Android+Listview+分页+动态加载网络数据

list_item.xml代码如下：

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:orientation="horizontal">

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical">
  <TextView
     android:id="@+id/Gds_Name"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:textSize="20px"
     />

  <TextView
     android:id="@+id/Gds_Code"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"/>
LinearLayout>
LinearLayout>

显示加载更多的布局代码loadmore.xml如下：

xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <Button
      android:id="@+id/loadMoreButton"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:text="查看更多..." />
LinearLayout>

商品类Goods.java的代码如下：

package com.jemsn.util;

public class Goods {
    private String Goods_ID;
    private String Gds_Code;
    private String Gds_Name;
    private String Gds_BarCode;
    private String Gds_Unit;
    private Double Gds_Ref;
    private String Gds_Price;
    private String Gds_PUnit;
    private String Gds_ClassID;
    private String Gds_GdsPY;

    public String getGoods_ID() {
        return Goods_ID;
    }

    public void setGoods_ID(String goods_ID) {
        Goods_ID = goods_ID;
    }

    public String getGds_Code() {
        return Gds_Code;
    }

    public void setGds_Code(String gds_Code) {
        Gds_Code = gds_Code;
    }

    public String getGds_Name() {
        return Gds_Name;
    }

    public void setGds_Name(String gds_Name) {
        Gds_Name = gds_Name;
    }

    public String getGds_BarCode() {
        return Gds_BarCode;
    }

    public void setGds_BarCode(String gds_BarCode) {
        Gds_BarCode = gds_BarCode;
    }

    public String getGds_Unit() {
        return Gds_Unit;
    }

    public void setGds_Unit(String gds_Unit) {
        Gds_Unit = gds_Unit;
    }

    public Double getGds_Ref() {
        return Gds_Ref;
    }

    public void setGds_Ref(Double gds_Ref) {
        Gds_Ref = gds_Ref;
    }

    public String getGds_Price() {
        return Gds_Price;
    }

    public void setGds_Price(String gds_Price) {
        Gds_Price = gds_Price;
    }

    public String getGds_PUnit() {
        return Gds_PUnit;
    }

    public void setGds_PUnit(String gds_PUnit) {
        Gds_PUnit = gds_PUnit;
    }

    public String getGds_ClassID() {
        return Gds_ClassID;
    }

    public void setGds_ClassID(String gds_ClassID) {
        Gds_ClassID = gds_ClassID;
    }

    public String getGds_GdsPY() {
        return Gds_GdsPY;
    }

    public void setGds_GdsPY(String gds_GdsPY) {
        Gds_GdsPY = gds_GdsPY;
    }

}

程序的主界面AndroidQueryActivity代码如下：

[java] view plain copy

package com.jemsn.android;


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

import org.json.JSONArray;

import com.jemsn.util.DialogUtil;
import com.jemsn.util.Goods;
import com.jemsn.util.WebServiceUtil;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidQueryActivity extends Activity implements OnScrollListener {

    private ListView list_View;
    private int visibleLastIndex = 0; // 最后的可视项索引
    private int visibleItemCount; // 当前窗口可见项总数
    private int datasize = 100; // 模拟数据集的条数
    private PaginationAdapter adapter;
    private View loadMoreView;
    private Button loadMoreButton,Search_Btn;
    private Handler handler = new Handler();
    private EditText SearcText;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.view_item);
        SearcText = (EditText) findViewById(R.id.text_SeGds);
        Search_Btn=(Button)findViewById(R.id.BtnGoods_Search);
        loadMoreView = getLayoutInflater().inflate(R.layout.loadmore, null);
        loadMoreButton = (Button) loadMoreView
                .findViewById(R.id.loadMoreButton);
        loadMoreButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                loadMoreButton.setText("正在加载中..."); // 设置按钮文字
                handler.postDelayed(new Runnable() {

                    @Override
                    public void run() {
                        loadMoreData();
                        adapter.notifyDataSetChanged();
                        Toast.makeText(AndroidQueryActivity.this, "数据加载完!", Toast.LENGTH_LONG).show();
                        loadMoreButton.setText("查看更多..."); // 恢复按钮文字
                    }
                }, 2000);

            }
        });
        Search_Btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                initializeAdapter();
                list_View.setAdapter(adapter);
            }
        });

        list_View = (ListView)findViewById(R.id.GoodsList);

        list_View.addFooterView(loadMoreView); // 设置列表底部视图
        Log.e("WangYOUHellow","Goods");
        initializeAdapter();

        list_View.setAdapter(adapter);
        Log.e("WangYOUHellow","Hellow");
        list_View.setOnScrollListener(this);
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        int itemsLastIndex = adapter.getCount() - 1; // 数据集最后一项的索引
        int lastIndex = itemsLastIndex + 1;
        if (scrollState == OnScrollListener.SCROLL_STATE_IDLE
                && visibleLastIndex == lastIndex) {
            // 如果是自动加载,可以在这里放置异步加载数据的代码
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        this.visibleItemCount = visibleItemCount;
        visibleLastIndex = firstVisibleItem + visibleItemCount - 1;

        // 如果所有的记录选项等于数据集的条数，则移除列表底部视图
        if (totalItemCount == datasize + 1) {
            //list_View.removeFooterView(loadMoreView);
            Toast.makeText(this, "数据全部加载完!", Toast.LENGTH_LONG).show();
        }
    }

    /**
     * 初始化ListView的适配器
     */
    private void initializeAdapter() {
        Log.e("WangYOUHellow","Bad");
        try {
            String Parame = SearcText.getText().toString();
            String ReturnStr = WebServiceUtil
                    .getCityListByProvince(Parame, "1");
            //DialogUtil.showDialog(this,ReturnStr, false);
            JSONArray jsonArray;
            // DialogUtil.showDialog(this, ReturnStr, false);
            if (ReturnStr.contentEquals("anyType{}")) {
                jsonArray = new JSONArray();
            } else {
                jsonArray = new JSONArray(ReturnStr);
            }
            // 向指定URL发送请求，并把服务器响应转换成JSONArray对象

            // 将JSONArray包装成Adapter
            List GoodsArry = new ArrayList();

            for (int i = 0; i
                Goods items = new Goods();
                items.setGds_Name(jsonArray.optJSONObject(i).getString(
                        "GdsName"));
                items.setGds_Code(jsonArray.optJSONObject(i).getString(
                        "GdsCode"));
                GoodsArry.add(items);
            }
            adapter = new PaginationAdapter(GoodsArry);
        } catch (Exception e) {
            //DialogUtil.showDialog(this, e.getMessage(), false);
            e.printStackTrace();
        }

    }

    /**
     * 加载更多数据
     */
    private void loadMoreData() {
        int count = adapter.getCount();

        try {

            String Parame = SearcText.getText().toString();
            String pageSize = String.valueOf(count / 10 + 1);
            String ReturnStr = WebServiceUtil.getCityListByProvince(Parame,
                    pageSize);
            JSONArray jsonArray;
            // DialogUtil.showDialog(this, ReturnStr, false);
            if (ReturnStr.contentEquals("anyType{}")) {
                jsonArray = new JSONArray();
            } else {
                jsonArray = new JSONArray(ReturnStr);
            }
            // 向指定URL发送请求，并把服务器响应转换成JSONArray对象

            // 将JSONArray包装成Adapter
            for (int i = 1; jsonArray.length() <= 10; i++) {
                Goods items = new Goods();
                items.setGds_Name(jsonArray.optJSONObject(i).getString(
                        "GdsName"));
                items.setGds_Code(jsonArray.optJSONObject(i).getString(
                        "GdsCode"));
                adapter.addNewsItem(items);
            }
        } catch (Exception e) {
            //DialogUtil.showDialog(this, e.getMessage(), false);
            e.printStackTrace();
        }

    }

    class PaginationAdapter extends BaseAdapter {

        List newsItems;

        public PaginationAdapter(List newsitems) {
            this.newsItems = newsitems;
        }

        @Override
        public int getCount() {
            return newsItems.size();
        }

        @Override
        public Object getItem(int position) {
            return newsItems.get(position);
        }

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

        @Override
        public View getView(int position, View view, ViewGroup parent) {
            if (view == null) {
                view = getLayoutInflater().inflate(R.layout.list_item, null);
            }

            // 商品名称
            TextView tvGdsName = (TextView) view.findViewById(R.id.Gds_Name);
            tvGdsName.setText(newsItems.get(position).getGds_Name());
            // 商品编码
            TextView tvGdsCode = (TextView) view.findViewById(R.id.Gds_Code);
            tvGdsCode.setText(newsItems.get(position).getGds_Code());

            return view;
        }

        /**
         * 添加数据列表项
         *
         * @param newsitem
         */
        public void addNewsItem(Goods newsitem) {
            newsItems.add(newsitem);
        }

    }

}