android自定义viewgroup实现等分格子布局
先上效果图：
实现这样的效果：
一般的思路就是，直接写布局文件，用LinearLayout 嵌套多层子LinearLayout,然后根据权重layout_weight可以达到上面的效果
还有就是利用gridview了，但是这里的需求就是不能上下滑动，使用gridview的时候还要计算布局的高度，否则内容超出下滑；
开始我是用的第一种，直接在布局文件实现了，但是后来发现代码太多太恶心哦，所以我继承viewGroup,重写两个关键的方法：onLayout(),onMeasure()
我的大致思路：
1.计算当前视图宽度和高度，然后根据边距，算出每个布局的item需要分配的多少宽度和高度：
2.支持adapter的方式，动态添加每一项，还可以设置每一项点击事件
好了，直接上关键代码：
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub mMaxChildWidth = 0; mMaxChildHeight = 0; int modeW = 0, modeH = 0; if (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED) modeW = MeasureSpec.UNSPECIFIED; if (MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.UNSPECIFIED) modeH = MeasureSpec.UNSPECIFIED; final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( MeasureSpec.getSize(widthMeasureSpec), modeW); final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( MeasureSpec.getSize(heightMeasureSpec), modeH); count = getChildCount(); if (count == 0) { super.onMeasure(childWidthMeasureSpec, childHeightMeasureSpec); return; } for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.getVisibility() == GONE) { continue; } child.measure(childWidthMeasureSpec, childHeightMeasureSpec); mMaxChildWidth = Math.max(mMaxChildWidth, child.getMeasuredWidth()); mMaxChildHeight = Math.max(mMaxChildHeight, child.getMeasuredHeight()); } setMeasuredDimension(resolveSize(mMaxChildWidth, widthMeasureSpec), resolveSize(mMaxChildHeight, heightMeasureSpec)); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { // TODO Auto-generated method stub int height = b - t;// 布局区域高度 int width = r - l;// 布局区域宽度 int rows = count % colums == 0 ? count / colums : count / colums + 1;// 行数 if (count == 0) return; int gridW = (width - margin * (colums - 1)) / colums;// 格子宽度 int gridH = (height - margin * rows) / rows;// 格子高度 int left = 0; int top = margin; for (int i = 0; i < rows; i++) {// 遍历行 for (int j = 0; j < colums; j++) {// 遍历每一行的元素 View child = this.getChildAt(i * colums + j); if (child == null) return; left = j * gridW + j * margin; // 如果当前布局宽度和测量宽度不一样，就直接用当前布局的宽度重新测量 if (gridW != child.getMeasuredWidth() || gridH != child.getMeasuredHeight()) { child.measure(makeMeasureSpec(gridW, EXACTLY), makeMeasureSpec(gridH, EXACTLY)); } child.layout(left, top, left + gridW, top + gridH); // System.out // .println("--top--" + top + ",bottom=" + (top + gridH)); } top += gridH + margin; } }
要实现adapter也很简单，自定义一个接口,下面给出完整的代码
package com.allen.view; import static android.view.View.MeasureSpec.EXACTLY; import static android.view.View.MeasureSpec.makeMeasureSpec; import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import com.allen.mygridlayout.R; /** * @author allen * @email jaylong1302@163.com * @date 2013-11-26 下午1:19:35 * @company 富媒科技 * @version 1.0 * @description 格子布局(类似4.0中的gridlayout) */ public class MyGridLayout extends ViewGroup { private final String TAG = "MyGridLayout"; int margin = 2;// 每个格子的水平和垂直间隔 int colums = 2; private int mMaxChildWidth = 0; private int mMaxChildHeight = 0; int count = 0; GridAdatper adapter; public MyGridLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); if (attrs != null) { TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.MyGridLayout); colums = a.getInteger(R.styleable.MyGridLayout_numColumns, 2); margin = (int) a.getInteger(R.styleable.MyGridLayout_itemMargin, 2); } } public MyGridLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyGridLayout(Context context) { this(context, null); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub mMaxChildWidth = 0; mMaxChildHeight = 0; int modeW = 0, modeH = 0; if (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED) modeW = MeasureSpec.UNSPECIFIED; if (MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.UNSPECIFIED) modeH = MeasureSpec.UNSPECIFIED; final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( MeasureSpec.getSize(widthMeasureSpec), modeW); final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( MeasureSpec.getSize(heightMeasureSpec), modeH); count = getChildCount(); if (count == 0) { super.onMeasure(childWidthMeasureSpec, childHeightMeasureSpec); return; } for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.getVisibility() == GONE) { continue; } child.measure(childWidthMeasureSpec, childHeightMeasureSpec); mMaxChildWidth = Math.max(mMaxChildWidth, child.getMeasuredWidth()); mMaxChildHeight = Math.max(mMaxChildHeight, child.getMeasuredHeight()); } setMeasuredDimension(resolveSize(mMaxChildWidth, widthMeasureSpec), resolveSize(mMaxChildHeight, heightMeasureSpec)); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { // TODO Auto-generated method stub int height = b - t;// 布局区域高度 int width = r - l;// 布局区域宽度 int rows = count % colums == 0 ? count / colums : count / colums + 1;// 行数 if (count == 0) return; int gridW = (width - margin * (colums - 1)) / colums;// 格子宽度 int gridH = (height - margin * rows) / rows;// 格子高度 int left = 0; int top = margin; for (int i = 0; i < rows; i++) {// 遍历行 for (int j = 0; j < colums; j++) {// 遍历每一行的元素 View child = this.getChildAt(i * colums + j); if (child == null) return; left = j * gridW + j * margin; // 如果当前布局宽度和测量宽度不一样，就直接用当前布局的宽度重新测量 if (gridW != child.getMeasuredWidth() || gridH != child.getMeasuredHeight()) { child.measure(makeMeasureSpec(gridW, EXACTLY), makeMeasureSpec(gridH, EXACTLY)); } child.layout(left, top, left + gridW, top + gridH); // System.out // .println("--top--" + top + ",bottom=" + (top + gridH)); } top += gridH + margin; } } public interface GridAdatper { View getView(int index); int getCount(); } /** 设置适配器 */ public void setGridAdapter(GridAdatper adapter) { this.adapter = adapter; // 动态添加视图 int size = adapter.getCount(); for (int i = 0; i < size; i++) { addView(adapter.getView(i)); } } public interface OnItemClickListener { void onItemClick(View v, int index); } public void setOnItemClickListener(final OnItemClickListener click) { if (this.adapter == null) return; for (int i = 0; i < adapter.getCount(); i++) { final int index = i; View view = getChildAt(i); view.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub click.onItemClick(v, index); } }); } } }
这里我给出完整的demo下载：click me!!!
