弧形排列的自定义布局

public class ArcMenuToolLayout extends RelativeLayout {


    private int[] viewsPerRadius; //每个字view的角度

    public ArcMenuToolLayout(Context context) {
        super(context);
    }

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


    /**
     * 设置每个child的角度（若不设置则默认为平分后的中间角度）
     * @param viewsPerRadius
     */
    public void setViewsPerRadius(int[] viewsPerRadius) {
        this.viewsPerRadius = viewsPerRadius;
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        int count = getChildCount();
        int perDegree = 90/count;
        int left;
        int top;
        int finalPerDegree;
        for (int i = 0;i