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   源码介绍

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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);
				}
			});
		}
	}

}