Andorid 流式布局 热门标签解决方案
jopen
9年前
// 流式布局 话不多说，比较简单，注释都写的很清楚 import java.util.ArrayList; import java.util.List; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; /** * * @author Mr.Himan * @version 1.0<br> * 2015年11月4日 11:12:06 <br> * 流式布局 设置MarginTop 和MarginLeft有效 MarginRight 暂未实现 */ public class FlowLayout extends ViewGroup { /** * 存储所有的子View */ private List<List<View>> mAllChildViews = new ArrayList<List<View>>(); /** * 存储每一行的高度 */ private List<Integer> mLineHeight = new ArrayList<Integer>(); public FlowLayout(Context context) { this(context, null); } public FlowLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public FlowLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mAllChildViews.clear(); mLineHeight.clear(); // 获取当前ViewGroup的宽度 int width = getWidth(); int lineWidth = 0; int lineHeight = 0; // 记录当前行的view List<View> lineViews = new ArrayList<View>(); int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { View child = getChildAt(i); MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); int childWidth = child.getMeasuredWidth(); int childHeight = child.getMeasuredHeight(); // 如果需要换行 if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width) { // 记录LineHeight mLineHeight.add(lineHeight); // 记录当前行的Views mAllChildViews.add(lineViews); // 重置行的宽高 lineWidth = 0; lineHeight = childHeight + lp.topMargin + lp.bottomMargin; // 重置view的集合 lineViews = new ArrayList(); } lineWidth += childWidth + lp.leftMargin + lp.rightMargin; lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin); lineViews.add(child); } // 处理最后一行 mLineHeight.add(lineHeight); mAllChildViews.add(lineViews); MarginLayoutParams params = (MarginLayoutParams) this.getLayoutParams(); // 设置子View的位置 int left = 0; // 添加marginTop int top = 0 + params.topMargin; // 获取行数 int lineCount = mAllChildViews.size(); for (int i = 0; i < lineCount; i++) { // 当前行的views和高度 lineViews = mAllChildViews.get(i); lineHeight = mLineHeight.get(i); for (int j = 0; j < lineViews.size(); j++) { // 为每一列设置marginLeft if (j == 0) { left = 0 + params.leftMargin; } View child = lineViews.get(j); // 判断是否显示 if (child.getVisibility() == View.GONE) { continue; } MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); int cLeft = left + lp.leftMargin; int cTop = top + lp.topMargin; int cRight = cLeft + child.getMeasuredWidth(); int cBottom = cTop + child.getMeasuredHeight(); // 进行子View进行布局 child.layout(cLeft, cTop, cRight, cBottom); left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; } left = 0; top += lineHeight; } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // 父控件传进来的宽度和高度以及对应的测量模式 int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); int modeHeight = MeasureSpec.getMode(heightMeasureSpec); // 如果当前ViewGroup的宽高为wrap_content的情况 int width = 0;// 自己测量的 宽度 int height = 0;// 自己测量的高度 // 记录每一行的宽度和高度 int lineWidth = 0; int lineHeight = 0; // 获取子view的个数 int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { View child = getChildAt(i); // 测量子View的宽和高 measureChild(child, widthMeasureSpec, heightMeasureSpec); // 得到LayoutParams MarginLayoutParams params = (MarginLayoutParams) child .getLayoutParams(); // 子View占据的宽度 int childWidth = child.getMeasuredWidth() + params.leftMargin + params.rightMargin; // 子View占据的高度 int childHeight = child.getMeasuredHeight() + params.bottomMargin + params.topMargin; // 换行时候 if (lineWidth + childWidth > sizeWidth) { // 对比得到最大的宽度 width = Math.max(width, lineWidth); // 重置lineWidth lineWidth = childWidth; // 记录行高 height += lineHeight; lineHeight = childHeight; } else { // 不换行情况 // 叠加行宽 lineWidth += childWidth; // 得到最大行高 lineHeight = Math.max(lineHeight, childHeight); } // 处理最后一个子View的情况 if (i == childCount - 1) { width = Math.max(width, lineWidth); height += lineHeight; } } setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width, modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height); } /** * 与当前ViewGroup对应的LayoutParams */ @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { return new MarginLayoutParams(getContext(), attrs); } }