Android 遍历全国地区位置(一)

1.布局

choose_area.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">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="#484E61">

        <TextView
            android:id="@+id/title_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:textColor="#fff"
            android:textSize="24sp" />
    </RelativeLayout>

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </ListView>
</LinearLayout>

2. 本地数据

2.1 省

Province.java

public class Province {
    private int id;
    private String provinceName;
    private String provinceCode;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getProvinceName() {
        return provinceName;
    }

    public void setProvinceName(String provinceName) {
        this.provinceName = provinceName;
    }

    public String getProvinceCode() {
        return provinceCode;
    }

    public void setProvinceCode(String provinceCode) {
        this.provinceCode = provinceCode;
    }

}

2.2 市

City.java

public class City {
    private int id;
    private String cityName;
    private String cityCode;
    private int provinceId;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getCityCode() {
        return cityCode;
    }

    public void setCityCode(String cityCode) {
        this.cityCode = cityCode;
    }

    public String getCityName() {
        return cityName;
    }

    public void setCityName(String cityName) {
        this.cityName = cityName;
    }

    public int getProvinceId() {
        return provinceId;
    }

    public void setProvinceId(int provinceId) {
        this.provinceId = provinceId;
    }
}

2.3 县

county.java

public class County {
    private int id;
    private String countyName;
    private String countyCode;
    private int cityId;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getCountyName() {
        return countyName;
    }

    public void setCountyName(String countyName) {
        this.countyName = countyName;
    }

    public String getCountyCode() {
        return countyCode;
    }

    public void setCountyCode(String countyCode) {
        this.countyCode = countyCode;
    }

    public int getCityId() {
        return cityId;
    }

    public void setCityId(int cityId) {
        this.cityId = cityId;
    }
}

2.4  创建本地数据库

CoolWeatherOpenHelper.java

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class CoolWeatherOpenHelper extends SQLiteOpenHelper {
    //注意 点后面要一个空格!
    public static final String CREATE_PROVINCE = "create table Province ("
            + "id integer primary key autoincrement, "
            + "province_name text, "
            + "province_code text)";
    public static final String CREATE_CITY = "create table City ("
            + "id integer primary key autoincrement, "
            + "city_name text, "
            + "city_code text, "
            + "province_id integer)";
    public static final String CREATE_COUNTY = "create table County ("
            + "id integer primary key autoincrement, "
            + "county_name text, "
            + "county_code text, "
            + "city_id integer)";
//注意手动打包 CursorFactory类,不可以自动在前面加上,就会出错.
    public CoolWeatherOpenHelper(Context context, String name, CursorFactory factory,int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_PROVINCE);
        db.execSQL(CREATE_CITY);
        db.execSQL(CREATE_COUNTY);

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

2.5 实例与数据库关联(实例的数据存储到本地数据库,从本地数据库中读取实例数据)

CoolWeatherDB.java

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.liqingweather.app.db.CoolWeatherOpenHelper;

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

/**
 * Created by zps on 2015/9/12.
 */
public class CoolWeatherDB {
    public static final int VERSION = 1;
    public static final String DB_NAME = "cool_weather";
    private static CoolWeatherDB coolWeatherDB;
    private SQLiteDatabase db;
    //单例模式
    private CoolWeatherDB(Context context) {
        CoolWeatherOpenHelper dbHelper = new CoolWeatherOpenHelper(context,
                DB_NAME, null, VERSION);
        db = dbHelper.getWritableDatabase();
    }

   //synchronized 避免同步创建实例
    public synchronized static CoolWeatherDB getInstance(Context context) {
        if (coolWeatherDB == null) {
            coolWeatherDB = new CoolWeatherDB(context);
        }
        return coolWeatherDB;
    }

    public void saveProvince(Province province) {
        if (province != null) {
            /*ContentValues 和HashTable类似都是一种存储的机制 但是两者最大的区别就在于，
             contenvalues只能存储基本类型的数据，像string，int之类的，
             不能存储对象这种东西，而HashTable却可以存储对象。*/
            ContentValues values = new ContentValues();
            values.put("province_name", province.getProvinceName());
            values.put("province_code", province.getProvinceCode());
            db.insert("Province", null, values);
        }
    }

    public List<Province> loadProvinces() {
        List<Province> list = new ArrayList<>();
/*      Android的query函数:
        String table =  "Orders" ;
        String[] columns = new  String[] { "CustomerName" ,  "SUM(OrderPrice)" };
        String selection = "Country=?" ;
        String[] selectionArgs = new  String[]{ "China" };
        String groupBy = "CustomerName" ;
        String having = "SUM(OrderPrice)>500" ;
        String orderBy = "CustomerName" ;
        Cursor c = db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy, null );*/
        Cursor cursor = db.query("Province", null, null, null, null, null, null);
        if (cursor.moveToFirst()) {
            do {
                Province province = new Province();
                province.setId(cursor.getInt(cursor.getColumnIndex("id")));
                province.setProvinceName(cursor.getString(cursor.getColumnIndex("province_name")));
                province.setProvinceCode(cursor.getString(cursor.getColumnIndex("province_code")));
                list.add(province);
            } while (cursor.moveToNext());
        }
        if (cursor != null) {
            cursor.close();
        }
        return list;
    }

    public void saveCity(City city) {
        if (city != null) {
            ContentValues values = new ContentValues();
            values.put("city_name", city.getCityName());
            values.put("city_code", city.getCityCode());
            values.put("province_id", city.getProvinceId());
            db.insert("City", null, values);
        }
    }

    public List<City> loadCities(int provinceId) {
        List<City> list = new ArrayList<>();
        Cursor cursor = db.query("City", null, "province_id=?",
                new String[]{String.valueOf(provinceId)}, null, null, null);
        if (cursor.moveToFirst()) {
            do {
                City city = new City();
                city.setId(cursor.getInt(cursor.getColumnIndex("id")));
                city.setCityName(cursor.getString(cursor.getColumnIndex("city_name")));
                city.setCityCode(cursor.getString(cursor.getColumnIndex("city_code")));
                city.setProvinceId(provinceId);
                list.add(city);

            } while (cursor.moveToNext());
        }
        if (cursor != null) {
            cursor.close();
        }
        return list;
    }

    public void saveCounty(County county) {
        if (county != null) {
            ContentValues values = new ContentValues();
            values.put("county_name", county.getCountyName());
            values.put("county_code", county.getCountyCode());
            values.put("city_id", county.getCityId());
            db.insert("County", null, values);
        }
    }

    public List<County> loadCounties(int cityId) {
        List<County> list = new ArrayList<>();
        Cursor cursor = db.query("County", null, "city_id = ?",
                new String[]{String.valueOf(cityId)}, null, null, null);
        if (cursor.moveToFirst()) {
            do {
                County county = new County();
                county.setId(cursor.getInt(cursor.getColumnIndex("id")));
                county.setCountyName(cursor.getString(cursor.getColumnIndex("county_name")));
                county.setCountyCode(cursor.getString(cursor.getColumnIndex("county_code")));
                county.setCityId(cityId);
                list.add(county);

            } while (cursor.moveToNext());
        }
        if (cursor != null) {
            cursor.close();
        }
        return list;
    }

}

3. 服务器

3.1 获取服务器的数据

HttpUtil.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by zps on 2015/9/12.
 */
public class HttpUtil {
    public static void sendHttpRequest(final String address
            , final HttpCallbackListener listener) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection = null;
                try {
                    URL url = new URL(address);
                    connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(8000);
                    connection.setReadTimeout(8000);

                    InputStream in = connection.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
                    StringBuilder response = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) != null) {
                        response.append(line);
                    }
                    if (listener != null) {
                        listener.onFinish(response.toString());
                    }
                } catch (Exception e) {
                    if (listener != null) {
                        listener.onError(e);
                    }
                } finally {
                    if (connection != null) {
                        connection.disconnect();

                    }
                }
            }
        }).start();
    }

}

3.2 HttpCallbackListener接口服务返回的结果

HttpCallbackListener.java

/**
 * Created by zps on 2015/9/12.
 */
public interface HttpCallbackListener {
    void onFinish(String response);

    void onError(Exception e);
}

3.3 服务器的数据解析

Utility.java

import android.text.TextUtils;
import com.liqingweather.app.model.City;
import com.liqingweather.app.model.CoolWeatherDB;
import com.liqingweather.app.model.County;
import com.liqingweather.app.model.Province;

/**
 * Created by zps on 2015/9/12.
 */
public class Utility {

    public synchronized static boolean handleProvincesResponse(CoolWeatherDB coolWeatherDB,String response){
        //isEmpty用于判断""或null
        if(!TextUtils.isEmpty(response)){
            String[] allProvinces = response.split(",");
            if (allProvinces != null && allProvinces.length>0){
                for (String p : allProvinces){
                    //split分离,'\\|'传给正则就是"\|",表示对|进行转义，不作为特殊字符使用
                    String[] array = p.split("\\|");
                    Province province = new Province();
                    //数据格式为"代号|城市",故array[0]为代号
                    province.setProvinceCode(array[0]);
                    province.setProvinceName(array[1]);
                    coolWeatherDB.saveProvince(province);
                }
                return true;
            }

        }

        return false;
    }
    public static boolean handleCitiesResponse(CoolWeatherDB coolWeatherDB,
                                               String response, int provinceId) {
        if (!TextUtils.isEmpty(response)) {
            String[] allCities = response.split(",");
            if (allCities != null && allCities.length > 0) {
                for (String c : allCities) {
                    String[] array = c.split("\\|");
                    City city = new City();
                    city.setCityCode(array[0]);
                    city.setCityName(array[1]);
                    city.setProvinceId(provinceId);
                    coolWeatherDB.saveCity(city);
                }
                return true;
            }
        }
        return false;
    }
    public static boolean handleCountiesResponse(CoolWeatherDB coolWeatherDB,
                                                 String response, int cityId) {
        if (!TextUtils.isEmpty(response)) {
            String[] allCounties = response.split(",");
            if (allCounties != null && allCounties.length > 0) {
                for (String c : allCounties) {
                    String[] array = c.split("\\|");
                    County county = new County();
                    county.setCountyCode(array[0]);
                    county.setCountyName(array[1]);
                    county.setCityId(cityId);
                    coolWeatherDB.saveCounty(county);
                }
                return true;
            }
        }
        return false;
    }
}

4. 遍历数据的活动

ChooseAreaActivity.java

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.liqingweather.app.R;
import com.liqingweather.app.model.City;
import com.liqingweather.app.model.CoolWeatherDB;
import com.liqingweather.app.model.County;
import com.liqingweather.app.model.Province;
import com.liqingweather.app.util.HttpCallbackListener;
import com.liqingweather.app.util.HttpUtil;
import com.liqingweather.app.util.Utility;

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

public class ChooseAreaActivity extends Activity {
    public static final int LEVEL_PROVINCE = 0;
    public static final int LEVEL_CITY = 1;
    public static final int LEVEL_COUNTY = 2;
    private ProgressDialog progressDialog;
    private TextView titleText;
    private ListView listView;
    private ArrayAdapter<String> adapter;
    private CoolWeatherDB coolWeatherDB;
    private List<String> dataList = new ArrayList<>();
    private List<Province> provinceList;
    private List<City> cityList;
    private List<County> countyList;
    private Province selectedProvince;
    private City selectedCity;
    private int currentLevel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.choose_area);
        titleText = (TextView) findViewById(R.id.title_text);
        listView = (ListView) findViewById(R.id.list_view);
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataList);
        listView.setAdapter(adapter);
        coolWeatherDB = CoolWeatherDB.getInstance(this);
        //注意AdapterView.OnItemClickListener()写法是错误的!个人理解,没有事先加载AdapterView.OnItemClickListener()方法
        listView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                if (currentLevel == LEVEL_PROVINCE) {
                    selectedProvince = provinceList.get(position);
                    queryCities();
                } else if (currentLevel == LEVEL_CITY) {
                    selectedCity = cityList.get(position);
                    queryCounties();
                }

            }
        });
        queryProvinces();
    }

    private void queryProvinces() {
        provinceList = coolWeatherDB.loadProvinces();
        if (provinceList.size() > 0) {
            dataList.clear();
            for (Province province : provinceList) {
                dataList.add(province.getProvinceName());
            }
            //notifyDataSetChanged()可以在修改适配器绑定的数组后，
            // 不用重新刷新Activity，通知Activity更新ListView。
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            titleText.setText("中国");
            currentLevel = LEVEL_PROVINCE;
        } else {
            //注意大小写"province"
            queryFromServer(null, "province");
        }
    }

    private void queryCities() {
        cityList = coolWeatherDB.loadCities(selectedProvince.getId());
        if (cityList.size() > 0) {
            dataList.clear();
            for (City city : cityList) {
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            titleText.setText(selectedProvince.getProvinceName());
            currentLevel = LEVEL_CITY;
        } else {

            //注意是getProvinceCode()
            queryFromServer(selectedProvince.getProvinceCode(), "city");
        }
    }

    private void queryCounties() {
        countyList = coolWeatherDB.loadCounties(selectedCity.getId());
        if (countyList.size() > 0) {
            dataList.clear();
            for (County county : countyList) {
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            titleText.setText(selectedCity.getCityName());
            currentLevel = LEVEL_COUNTY;
        } else {
            queryFromServer(selectedCity.getCityCode(), "county");
        }
    }

    private void queryFromServer(final String code, final String type) {
        String address;
        if (!TextUtils.isEmpty(code)) {
            address = "http://www.weather.com.cn/data/list3/city" + code +
                    ".xml";
        } else {
            address = "http://www.weather.com.cn/data/list3/city.xml";
        }
        showProgressDialog();
        HttpUtil.sendHttpRequest(address, new HttpCallbackListener() {
            @Override
            public void onFinish(String response) {
                boolean result = false;
                if ("province".equals(type)) {
                    result = Utility.handleProvincesResponse(coolWeatherDB,
                            response);
                } else if ("city".equals(type)) {
                    result = Utility.handleCitiesResponse(coolWeatherDB,
                            response, selectedProvince.getId());
                } else if ("county".equals(type)) {
                    result = Utility.handleCountiesResponse(coolWeatherDB,
                            response, selectedCity.getId());
                }
                if (result) {

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            closeProgressDialog();
                            if ("province".equals(type)) {
                                queryProvinces();
                            } else if ("city".equals(type)) {
                                queryCities();
                            } else if ("county".equals(type)) {
                                queryCounties();
                            }
                        }
                    });
                }
            }

            @Override
            public void onError(Exception e) {

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        closeProgressDialog();
                        Toast.makeText(ChooseAreaActivity.this, "加载失败", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
    }

    private void showProgressDialog() {
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(this);
            progressDialog.setMessage("正在加载...");
            progressDialog.setCanceledOnTouchOutside(false);

        }
        progressDialog.show();
    }

    private void closeProgressDialog() {
        if (progressDialog != null) {
            progressDialog.dismiss();
        }
    }

    @Override
    public void onBackPressed() {

        if (currentLevel == LEVEL_COUNTY) {
            queryCities();

        } else if (currentLevel == LEVEL_CITY) {
            queryProvinces();
        } else {
            finish();
        }
    }
}

5. AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".activity.ChooseAreaActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>