Android Listview滑动时不加载数据 停止时加载数据

package com.zhengsonglan.listview_loading.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 com.nostra13.universalimageloader.core.ImageLoader;import com.zhengsonglan.listview_loading.R;import com.zhengsonglan.listview_loading.entity.UserEnity;import java.util.List;/** * */public class MyAdapter extends BaseAdapter { Context context; LayoutInflater inflater; List<UserEnity> lists; private boolean scrollState=false; public void setScrollState(boolean scrollState) {  this.scrollState = scrollState; } public MyAdapter(Context context, List<UserEnity> lists) {  this.context=context;  this.inflater=LayoutInflater.from(context);  this.lists=lists; } @Override public int getCount() {  return lists!=null?lists.size():0; } @Override public Object getItem(int position) {  return lists.get(position); } @Override public long getItemId(int position) {  return position; } @Override public View getView(int position, View convertView, ViewGroup parent) {  ViewHolder viewHolder;  if (convertView == null) {   convertView=inflater.inflate(R.layout.main_item,null,true);   viewHolder=new ViewHolder();   viewHolder.iv_icon= (ImageView) convertView.findViewById(R.id.main_item_iv_icon);   viewHolder.tv_name= (TextView) convertView.findViewById(R.id.main_item_tv_name);   convertView.setTag(viewHolder);  } else {   viewHolder= (ViewHolder) convertView.getTag();  }  UserEnity userEnity=lists.get(position);  String img_url=userEnity.getIcon();  if (!scrollState){   viewHolder.tv_name.setText(userEnity.getName());   viewHolder.tv_name.setTag(null);   ImageLoader.getInstance().displayImage(img_url,viewHolder.iv_icon);   viewHolder.iv_icon.setTag("1");  }else{   viewHolder.tv_name.setText("加载中");   viewHolder.tv_name.setTag(userEnity.getName());   viewHolder.iv_icon.setTag(img_url);   viewHolder.iv_icon.setImageResource(R.mipmap.ic_launcher);  }  return convertView; } static class ViewHolder{  TextView tv_name;  ImageView iv_icon; }}

//定义当前listview是否在滑动状态private boolean scrollState=false;public void setScrollState(boolean scrollState) { this.scrollState = scrollState;}

//实体类UserEnity userEnity=lists.get(position);if (!scrollState){//如果当前不是滑动的状态，我们填充真数据   //填充数据   viewHolder.tv_name.setText(userEnity.getName());   //设置Tag中数据为空表示数据已填充   viewHolder.tv_name.setTag(null);   //加载图片   ImageLoader.getInstance().displayImage(img_url,viewHolder.iv_icon);   //设置tag为1表示已加载过数据   viewHolder.iv_icon.setTag("1");}else{//如果当前是滑动的状态，我们填充假数据   viewHolder.tv_name.setText("加载中");   //将数据name保存在Tag当中   viewHolder.tv_name.setTag(userEnity.getName());   //将数据image_url保存在Tag当中   viewHolder.iv_icon.setTag(img_url);   //设置默认显示图片（最好是本地资源的图片）   viewHolder.iv_icon.setImageResource(R.mipmap.ic_launcher);}

@Override public void onScrollStateChanged(AbsListView view, int scrollState) {  switch (scrollState){   case AbsListView.OnScrollListener.SCROLL_STATE_IDLE://停止滚动   {    //设置为停止滚动    myAdapter.setScrollState(false);    //当前屏幕中listview的子项的个数    int count = view.getChildCount();    Log.e("MainActivity",count+"");    for (int i = 0; i < count; i++) {     //获取到item的name     TextView tv_name = (TextView) view.getChildAt(i).findViewById(R.id.main_item_tv_name);     //获取到item的头像     ImageView iv_show= (ImageView) view.getChildAt(i).findViewById(R.id.main_item_iv_icon);     if (tv_name.getTag() != null) { //非null说明需要加载数据      tv_name.setText(tv_name.getTag().toString());//直接从Tag中取出我们存储的数据name并且赋值      tv_name.setTag(null);//设置为已加载过数据     }     if (!iv_show.getTag().equals("1")){//!="1"说明需要加载数据      String image_url=iv_show.getTag().toString();//直接从Tag中取出我们存储的数据image――url      ImageLoader.getInstance().displayImage(image_url, iv_show);//显示图片      iv_show.setTag("1");//设置为已加载过数据     }    }    break;   }   case AbsListView.OnScrollListener.SCROLL_STATE_FLING://滚动做出了抛的动作   {    //设置为正在滚动    myAdapter.setScrollState(true);    break;   }   case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL://正在滚动   {    //设置为正在滚动    myAdapter.setScrollState(true);    break;   }  } }