package com.admin.sole.raiskid.view; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import com.admin.sole.raiskid.utils.CustomLog; import java.util.ArrayList; import java.util.List; public class FlowLayout extends ViewGroup { private static final String TAG = "FlowLayout"; public FlowLayout(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected ViewGroup.LayoutParams generateLayoutParams( ViewGroup.LayoutParams p) { return new MarginLayoutParams(p); } @Override public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) { return new MarginLayoutParams(getContext(), attrs); } @Override protected ViewGroup.LayoutParams generateDefaultLayoutParams() { return new MarginLayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); } /** * 负责设置子控件的测量模式和大小 根据所有子控件设置自己的宽和高 */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 获得它的父容器为它设置的测量模式和大小 final int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); final int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); final int modeWidth = MeasureSpec.getMode(widthMeasureSpec); final int modeHeight = MeasureSpec.getMode(heightMeasureSpec); CustomLog.e(TAG, sizeWidth + "," + sizeHeight); // 如果是warp_content情况下，记录宽和高 int width = 0; int height = 0; /** * 记录每一行的宽度，width不断取最大宽度 */ int lineWidth = 0; /** * 每一行的高度，累加至height */ int lineHeight = 0; final int cCount = getChildCount(); // 遍历每个子元素 for (int i = 0; i < cCount; i++) { final View child = getChildAt(i); // 测量每一个child的宽和高 measureChild(child, widthMeasureSpec, heightMeasureSpec); // 得到child的lp final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); // 当前子空间实际占据的宽度 final int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; // 当前子空间实际占据的高度 final int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; /** * 如果加入当前child，则超出最大宽度，则的到目前最大宽度给width，类加height 然后开启新行 */ if (lineWidth + childWidth > sizeWidth) { width = Math.max(lineWidth, childWidth); // 取最大的 lineWidth = childWidth; // 重新开启新行，开始记录 // 叠加当前高度， height += lineHeight; // 开启记录下一行的高度 lineHeight = childHeight; } else // 否则累加值lineWidth,lineHeight取最大高度 { lineWidth += childWidth; lineHeight = Math.max(lineHeight, childHeight); } // 如果是最后一个，则将当前记录的最大宽度和当前lineWidth做比较 if (i == cCount - 1) { width = Math.max(width, line Width); height += lineHeight; } } setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth : width, (modeHeight == MeasureSpec.EXACTLY) ? sizeHeight : height); } /** * 存储所有的View，按行记录 */ private List
    
     
      > mAllViews = new ArrayList<>(); /** * 记录每一行的最大高度 */ private List
      
        mLineHeight = new ArrayList<>(); @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mAllViews.clear(); mLineHeight.clear(); int width = getWidth(); int lineWidth = 0; int lineHeight = 0; // 存储每一行所有的childView List
       
         lineViews = new ArrayList<>(); final int cCount = getChildCount(); // 遍历所有的孩子 for (int i = 0; i < cCount; i++) { final View child = getChildAt(i); MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); final int childWidth = child.getMeasuredWidth(); final int childHeight = child.getMeasuredHeight(); // 如果已经需要换行 if (childWidth + lp.leftMargin + lp.rightMargin + lineWidth > width) { // 记录这一行所有的View以及最大高度 mLineHeight.add(lineHeight); // 将当前行的childView保存，然后开启新的ArrayList保存下一行的childView mAllViews.add(lineViews); lineWidth = 0;// 重置行宽 lineViews = new ArrayList<>(); } /** * 如果不需要换行，则累加 */ lineWidth += childWidth + lp.leftMargin + lp.rightMargin; lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottom Margin); lineViews.add(child); } // 记录最后一行 mLineHeight.add(lineHeight); mAllViews.add(lineViews); int left = 0; int top = 0; // 得到总行数 final int lineNums = mAllViews.size(); for (int i = 0; i < lineNums; i++) { // 每一行的所有的views lineViews = mAllViews.get(i); // 当前行的最大高度 lineHeight = mLineHeight.get(i); CustomLog.e(TAG, "第" + i + "行 ：" + lineViews.size() + " , " + lineViews); CustomLog.e(TAG, "第" + i + "行， ：" + lineHeight); // 遍历当前行所有的View for (int j = 0; j < lineViews.size(); j++) { final View child = lineViews.get(j); if (child.getVisibility() == View.GONE) { continue; } final MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); // 计算childView的left,top,right,bottom final int lc = left + lp.leftMargin; final int tc = top + lp.topMargin; final int rc = lc + child.getMeasuredWidth(); final int bc = tc + child.getMeasuredHeight(); CustomLog.e(TAG, child + " , l = " + lc + " , t = " + t + " , r =" + rc + " , b = " + bc); child.layout(lc, tc, rc, bc); left += child.getMeasuredWidth() + lp.rightMargin + lp.leftMargin; } left = 0; top += lineHeight; } }}