listView实现分页加载

本是古典何须时尚 2022-08-21 00:04 257阅读 0赞

实现简单的listview分页加载，效果如下图所示：  
![这里写图片描述][20160306020113348]  
ListView显示预加载的10个Item，往上拉动每次加载2个Item；  
自定义类LoadListView继承ListView，实现OnScrollListener接口，重写它的两个方法，在类里面定义一个加载更多数据的回调接口；

public class LoadListView extends ListView implements OnScrollListener { 
        View footer;         //底部布局；
        int lastVisibleItem; //最后一个可见的item；
        int totalItemCount;  //总的数量；
        boolean isLoading;   //正在加载；
        ILoadListener iLoadListener;
    
        public LoadListView(Context context) 
        {
            super(context);
            initShow(context);
        }
    
        public LoadListView(Context context, AttributeSet attrs) 
        {
            super(context, attrs);
            initShow(context);
        }
    
        //加载底部布局；
        private void initShow(Context context)
        {
            LayoutInflater inflater = LayoutInflater.from(context);
            footer = inflater.inflate(R.layout.footer_layout, null);
            footer.findViewById(R.id.layout).setVisibility(View.GONE);
            this.addFooterView(footer);
            this.setOnScrollListener(this);
        }
    
        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) 
        {
            if(totalItemCount == lastVisibleItem && scrollState == SCROLL_STATE_IDLE) //滚动状态；
            {
                if(!isLoading)
                {
                    isLoading = true;                        
                    footer.findViewById(R.id.layout).
                       setVisibility(View.VISIBLE);
                    iLoadListener.onload();  //加载更多数据；
                }           
            }
        }
    
        @Override
        public void onScroll(AbsListView view, int firstVisibleItem,
                int visibleItemCount, int totalItemCount) 
        {
            this.lastVisibleItem = firstVisibleItem + visibleItemCount;
            this.totalItemCount = totalItemCount;
        }
    
        public void setLoadListener(ILoadListener iLoadListener)
        {
            this.iLoadListener = iLoadListener;
        }
    
        //加载完成；
        public void setComplete()
        {
            isLoading = false;
            footer.findViewById(R.id.layout).
                setVisibility(View.GONE);
        }   
    
        //加载更多数据的回调接口；
        public interface ILoadListener { 
            public void onload();
        }
    }

footer\_layout布局文件：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" >
    
        <LinearLayout android:id="@+id/layout" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:paddingTop="10dp" android:paddingBottom="10dp" android:gravity="center" >
            <ProgressBar style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" />
            <TextView android:text="正在加载……" android:layout_width="wrap_content" android:layout_height="wrap_content" />
    
        </LinearLayout>
    </LinearLayout>

MainActivity中实现LoadListView中的ILoadListener接口：

public class MainActivity extends Activity implements ILoadListener { 
        MyAdapterTel myAdapter;
        LoadListView listView;
        List<TelContent> list = new ArrayList<TelContent>();          //店铺集合；
    
        @Override
        protected void onCreate(Bundle savedInstanceState) 
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            getData();           //预加载的数据；
            showListView(list);  //显示预加载的数据；
        }
    
        private void showListView(List<TelContent> list)
        {
            if(myAdapter == null)
            {
                listView = (LoadListView)findViewById(R.id.filemgr_all_listView);
                listView.setLoadListener(this);  //设置接口监听；
                myAdapter = new MyAdapterTel(this, list);
                listView.setAdapter(myAdapter);
            }
            else
            {
                myAdapter.onDateChange(list);
            }
        }
    
        //预加载的数据；
        private void getData()
        {
            for(int i=0; i<10; i++)
            {
                TelContent telContent = new TelContent();
                telContent.setId(i);
                telContent.setShop("aaa" + i);
                telContent.setTel("7777" + i);
                list.add(telContent);
                list.get(i).toString();
            }
        }
    
        //每次加载的数据；
        private void getLoadData()
        {
            for(int i=0; i<2; i++)
            {
                TelContent telContent = new TelContent();
                telContent.setId(i);
                telContent.setShop("aaa" + i);
                telContent.setTel("7777" + i);
                list.add(telContent);
            }
        }
    
        @Override
        public void onload() 
        {
            Handler handler = new Handler();
            handler.postDelayed(new Runnable() //方便显示加载数据的效果，延时2000mm执行；
            {       
                @Override
                public void run() 
                {               
                    getLoadData();       //加载数据； 
                    showListView(list);  //更新listView界面； 
                    listView.setComplete();//隐藏footer；
                }
            }, 2000); 
        }
    }

TelContent封装类：

package com.lu.list;
    
    public class TelContent { 
        private String shop;  //店铺名；
        private String tel;   //店铺电话； 
        private Integer id;   //通讯种类；
    
        public String getShop() {
            return shop;
        }
        public void setShop(String shop) {
            this.shop = shop;
        }
        public String getTel() {
            return tel;
        }
        public void setTel(String tel) {
            this.tel = tel;
        }
        public Integer getId() {
            return id;
        }
        public void setId(Integer id) {
            this.id = id;
        } 
        @Override
        public String toString() 
        {
            return "id=" + id + ", shop=" + shop + ", tel=" + tel;
        }
    }

Adapter适配器：

package com.lu.list;
    
    import java.util.List;
    
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.TextView;
    
    public class MyAdapterTel extends BaseAdapter { 
        TextView telmgr_tel_tv;       //电话；
        TextView telmgr_title_tv;     //店铺；
        List<TelContent> list;        //店铺集合；
        LayoutInflater inflater;
    
        public MyAdapterTel(Context context, List<TelContent> listTel)
        {
            inflater = LayoutInflater.from(context);
            this.list = listTel;
        }
    
        //数据刷新；
        public void onDateChange(List<TelContent> listTel)
        {
            this.list = listTel;
            this.notifyDataSetChanged();
        }
    
        @Override
        public int getCount() 
        {
            return list.size();
        }
    
        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return null;
        }
    
        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) 
        {
            convertView = inflater.inflate(R.layout.items_layout, null);
            telmgr_title_tv = (TextView)convertView.findViewById(R.id.telmgr_title_tv);
            telmgr_tel_tv = (TextView)convertView.findViewById(R.id.telmgr_tel_tv);
            telmgr_title_tv.setText(list.get(position).getShop());
            telmgr_tel_tv.setText(list.get(position).getTel());
            return convertView;
        }
    }

items\_layout列表布局：

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" >
    
        <TextView android:id="@+id/telmgr_title_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="17sp" android:padding="9dp" android:layout_alignParentLeft="true" />
    
        <TextView android:id="@+id/telmgr_tel_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:textSize="17sp" android:padding="9dp" />
    
    </RelativeLayout>

listView分页下载的源码[http://download.csdn.net/detail/baidu\_32731497/9453685][http_download.csdn.net_detail_baidu_32731497_9453685]

[20160306020113348]: /images/20220731/45c162ea7afc4b8c961a70dba85799e9.png
[http_download.csdn.net_detail_baidu_32731497_9453685]: http://download.csdn.net/detail/baidu_32731497/9453685