效果图预览
绘制思路
这里使用了中学解析几何知识 XPoint = OPointX = OPointXcosθ； YPoint = OPointY = OPointYsinθ；
canvas.drawText(lists.get(i).getName(), XPoint + (float) Math.cos(pere * i + 5) * radius[i % radius.length] - 30, YPoint + (float) Math.sin(pere * i + 5) * radius[i % radius.length] + 35, paint);
用法
1、XML布局（PS要根据自己的包名） <com.gkzy.relation.CirclePeopleView
android:id="@+id/layout_cricle_people"
android:layout_width="match_parent"
android:layout_height="280dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
2. peopleView = findViewById(R.id.layout_cricle_people);
3. 添加数据，刷新UI peopleView.SetFieldInfo(lists);
peopleView.invalidate();
4.添加了view的点击事件，通过手势判断。原理：
每个圆的Cx,Cy,r都能获取到，然后通过已知数据计算RectF的
left, top, right, bottom
/**
* Create a new rectangle with the specified coordinates. Note: no range
* checking is performed, so the caller must ensure that left <= right and
* top <= bottom.
*
* @param left The X coordinate of the left side of the rectangle
* @param top The Y coordinate of the top of the rectangle
* @param right The X coordinate of the right side of the rectangle
* @param bottom The Y coordinate of the bottom of the rectangle
*/
public RectF(float left, float top, float right, float bottom) {
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
得到RectF后判断contains(x,y)来获得点击的位置项目源码：GitHub - chenhua1008611/Co-People: 仿天眼查关系图的生成，自定义view，随机颜色，随机大小
