Android自定义View实现圆形环绕效果

package com.ihaveu.iuzuan.cardgame.widget;

import android.content.Context;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;

import com.ihaveu.iuzuan.cardgame.R;
import com.ihaveu.iuzuan.cardgame.util.MeasureUtil;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by zhouhui on 17-6-8.
 * 添加圆形子控件实现时钟环绕效果
 */

public class CircleImageLayout extends LinearLayout{

 private double mAngle = 0;//初始角度
 private int mX, mY;//子控件位置
 private int mWidth, mHeight;//控件长宽
 private int mRadius;//子控件距离控件圆心位置
 private int mCount;
 private List<CircleImageView> mCircleImageViewList;
 private CircleImageView mCircleImageView;

 public CircleImageLayout(Context context) {
  this(context, null);
 }

 public CircleImageLayout(Context context, @Nullable AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public CircleImageLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  mCircleImageViewList = new ArrayList<>();
 }

 /**
  * 设置子控件到控件圆心的位置
  */
 public void setRadius(int radius) {
  mRadius = radius;
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  mWidth = getMeasuredWidth();
  mHeight = getMeasuredHeight();
 }

 @Override
 protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
  super.onLayout(changed, left, top, right, bottom);
  initDraw();
 }

 public void initDraw() {
  mCount = getChildCount();
  for (int i = 0; i < mCount; i++) {
   View child = getChildAt(i);
   child.getWidth();
   child.getHeight();
   if (i == 0) {
    mX = mWidth / 2;
    mY = mHeight / 2;
   } else {
    mAngle = 180 - 180 / (mCount - 1) * (i - 1);
    mX = (int) (mWidth / 2 + Math.cos(Math.toRadians(mAngle)) * mRadius);
    mY = (int) (mHeight / 2 - Math.sin(Math.toRadians(mAngle)) * mRadius);
   }
   child.layout(mX - child.getWidth() / 2, mY - child.getHeight() / 2, mX + child.getWidth() / 2, mY + child.getHeight() / 2);
  }
 }

 /**
  * 初始化环绕数量半径
  */
 public void init(int count, int radius) {
  mRadius = radius;
  for (int i = 0; i < count + 1; i++) {
   CircleImageView imageView = new CircleImageView(getContext());
   if (i == 0) {
    //i为0时为圆型头像
    View view = LayoutInflater.from(getContext()).inflate(R.layout.layout_header, null, true);
    mCircleImageView = (CircleImageView) view.findViewById(R.id.iv_header);
    addView(view);
   } else {
    addView(imageView, MeasureUtil.dip2px(15), MeasureUtil.dip2px(15));
    mCircleImageViewList.add(imageView);
   }
  }
 }

}