Android ListView 根据滑动状态进行加载数据 滑动停止进行加载数据

package com.demo.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;    }}

Adapter 里面关键部分如下：

@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                //当前屏幕中listview的子项的个数                int count = view.getChildCount();//view.getChildAt                int firstVisiblePosition=view.getFirstVisiblePosition();//view.getItemIdAtPosition                int lastVisiblePosition=view.getLastVisiblePosition();//view.getItemIdAtPosition                MyLog.e("onScrollStateChanged","VideoOnScrollListener.onScrollStateChanged "                + "count = "+count                +";firstVisiblePosition = "+firstVisiblePosition                +";lastVisiblePosition = "+lastVisiblePosition);                                for (int i = 0; i < count; i++) {//                for (int i = firstVisiblePosition; i < lastVisiblePosition; 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;            }        }    }

还有这个

listview.setOnScrollListener(this);