SuperBaseAdapter以及BaseHolder的抽取封装

在一个项目中，用到ListView的地方可能会很多，如果每一次都创建一次Adapter，再来一个ViewHolder就太伤感情了，特别是一个listView还带有加载更多的一个item，那么每一次都需要去实现。

所以对SuperBaseAdapter以及BaseHolder的抽取封装就十分有必要了：

对BaseHolder进行封装：

import android.view.View;

/**
 * 作者：Created by Kevin on 2016/1/30.
 * 邮箱：haowei0708@163.com
 * 描述：ViewHolder的基类
 */
public abstract class BaseHolder<HODLERBEANTYPE> {

    public View mHolderView;
    private HODLERBEANTYPE mData;
    public BaseHolder() {
        //初始化根布局
        mHolderView = initHolderView();
        //绑定tag
        mHolderView.setTag(this);
    }

    //初始化ViewHolder的视图
    public abstract View initHolderView();

    /**
     * @des 设置数据刷新视图
     * @call 需要设置数据和刷新数据的时候调用
     */
    public void setDataAndRefreshHolderView(HODLERBEANTYPE data) {
        // 保存数据
        mData = data;
        // 刷新显示
        refreshHolderView(data);
    }

    /**
     * @des 刷新holder视图
     * @call setDataAndRefreshHolderView()方法被调用的时候就被调用了吧
     */
    public abstract void refreshHolderView(HODLERBEANTYPE data);
}

再对BaseAdapter进行抽取：

import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;

import java.util.ArrayList;
import java.util.List;

/**
 * 作者：Created by Kevin on 2016/1/30.
 * 邮箱：haowei0708@163.com
 * 描述：超级BaseAdapter
 */
public abstract class SuperBaseAdapter<BEANTYPE> extends BaseAdapter{

    public List<BEANTYPE> mDataSource = new ArrayList<BEANTYPE>();
    public static final int     VIEWTYPE_LOADMORE   = 0;
    public static final int     VIEWTYPE_NORMAL     = 1;

    public SuperBaseAdapter(AbsListView absListView, List<BEANTYPE> dataSource) {
        super();
        mDataSource = dataSource;
    }
    @Override
    public int getCount() {
        if (mDataSource != null){
            return mDataSource.size();
        }
        return 0;
    }

    @Override
    public Object getItem(int position) {
        if (mDataSource != null){
            return mDataSource.get(position);
        }
        return null;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        BaseHolder holder = null;
        if (convertView == null){
            holder = getSpecialHolder();
        }else {
            holder = (BaseHolder) convertView.getTag();
        }

        //数据展示
        holder.setDataAndRefreshHolderView(mDataSource.get(position));
        return holder.mHolderView;
    }

    /**listView中可以显示的View类型*/
    @Override
    public int getItemViewType(int position) {
        if (position == getCount() -1){//表示滑到底部：加载更多
            return VIEWTYPE_LOADMORE;
        }
        return VIEWTYPE_NORMAL;
    }

    @Override
    public int getViewTypeCount() {
        return super.getViewTypeCount() + 1;
    }

    /**获取到各页面相应的Holder，由子类自己实现*/
    public abstract BaseHolder getSpecialHolder();
}

然后构造相应的Holder继承baseHolder即可，这里是主页的Adapter：HomeAdapter

import android.view.View;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.TextView;

import com.example.administrator.googleplay.R;
import com.example.administrator.googleplay.base.BaseHolder;
import com.example.administrator.googleplay.bean.HomeBean;
import com.example.administrator.googleplay.global.Constants;
import com.example.administrator.googleplay.utils.BitmapHelper;
import com.example.administrator.googleplay.utils.StringUtils;
import com.example.administrator.googleplay.utils.UIUtils;
import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.ViewUtils;
import com.lidroid.xutils.view.annotation.ViewInject;

/**
 * 作者：Created by Kevin on 2016/1/30.
 * 邮箱：haowei0708@163.com
 * 描述：主页的Holder
 */
public class HomeHolder extends BaseHolder<HomeBean.AppInfos>{

    @ViewInject(R.id.item_appinfo_tv_title)
    TextView tvTitle; //app标题

    @ViewInject(R.id.item_appinfo_tv_size)
    TextView tvSize;  //app的大小

    @ViewInject(R.id.item_appinfo_tv_des)
    TextView tvDesc;  //app的描述

    @ViewInject(R.id.item_appinfo_rb_stars)
    RatingBar rbStars; //星级

    @ViewInject(R.id.item_appinfo_iv_icon)
    ImageView ivAppIcon; //app的图标

    @ViewInject(R.id.iv_download)
    ImageView ivDownload; //下载的图标


    @Override
    public View initHolderView() {
        View homeView = View.inflate(UIUtils.getContext(), R.layout.item_app_info, null);
        //注入
        ViewUtils.inject(this,homeView);
        return homeView;
    }


    @Override
    public void refreshHolderView(HomeBean.AppInfos data) {
        tvTitle.setText(data.name);


        tvSize.setText(StringUtils.formatFileSize(data.size));
        tvDesc.setText(data.des);

        rbStars.setRating(data.stars);

        BitmapHelper.display(ivAppIcon, Constants.URLS.APPICON + data.iconUrl);
    }
}

最后在listView的地方调用

HomeAdapter adapter = new HomeAdapter(listView,appInfoses);

        listView.setAdapter(adapter);
private class HomeAdapter extends SuperBaseAdapter<HomeBean.AppInfos>{

        public HomeAdapter(AbsListView absListView, List<HomeBean.AppInfos> dataSource) {
            super(absListView,dataSource);
        }

        @Override
        public BaseHolder<HomeBean.AppInfos> getSpecialHolder() {
            return new HomeHolder();
        }
    }

这就是最基本的BaseAdapter的抽取，很多场景可以直接使用。当然如果有加载更多的功能的时候，需要使用更强力的BaseAdapter，下一篇来实现它。