Android编程重写ViewGroup实现卡片布局的方法

package com.rong.activity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/**
 * 卡片布局
 * 
 * @author 徐荣
 *
 */
public class FlowLayout extends ViewGroup {
  public FlowLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    // 当前子View的数量
    int childSize = getChildCount();
    // 获取行宽
    int lineWidth = getMeasuredWidth();
    // 当前是第几行
    int lines = 1;
    // 当前累加的行宽
    int nowLineWidth = 0;
    for (int i = 0; i = lineWidth 则换行
      if (nowLineWidth + childWidth >= lineWidth) {
        nowLineWidth = 0;
        lines = lines + 1;
      }
      // 设置子View的位置
      view.layout(nowLineWidth, childHeight * (lines - 1), nowLineWidth + childWidth, childHeight * lines);
      nowLineWidth = nowLineWidth + childWidth;
      // 如果nowLineWidth >= lineWidth 则换行
      if (nowLineWidth >= lineWidth) {
        nowLineWidth = 0;
        lines = lines + 1;
      }
    }
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    // 设置自己View的大小
    setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
    for (int i = 0; i 

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