void onClick(View view) {
        Log.e("myMessage", "onClick");
        TimerTask timerTask = new TimerTask() {
            @Override
            public void run() {
                d += 10;
                if (dian % 2 == 0) {
                    Log.e("myMessage", "Dui");
                    postInvalidate();
                }
            }
        };
        Timer timer = new Timer();

        timer.schedule(timerTask, 2000, 30);


    }
}