20.优化后的SimplerAdapyer，主要是实例对象，赋值分离，优化的更好

之前我们已经写过adapter该怎么使用，但是性能不够优化，这里我们将优化性能

首先还是编写adapter代码

package Adapter;

import android.content.Context;
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 java.util.List;

import Bean.HomeMsgBean;
import app.coolweather.com.weibo.R;

/**用于
 * Created by Administrator on 2016/9/4.
 *十八章的重点：将超链接转换成不是超链接的数据，并且解析，得到你想要的数据
 * holder.txt_wb_item_from.setMovementMethod(LinkMovementMethod.getInstance());       这句话表示能不能实现listview中控件的点击
 * holder.txt_wb_item_from.setText("来着:"+Html.fromHtml(s.getSource())); 

*/

public class HomeMsgAdapter extends BaseAdapter {

    private List<HomeMsgBean> list;      //list的作用是将数据放入Adapter中



    private LayoutInflater mInflater;   //将实例化对象的过程放在getView（）外面



    public HomeMsgAdapter(Context context,List<HomeMsgBean> list){

        this.list=list;
        mInflater = LayoutInflater.from(context);                     
 
//这里和上面一样，用于替换 这条语句view = LayoutInflater.from(context).inflate(R.layout.msg_write_layout, null);
    }    @Override    public int getCount() {        return list==null?0:list.size();    }    @Override    public Object getItem(int position) {        return list==null?null:list.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {//        View view = convertView;//        if(view==null){//            Holder holder=new Holder();//            view = LayoutInflater.from(context).inflate(R.layout.msg_write_layout, null);//加载布局文件，该布局文件为listview中的文件，返回v对象,即自己的模板文件//            //创建对象//            holder.user_content_textView= (TextView) view.findViewById(R.id.user_content);//            holder.user_head= (ImageView) view.findViewById(R.id.user_head);//            holder.commont_head=(ImageView)view.findViewById(R.id.user_head_one);//            holder.user_time=(TextView)view.findViewById(R.id.time_put);//            holder.commont_child=(TextView)view.findViewById(R.id.user_content_one);//            holder.commont_head_two=(ImageView)view.findViewById(R.id.user_head_two);//            //给各个对象赋值//            holder.user_content_textView.setText(list.get(position).getName());//            holder.user_head.setImageResource(list.get(position).getHead());    //setImageResource()中间填写R.drawable.picture//            holder.commont_head.setImageResource(list.get(position).getCommont());//            holder.user_time.setText(list.get(position).getContent());//            holder.commont_child.setText(list.get(position).getContent_child());//            holder.commont_head_two.setImageResource(list.get(position).getCommont_head());   //setImageResource()中间填写R.drawable.picture////        }        return createViewFromResource(position,convertView);        //将初始化复制分离    }    private View createViewFromResource(int position, View convertView)    {        View v;        if (convertView == null) {            v = mInflater.inflate(R.layout.msg_write_layout, null);             //这里填充的布局就是上面listview中的子布局        } else {            v = convertView;        }        bindView(position, v);        return v;    }     private  void bindView(int position,View view){                            //在这里实现初始化         Holder holder=new Holder();          holder.user_content_textView= (TextView) view.findViewById(R.id.user_content);         holder.user_head= (ImageView) view.findViewById(R.id.user_head);         holder.commont_head=(ImageView)view.findViewById(R.id.user_head_one);         holder.user_time=(TextView)view.findViewById(R.id.time_put);         holder.commont_child=(TextView)view.findViewById(R.id.user_content_one);         holder.commont_head_two=(ImageView)view.findViewById(R.id.user_head_two);         //给各个对象赋值         holder.user_content_textView.setText(list.get(position).getName());         holder.user_head.setImageResource(list.get(position).getHead());    //setImageResource()中间填写R.drawable.picture         holder.commont_head.setImageResource(list.get(position).getCommont());         holder.user_time.setText(list.get(position).getContent());         holder.commont_child.setText(list.get(position).getContent_child());         holder.commont_head_two.setImageResource(list.get(position).getCommont_head());   //setImageResource()中间填写R.drawable.picture     }    //静态类用于声明各个控件的对象，实现性能的优化    private static class Holder{        TextView user_content_textView;        ImageView user_head;        ImageView commont_head;        TextView user_time;        TextView commont_child;        ImageView commont_head_two;    }}

最后就是调用，还是一样的调用！！！！