android 简单环形比例图

好久不写博客了 最近项目中用到一个环形比例图，分享一下
先上效果图

List list = new ArrayList();
list.add(new String[]{"0.2", "#9B9B9B"});//gray
list.add(new String[]{"0.3", "#29C7BA"});//theme
list.add(new String[]{"0.4", "#518ef8"});//blue
list.add(new String[]{"0.05", "#ff9500"});//yellow
list.add(new String[]{"0.05", "#F67D88"});//tip
ervScale.setAngleAndColorList(list);

public class EasyRingView extends View {
    private Context mContext;
    private Paint mPaint;
    private int mDefaultColor;
    private float mRingWidth;
    private List mAngleAndColorList;
    public EasyRingView(Context context) {
        this(context, null);
    }
    public EasyRingView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public EasyRingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
        init();
    }
    private void init() {
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setStyle(Paint.Style.STROKE);
        mRingWidth = Utils.dp2px(mContext, 20);
        mPaint.setStrokeWidth(mRingWidth);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mDefaultColor = ContextCompat.getColor(mContext, R.color.gray);
    }
    public void setRingWidth(float width) {
        mRingWidth = width;
        if (mPaint != null) {
            mPaint.setStrokeWidth(width);
            invalidate();
        }
    }
    public void setAngleAndColorList(@NonNull List scaleAndColorList) {
        if (mAngleAndColorList == null) {
            mAngleAndColorList = new ArrayList();
        } else {
            mAngleAndColorList.clear();
        }
        if (scaleAndColorList.size() == 0) {
            mAngleAndColorList.add(new AngleAndColorBean(360, mDefaultColor));
        } else {
            float angleSum = 0;
            for (String[] scaleAndColor : scaleAndColorList) {
                float angle;
                try {
                    angle = Float.parseFloat(scaleAndColor[0]) * 360;
                } catch (NumberFORMatException e) {
                    angle = 0;
                }
                int color;
                try {
                    color = Color.parseColor(scaleAndColor[1]);
                } catch (Exception e) {
                    color = mDefaultColor;
                }
                if (angle > 0) {
                    mAngleAndColorList.add(new AngleAndColorBean(angle, color));
                    angleSum += angle;
                }
            }
            if (angleSum  0) {
                //avoid sum not equal 360
                Collections.sort(mAngleAndColorList, (o1, o2) -> {
                    if (o1.getAngle() > o2.getAngle()) {
                        return 1;
                    } else if (o1.getAngle()  1) {
            float startAngle = -90;
            for (int i = mAngleAndColorList.size() - 1; i >= 0; i--) {
                AngleAndColorBean angleAndColorBean = mAngleAndColorList.get(i);
                mPaint.setColor(angleAndColorBean.getColor());
                canvas.drawArc(left, top, right, bottom, startAngle - angleAndColorBean.getAngle(), angleAndColorBean.getAngle(), false, mPaint);
                startAngle -= angleAndColorBean.getAngle();
            }
            //avoid the last scale has two corner
            AngleAndColorBean lastBean = mAngleAndColorList.get(mAngleAndColorList.size() - 1);
            mPaint.setColor(lastBean.getColor());
            canvas.drawArc(left, top, right, bottom, -90 - lastBean.getAngle() / 2, lastBean.getAngle() / 2, false, mPaint);
        } else {
            mPaint.setColor(mAngleAndColorList.get(0).getColor());
            canvas.drawArc(left, top, right, bottom, 0, 360, false, mPaint);
        }
    }
    private class AngleAndColorBean {
        //所占角度
        private float angle;
        //色值
        private int color;
        AngleAndColorBean(float angle, int color) {
            this.angle = angle;
            this.color = color;
        }
        float getAngle() {
            return angle;
        }
        void setAngle(float angle) {
            this.angle = angle;
        }
        public int getColor() {
            return color;
        }
        public void setColor(int color) {
            this.color = color;
        }
    }
}