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