Android 利用ViewPager+GridView，仿美团首页导航栏分类布局界面

完整GridViewAdapter代码如下：

package com.example.meituanheaderdemo.adapter;

import android.content.Context;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

import com.example.meituanheaderdemo.R;

import com.example.meituanheaderdemo.bean.HeaderViewBean;

import java.util.List;

/**

* Created by zhangxutong on 2016/2/16. */

public class GridViewAdapter extends BaseAdapter {

private List mDatas;

private LayoutInflater mLayoutInflater;

/**

* 页数下标,从0开始 */ private int mIndex;

/**

* 每页显示最大条目个数 ,默认是dimes.xml里 HomePageHeaderColumn 属性值的两倍 */ private int mPageSize;

public GridViewAdapter(Context context, List mDatas, int mIndex) {

this.mDatas = mDatas;

mLayoutInflater = LayoutInflater.from(context);

this.mIndex = mIndex;

mPageSize = context.getResources().getInteger(R.integer.HomePageHeaderColumn) * 2;

}

/**

* 先判断数据集的大小是否足够显示满本页？mDatas.size() > (mIndex+1)*mPageSize, * 如果够，则直接返回每一页显示的最大条目个数mPageSize, * 如果不够，则有几项返回几,(mDatas.size() - mIndex * mPageSize); */ @Override

public int getCount() {

return mDatas.size() > (mIndex + 1) * mPageSize ? mPageSize : (mDatas.size() - mIndex * mPageSize);

}

@Override

public Object getItem(int position) {

return mDatas.get(position + mIndex * mPageSize);

}

@Override

public long getItemId(int position) {

return position + mIndex * mPageSize;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

Log.i(“TAG”, “position:” + position);

ViewHolder vh = null;

if (convertView == null) {

convertView = mLayoutInflater.inflate(R.layout.item_gridview_header, parent, false);

vh = new ViewHolder();

vh.tv = (TextView) convertView.findViewById(R.id.textView);

vh.iv = (ImageView) convertView.findViewById(R.id.imageView);

convertView.setTag(vh);

} else {

vh = (ViewHolder) convertView.getTag();

}

/**

* 在给View绑定显示的数据时，计算正确的position = posi