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@@ -0,0 +1,126 @@
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+package com.sheep.gamegroup.view.customview;
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+
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+import android.content.Context;
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+import android.graphics.Rect;
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+import android.util.AttributeSet;
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+import android.view.View;
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+import android.view.ViewGroup;
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+
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+import java.util.HashMap;
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+import java.util.Map;
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+
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+public class FlowLayout extends ViewGroup {
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+
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+ public FlowLayout(Context context) {
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+ super(context);
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+ }
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+
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+ public FlowLayout(Context context, AttributeSet attrs) {
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+ super(context, attrs);
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+ }
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+
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+ public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
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+ super(context, attrs, defStyleAttr);
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+ }
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+
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+ @Override
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+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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+ // super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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+ //遍历去调用所有子元素的measure方法（child.getMeasuredHeight()才能获取到值，否则为0）
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+ measureChildren(widthMeasureSpec, heightMeasureSpec);
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+
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+ int measuredWidth = 0, measuredHeight = 0;
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+
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+ int widthSize = MeasureSpec.getSize(widthMeasureSpec);
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+ int widtMode = MeasureSpec.getMode(widthMeasureSpec);
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+ int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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+ int heightSize = MeasureSpec.getSize(heightMeasureSpec);
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+ //由于计算子view所占宽度，这里传值需要自身减去PaddingRight宽度，PaddingLeft会在接下来计算子元素位置时加上
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+ Map<String, Integer> compute = compute(widthSize - getPaddingRight());
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+
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+ //EXACTLY模式：对应于给定大小或者match_parent情况
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+ if (widtMode == MeasureSpec.EXACTLY) {
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+ measuredWidth = widthSize;
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+ //AT_MOS模式：对应wrap-content（需要手动计算大小，否则相当于match_parent）
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+ } else if (widtMode == MeasureSpec.AT_MOST) {
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+ measuredWidth = compute.get("allChildWidth");
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+ }
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+
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+ if (heightMode == MeasureSpec.EXACTLY) {
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+ measuredHeight = heightSize;
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+ } else if (heightMode == MeasureSpec.AT_MOST) {
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+ measuredHeight = compute.get("allChildHeight");
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+ }
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+ //设置flow的宽高
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+ setMeasuredDimension(measuredWidth, measuredHeight);
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+ }
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+
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+
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+ @Override
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+ protected void onLayout(boolean changed, int l, int t, int r, int b) {
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+ for (int i = 0; i < getChildCount(); i++) {
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+ View child = getChildAt(i);
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+ Rect rect = (Rect) getChildAt(i).getTag();
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+ child.layout(rect.left, rect.top, rect.right, rect.bottom);
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+ }
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+
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+ }
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+
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+ /**
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+ * 测量过程
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+ *
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+ * @param flowWidth 该view的宽度
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+ * @return 返回子元素总所占宽度和高度（用于计算Flowlayout的AT_MOST模式设置宽高）
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+ */
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+ private Map<String, Integer> compute(int flowWidth) {
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+ //是否是单行
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+ boolean aRow = true;
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+ MarginLayoutParams marginParams;//子元素margin
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+ int rowsWidth = getPaddingLeft();//当前行已占宽度(注意需要加上paddingLeft)
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+ int columnHeight = getPaddingTop();//当前行顶部已占高度(注意需要加上paddingTop)
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+ int rowsMaxHeight = 0;//当前行所有子元素的最大高度（用于换行累加高度）
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+
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+ for (int i = 0; i < getChildCount(); i++) {
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+
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+ View child = getChildAt(i);
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+ //获取元素测量宽度和高度
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+ int measuredWidth = child.getMeasuredWidth();
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+ int measuredHeight = child.getMeasuredHeight();
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+ //获取元素的margin
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+ marginParams = (MarginLayoutParams) child.getLayoutParams();
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+ //子元素所占宽度 = MarginLeft+ child.getMeasuredWidth+MarginRight 注意此时不能child.getWidth,因为界面没有绘制完成，此时wdith为0
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+ int childWidth = marginParams.leftMargin + marginParams.rightMargin + measuredWidth;
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+ int childHeight = marginParams.topMargin + marginParams.bottomMargin + measuredHeight;
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+ //判断是否换行： 该行已占大小+该元素大小>父容器宽度 则换行
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+
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+ rowsMaxHeight = Math.max(rowsMaxHeight, childHeight);
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+ //换行
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+ if (rowsWidth + childWidth > flowWidth) {
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+ //重置行宽度
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+ rowsWidth = getPaddingLeft() + getPaddingRight();
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+ //累加上该行子元素最大高度
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+ columnHeight += rowsMaxHeight;
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+ //重置该行最大高度
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+ rowsMaxHeight = childHeight;
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+ aRow = false;
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+ }
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+ //累加上该行子元素宽度
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+ rowsWidth += childWidth;
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+ //判断时占的宽段时加上margin计算，设置顶点位置时不包括margin位置，不然margin会不起作用，这是给View设置tag,在onlayout给子元素设置位置再遍历取出
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+ child.setTag(new Rect(rowsWidth - childWidth + marginParams.leftMargin, columnHeight + marginParams.topMargin, rowsWidth - marginParams.rightMargin, columnHeight + childHeight - marginParams.bottomMargin));
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+ }
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+
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+ //返回子元素总所占宽度和高度（用于计算Flowlayout的AT_MOST模式设置宽高）
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+ Map<String, Integer> flowMap = new HashMap<>();
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+ //单行
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+ if (aRow) {
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+ flowMap.put("allChildWidth", rowsWidth);
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+ } else {
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+ //多行
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+ flowMap.put("allChildWidth", flowWidth);
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+ }
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+ //FlowLayout测量高度 = 当前行顶部已占高度 +当前行内子元素最大高度+FlowLayout的PaddingBottom
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+ flowMap.put("allChildHeight", columnHeight + rowsMaxHeight + getPaddingBottom());
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+ return flowMap;
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+ }
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+}
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