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);
}
}
}
}