Android中的省，市，区，实现三级联动

android中的省，市，区，实现三级联动

通常我们会在买票的时候用到查询市，或者旅游时用到地区的查询，都会涉及到。。。。。。

下面二话不说直接贴代码。

这里写代码片xml布局代码<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".MainActivity" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <TextView            android:id="@+id/tv_Province"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:text="省份" />        <TextView            android:id="@+id/tv_City"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:text="城市" />        <TextView            android:id="@+id/tv_Zone"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:text="区域" />    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <ListView            android:id="@+id/lv_Province"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1" />        <ListView            android:id="@+id/lv_City"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1" />        <ListView            android:id="@+id/lv_Zone"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1" />    </LinearLayout></LinearLayout>

这里写代码片item布局代码<?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/mtv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="城市"        android:gravity="center"         /></LinearLayout>

这里写代码片两个javaBean类其一Province类package com.example.cn.bgs.jsonsspdemo;import java.util.List;public class Province {    private List<City> cityList;    private String provinceName;    public List<City> getCityList() {        return cityList;    }    public void setCityList(List<City> cityList) {        this.cityList = cityList;    }    public String getProvinceName() {        return provinceName;    }    public void setProvinceName(String provinceName) {        this.provinceName = provinceName;    }}

这里写代码片其二City类package com.example.cn.bgs.jsonsspdemo;import java.util.List;public class City {    private List<String> zoneList;    private String cityName;    public List<String> getZoneList() {        return zoneList;    }    public void setZoneList(List<String> zoneList) {        this.zoneList = zoneList;    }    public String getCityName() {        return cityName;    }    public void setCityName(String cityName) {        this.cityName = cityName;    }}

这里写代码片MyAdapter代码package com.example.cn.bgs.jsonsspdemo;import java.util.List;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class MyAdapter<T> extends BaseAdapter {    private Context context;    private List<T> list;    public MyAdapter(Context context, List<T> list) {        this.context = context;        this.list = list;    }    @Override    public int getCount() {        // TODO Auto-generated method stub        if (list == null) {            return 0;        }        return list.size();    }    public void refresh(List<T> list) {        this.list = list;        notifyDataSetChanged();    }    @Override    public T getItem(int position) {        // TODO Auto-generated method stub        return list.get(position);    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return position;    }    @SuppressWarnings("unchecked")    @Override    public View getView(int position, View convertView, ViewGroup parent) {        // TODO Auto-generated method stub        ViewHolder holder;        if (convertView == null) {            holder = new ViewHolder();            convertView = View.inflate(context, R.layout.item, null);            holder.mtv = (TextView) convertView.findViewById(R.id.mtv);            convertView.setTag(holder);        } else {            holder = (ViewHolder) convertView.getTag();        }        T t = list.get(position);        if (t instanceof Province) {            Province p = (Province) t;            holder.mtv.setText(p.getProvinceName());        }        if (t instanceof City) {            City c = (City) t;            holder.mtv.setText(c.getCityName());        }        if (t instanceof String) {            String zone = (String) t;            holder.mtv.setText(zone);        }        return convertView;    }    class ViewHolder {        TextView mtv;    }}

这里写代码片MainActivity代码package com.example.cn.bgs.jsonsspdemo;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import android.os.Bundle;import android.app.Activity;import android.content.res.AssetManager;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.TextView;public class MainActivity extends Activity {    private TextView tv_Province, tv_City, tv_Zone;    private ListView lv_Province, lv_City, lv_Zone;    private MyAdapter proadapter;    private MyAdapter cityadapter;    private MyAdapter zoneadapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        String s = getData();        List<Province> proList = getJson(s);        proadapter = new MyAdapter<Province>(MainActivity.this, proList);        lv_Province.setAdapter(proadapter);        lv_Province.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                    int position, long id) {                // TODO Auto-generated method stub                Province p = (Province) proadapter.getItem(position);                tv_Province.setText(p.getProvinceName());                tv_City.setText("市");                tv_Zone.setText("区");                List<City> cList = p.getCityList();                if (cityadapter == null) {                    cityadapter = new MyAdapter<City>(MainActivity.this, cList);                    lv_City.setAdapter(cityadapter);                } else {                    cityadapter.refresh(cList);                }                if (zoneadapter != null) {                    zoneadapter.refresh(null);                }            }        });        lv_City.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                    int position, long id) {                City c = (City) cityadapter.getItem(position);                List<String> zoneList = c.getZoneList();                tv_City.setText(c.getCityName());                if (zoneadapter == null) {                    zoneadapter = new MyAdapter<String>(MainActivity.this,                            zoneList);                    lv_Zone.setAdapter(zoneadapter);                } else {                    zoneadapter.refresh(zoneList);                }            }        });        lv_Zone.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                    int position, long id) {                String string = (String) zoneadapter.getItem(position);                tv_Zone.setText(string);            }        });    }    private void initView() {        tv_Province = (TextView) findViewById(R.id.tv_Province);        tv_City = (TextView) findViewById(R.id.tv_City);        tv_Zone = (TextView) findViewById(R.id.tv_Zone);        lv_Province = (ListView) findViewById(R.id.lv_Province);        lv_City = (ListView) findViewById(R.id.lv_City);        lv_Zone = (ListView) findViewById(R.id.lv_Zone);    }    public String getData() {        try {            AssetManager asset = getResources().getAssets();            InputStream in = asset.open("ssq.txt");            InputStreamReader reader = new InputStreamReader(in);            BufferedReader br = new BufferedReader(reader);            StringBuffer buffer = new StringBuffer();            String line;            while ((line = br.readLine()) != null) {                buffer.append(line);            }            br.close();            return buffer.toString();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }    public List<Province> getJson(String s) {        try {            List<Province> proList = new ArrayList<Province>();            JSONArray ja = new JSONArray(s);            for (int i = 0; i < ja.length(); i++) {                Province p = new Province();                JSONObject jb = ja.getJSONObject(i);                String proName = jb.getString("name");                JSONArray jacity = jb.getJSONArray("city");                List<City> cityList = new ArrayList<City>();                for (int j = 0; j < jacity.length(); j++) {                    City c = new City();                    JSONObject jbb = jacity.getJSONObject(j);                    String cityName = jbb.getString("name");                    JSONArray jazone = jbb.getJSONArray("area");                    List<String> zoneList = new ArrayList<String>();                    for (int k = 0; k < jazone.length(); k++) {                        String zoneName = jazone.getString(k);                        zoneList.add(zoneName);                    }                    c.setZoneList(zoneList);                    c.setCityName(cityName);                    cityList.add(c);                }                p.setProvinceName(proName);                p.setCityList(cityList);                proList.add(p);            }            return proList;        } catch (JSONException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }}

这里写代码片assets文件夹ssq.txt文件

代码都写完了，下面看一下效果图：

好了，一切都结束了，谢谢。