ListView与Adapter简单试用

0x00 概述

在android项目中,有很多时候要用到列表,这时listview和adapter 就能满足你的需求,基本的

  1. 创建总布局文件
  2. 创建listview_item即每一行要显示的布局文件
  3. 创建adapter类
  4. 创建activity类将数据放进adapter中

这里是完成后的效果图

image

0x01 创建总布局文件 activity_jiansuo.xml

<?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" >

<EditText
    android:id="@+id/et_jiansuo"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="搜索内容" />

<Button
    android:id="@+id/bt_jiansuo"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="搜索" />

<ListView
    android:id="@+id/lv_jiansuo"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

</LinearLayout>

0x02 创建listview_item即每一行要显示的布局文件 activity_jiansuo_item.xml

<?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" >

<TextView
    android:id="@+id/tv_m_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tv_call_no"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tv_guanchang"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tv_kejie"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tv_m_author"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tv_m_publisher"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tv_m_year"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</LinearLayout>

0x03 创建adapter类

import gabriel.luoyer.promonkey.R;
import gabriel.luoyer.promonkey.bean.LIB.LIB_book;

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 JianSuo_Adapter extends BaseAdapter {

private Context context; // 运行上下文
private List<LIB_book> listItems; // 商品信息集合
private LayoutInflater listContainer; // 视图容器

public final class ListItemView {
    public TextView tv_m_title;
    public TextView tv_call_no;
    public TextView tv_guanchang;
    public TextView tv_kejie;
    public TextView tv_m_author;
    public TextView tv_m_publisher;
    public TextView tv_m_year;
}

public JianSuo_Adapter(Context context, List<LIB_book> listItems) {
    this.context = context;
    this.listItems = listItems;
    listContainer = LayoutInflater.from(context); // 创建视图容器并设置上下文
}

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

@Override
public LIB_book getItem(int position) {
    return listItems.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ListItemView listItemView = null;
    if (convertView == null) {
        listItemView = new ListItemView();
        convertView = listContainer.inflate(R.layout.activity_jiansuo_item, null);
        listItemView.tv_m_title=(TextView)convertView.findViewById(R.id.tv_m_title);
        listItemView.tv_call_no=(TextView)convertView.findViewById(R.id.tv_call_no);
        listItemView.tv_guanchang=(TextView)convertView.findViewById(R.id.tv_guanchang);
        listItemView.tv_kejie=(TextView)convertView.findViewById(R.id.tv_kejie);
        listItemView.tv_m_author=(TextView)convertView.findViewById(R.id.tv_m_author);
        listItemView.tv_m_publisher=(TextView)convertView.findViewById(R.id.tv_m_publisher);
        listItemView.tv_m_year=(TextView)convertView.findViewById(R.id.tv_m_year);
        //设置控件集到convertView  
        convertView.setTag(listItemView);
    }else{
          listItemView = (ListItemView)convertView.getTag();  
    }
    listItemView.tv_m_title.setText(listItems.get(position).getM_TITLE());
    listItemView.tv_call_no.setText(listItems.get(position).getCALL_NO());
    listItemView.tv_guanchang.setText(listItems.get(position).getGuanChang());
    listItemView.tv_kejie.setText(listItems.get(position).getKeJie());
    listItemView.tv_m_author.setText(listItems.get(position).getM_AUTHOR());
    listItemView.tv_m_publisher.setText(listItems.get(position)
            .getM_PUBLISHER());
    listItemView.tv_m_year.setText(listItems.get(position).getM_PUB_YEAR());

    return convertView;
}

}

0x04 创建activity类将数据放进adapter中

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONObject;


import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import gabriel.luoyer.promonkey.R;
import gabriel.luoyer.promonkey.adapter.JianSuo_Adapter;
import gabriel.luoyer.promonkey.base.BaseActivity;
import gabriel.luoyer.promonkey.bean.LIB.LIB_book;
import gabriel.luoyer.promonkey.bean.LIB.util.HttpClient_Bean_K;
import gabriel.luoyer.promonkey.utils.HttpClient_Util_K;
import gabriel.luoyer.promonkey.utils.NumericCharacterReference;

public class JianSuo_activity extends BaseActivity {

private ListView listView;
private EditText et_jiansuo;
private Button bt_jiansuo;
private JianSuo_Adapter jiansuo_adapter;
public LayoutInflater mInflater;
public JSONObject json;
private HttpClient_Bean_K hcbk_lend_lst;
private List<String> ls_lst_two_params = new ArrayList<String>();
private JianSuo_Adapter jianSuo_Adapter;
private List<LIB_book> llb;
private HttpClient_Bean_K hcbk_bl_jiansuo;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_jiansuo);

    initViews();
    initEvents();
}

@Override
protected void initViews() {
    listView = (ListView) this.findViewById(R.id.lv_jiansuo);
    et_jiansuo = (EditText) this.findViewById(R.id.et_jiansuo);
    bt_jiansuo = (Button) this.findViewById(R.id.bt_jiansuo);
}

@Override
protected void initEvents() {
    bt_jiansuo.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            if(!et_jiansuo.getText().toString().isEmpty()){
                Thread jianSuo_Book_thread = new Thread(new JianSuo_Book_thread());
                jianSuo_Book_thread.start();
            }

        }

    });

}

class JianSuo_Book_thread implements Runnable {

    @Override
    public void run() {

        /*
         * 先写成 每次访问都要登陆 因为第一次访问为未登陆 不知道为何返回码不为302 而是200 //访问lst //Header []
         * header_android ={new
         * Header("Set-Cookie",sharedata.getString("Set-Cookie", null))};
         * hcbk_lend_lst = HttpClient_Util_K .http_Client_Get_Web(
         * "http://121.193.129.2:8080/reader/book_lst.php", null, null,
         * null);
         * System.out.println("hcbk_lend_lst 第一次发送未还书籍记录 返回码为 :  "+hcbk_lend_lst
         * .getStatusCode() );
         */

        String jiansuo = "";
        try {
            jiansuo = URLEncoder.encode(et_jiansuo.getText()+"", "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        // 获取检索书籍
        org.apache.commons.httpclient.NameValuePair[] data_jiansuo = {
                new org.apache.commons.httpclient.NameValuePair(
                        "strSearchType", "title"),
                new org.apache.commons.httpclient.NameValuePair(
                        "match_flag", "any"),
                new org.apache.commons.httpclient.NameValuePair(
                        "historyCount", "1"),
                new org.apache.commons.httpclient.NameValuePair("strText",
                        jiansuo),
                new org.apache.commons.httpclient.NameValuePair("doctype",
                        "ALL"),
                new org.apache.commons.httpclient.NameValuePair(
                        "with_ebook", "on"),
                new org.apache.commons.httpclient.NameValuePair(
                        "displaypg", "20"),
                new org.apache.commons.httpclient.NameValuePair("showmode",
                        "list"),
                new org.apache.commons.httpclient.NameValuePair("sort",
                        "CATA_DATE"),
                new org.apache.commons.httpclient.NameValuePair("orderby",
                        "desc"),
                new org.apache.commons.httpclient.NameValuePair("location",
                        "ALL") };
         hcbk_bl_jiansuo = HttpClient_Util_K
                .http_Client_Get_Web(
                        "http://121.193.129.2:8080/opac/openlink.php",
                        data_jiansuo, null, null);

        Message msg = queryMaxhandler.obtainMessage();
        msg.what = 0;
        queryMaxhandler.sendMessage(msg);
    }

}

// Handler
Handler queryMaxhandler = new Handler() {
    public void handleMessage(Message msg) {
        switch (msg.what) {
        case 0:
            llb =new ArrayList<LIB_book>();
            int fromIndex = hcbk_bl_jiansuo.getWebContent().indexOf("<h3>");
            int num = 0;
            while (fromIndex != -1) {
                LIB_book lb_item = new LIB_book();
                num++;
                // 获取m_title 开始以&#X 结束以</a>
                int m_title_start = hcbk_bl_jiansuo.getWebContent().indexOf("&#x",
                        fromIndex);
                int m_title_end = hcbk_bl_jiansuo.getWebContent().indexOf("</a>",
                        m_title_start);
                String m_title = hcbk_bl_jiansuo.getWebContent().substring(
                        m_title_start, m_title_end);
                System.out.print(num + ":"
                        + NumericCharacterReference.decode(m_title, '!'));

                lb_item.setM_TITLE(NumericCharacterReference.decode(m_title, '!'));
                // 获取索引号 
                int m_call_no_end =hcbk_bl_jiansuo.getWebContent().indexOf("</h3>", m_title_end);
                //+5为了去掉</a>
                System.out.print("  索引号 :"+NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(m_title_end+5, m_call_no_end).trim(),'!'));
                lb_item.setCALL_NO(NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(m_title_end+5, m_call_no_end).trim(),'!'));
                //获取馆藏副本 +5为了去掉馆藏副本 :
                int guanchang_start =hcbk_bl_jiansuo.getWebContent().indexOf("馆藏复本：",m_call_no_end);
                int guanchang_end =hcbk_bl_jiansuo.getWebContent().indexOf("<br>",guanchang_start);
                System.out.print("   馆藏副本 :"+NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(guanchang_start+5,guanchang_end).trim(), '!'));
                lb_item.setGuanChang(Integer.parseInt(NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(guanchang_start+5,guanchang_end).trim(), '!')));
                //获取可借副本
                int kejie_start =hcbk_bl_jiansuo.getWebContent().indexOf("可借复本：",guanchang_end);
                int kejie_end =hcbk_bl_jiansuo.getWebContent().indexOf("</span>",kejie_start);
                System.out.print("   可借副本 :"+NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(kejie_start+5,kejie_end).trim(), '!'));
                lb_item.setKeJie(Integer.parseInt(NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(kejie_start+5,kejie_end).trim(), '!')));
                //获取责任者
                int m_author_start =hcbk_bl_jiansuo.getWebContent().indexOf("</span>",kejie_end);
                int m_author_end =hcbk_bl_jiansuo.getWebContent().indexOf("<br />",m_author_start);
                System.out.print("   责任者 :"+NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(m_author_start+7,m_author_end).trim(), '!'));
                lb_item.setM_AUTHOR(NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(m_author_start+7,m_author_end).trim(), '!'));
                //出版社和年份
                int m_publisher_year_start =hcbk_bl_jiansuo.getWebContent().indexOf("<br />",m_author_end);
                //+6为了躲开开始时的<br />
                int m_publisher_year_end =hcbk_bl_jiansuo.getWebContent().indexOf("<br />",m_publisher_year_start+6);
                //System.out.println("start " +m_publisher_year_start +"end "+m_publisher_year_end);
                //System.out.println(NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(m_publisher_year_start+6,m_publisher_year_end).trim(),'!'));
                String[] m_publisher_year = NumericCharacterReference.decode(hcbk_bl_jiansuo.getWebContent().substring(m_publisher_year_start+6,m_publisher_year_end).trim(),'!').split("&nbsp;");

                System.out.println("   出版社 :"+m_publisher_year[0]+"  年份 :  "+m_publisher_year[1]);
                lb_item.setM_PUBLISHER(m_publisher_year[0]);
                lb_item.setM_PUB_YEAR(m_publisher_year[1]);
                fromIndex = hcbk_bl_jiansuo.getWebContent().indexOf("<h3>",
                        m_publisher_year_end);
                llb.add(lb_item);
            }
            jiansuo_adapter = new JianSuo_Adapter(JianSuo_activity.this, llb); //创建适配器  
                listView.setAdapter(jiansuo_adapter);  
            break;

        }

    }
};

}

0x05 参考链接

http://www.jb51.net/article/37236.htm

android

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