自定义loading（转圈的圆点）

网上例子不少 当然我也是看了那个AV什么什么的里面写法 我自己这个就是简单罢了 正好项目用 我就弄出来了 顺便写这上面留作备用吧

效果图！！水印挡的严严实实 破软件

/**
 * @ProjectName: BigDemo
 * @Package: com.example.bigdemo
 * @ClassName: CustomLoadingView
 * @Description: 自定义loadingView
 * @Author: 郑伟
 * @CreateDate: 2019/8/23 18:38
 * @UpdateUser: 更新者
 * @UpdateDate: 2019/8/23 18:38
 * @UpdateRemark: 更新说明
 * @Version: 1.0
 */
public class CustomLoadingView extends View {

    public static final float SCALE = 1.0f;

    public static final int ALPHA = 255;

    private Paint mPaint;

    private ArrayList<ValueAnimator> mAnimators;

    private HashMap<ValueAnimator, ValueAnimator.AnimatorUpdateListener> mUpdateListeners = new HashMap<>();

    private float[] scaleFloats = new float[]{SCALE,
            SCALE,
            SCALE,
            SCALE,
            SCALE,
            SCALE,
            SCALE,
            SCALE};

    private int[] alphas = new int[]{ALPHA,
            ALPHA,
            ALPHA,
            ALPHA,
            ALPHA,
            ALPHA,
            ALPHA,
            ALPHA};

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

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

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

    private void init(Context context) {
        mPaint = new Paint();
        mPaint.setColor(0x642700);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setAntiAlias(true);
        onCreateAnimators();
        startAnimators();
    }


    /**
     * 启动动画
     */
    public void startAnimators() {
        for (int i = 0; i < mAnimators.size(); i++) {
            ValueAnimator animator = mAnimators.get(i);
            ValueAnimator.AnimatorUpdateListener updateListener = mUpdateListeners.get(animator);
            if (updateListener != null) {
                animator.addUpdateListener(updateListener);
            }
            animator.start();
        }
    }

    /**
     * 停止动画
     */
    public void stopAnimators() {
        if (mAnimators != null) {
            for (ValueAnimator animator : mAnimators) {
                if (animator != null && animator.isStarted()) {
                    animator.removeAllUpdateListeners();
                    animator.end();
                }
            }
        }
    }

    public void setColor(int color){
        mPaint.setColor(color);
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);

        if (widthMode == MeasureSpec.AT_MOST) {
            widthSize = 50;
        }

        if (heightMode == MeasureSpec.AT_MOST) {
            heightSize = 50;
        }
        setMeasuredDimension(widthSize, heightSize);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        float radius = getWidth() / 10;
        for (int i = 0; i < 8; i++) {
            canvas.save();
            Point point = circleAt(getWidth(), getHeight(), getWidth() / 2 - radius, i * (Math.PI / 4));
            canvas.translate(point.x, point.y);
            canvas.scale(scaleFloats[i], scaleFloats[i]);
            mPaint.setAlpha(alphas[i]);
            canvas.drawCircle(0, 0, radius, mPaint);
            canvas.restore();
        }
    }


    private Point circleAt(int width, int height, float radius, double angle) {
        float x = (float) (width / 2 + radius * (Math.cos(angle)));
        float y = (float) (height / 2 + radius * (Math.sin(angle)));
        return new Point(x, y);
    }

    private final class Point {
        private float x;
        private float y;

        private Point(float x, float y) {
            this.x = x;
            this.y = y;
        }
    }

    private void addUpdateListener(ValueAnimator animator, ValueAnimator.AnimatorUpdateListener updateListener) {
        mUpdateListeners.put(animator, updateListener);
    }

    private void onCreateAnimators() {
        ArrayList<ValueAnimator> animators = new ArrayList<>();
        int[] delays = {0, 120, 240, 360, 480, 600, 720, 780, 840};
        for (int i = 0; i < 8; i++) {
            final int index = i;
            ValueAnimator scaleAnim = ValueAnimator.ofFloat(1, 0.4f, 1);
            scaleAnim.setDuration(1000);
            scaleAnim.setRepeatCount(-1);
            scaleAnim.setStartDelay(delays[i]);
            addUpdateListener(scaleAnim, new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    scaleFloats[index] = (float) animation.getAnimatedValue();
                    postInvalidate();
                }
            });

            ValueAnimator alphaAnim = ValueAnimator.ofInt(255, 77, 255);
            alphaAnim.setDuration(1000);
            alphaAnim.setRepeatCount(-1);
            alphaAnim.setStartDelay(delays[i]);
            addUpdateListener(alphaAnim, new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    alphas[index] = (int) animation.getAnimatedValue();
                    postInvalidate();
                }
            });
            animators.add(scaleAnim);
            animators.add(alphaAnim);
        }
        mAnimators = animators;
    }
}