实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
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); } }); } } }
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