该程序主要使用 中央气象局 省份 城市数据库为基础 进行读取
城市数据库下载 http://download.csdn.net/download/xianqiang1/3896880 感谢该兄弟的分享
下载的数据库 db_weather.db 放到sdcard/weather 目录下面 方便后续操作
为了更好的了解数据库，使用 SQLite Database Browser 可以打开数据库 查看数据 和表等信息，如下
了解了表的构成可以实现操作了
androidManifest.xml
配置文件声明 添加操作sdcard 权限
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.cityselection"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<!-- sdcard操作允许 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".City_SelectionActivity"
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>
布局文件main.xml
主要使用两个 spinner 分别实现城市 省份的选择
<?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="vertical" >
<TextView
android:text="省份/直辖市"
android:textSize="20dp"
android:textStyle="bold"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Spinner
android:id="@+id/provinces"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:text="市/县"
android:textSize="20dp"
android:textStyle="bold"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Spinner
android:id="@+id/city"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
主程序City_SelectionActivity.java
package com.cityselection;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
public class City_SelectionActivity extends Activity {
/** Called when the activity is first created. */
private File f = new File("/sdcard/weather/db_weather.db"); //数据库文件
private Spinner province; //省份spinner
private Spinner city; //城市spinner
private List<String> proset=new ArrayList<String>();//省份集合
private List<String> citset=new ArrayList<String>();//城市集合
private int pro_id;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
province=(Spinner)findViewById(R.id.provinces);
ArrayAdapter<String> pro_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,getProSet());
province.setAdapter(pro_adapter);
province.setOnItemSelectedListener(new SelectProvince());
city=(Spinner)findViewById(R.id.city);
city.setOnItemSelectedListener(new SelectCity());
}
//选择改变状态
class SelectProvince implements OnItemSelectedListener{
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
//获得省份ID
pro_id=position;
city.setAdapter(getAdapter());
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
//城市 选择改变状态
class SelectCity implements OnItemSelectedListener{
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String cityname=parent.getItemAtPosition(position).toString();
//选择提示
Toast.makeText(getApplicationContext(), cityname+" "+getCityNum(position), 2000).show();
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
/**
* 返回 省份集合
*/
public List<String> getProSet(){
//打开数据库
SQLiteDatabase db1 = SQLiteDatabase.openOrCreateDatabase(f, null);
Cursor cursor=db1.query("provinces", null, null, null, null, null, null);
while(cursor.moveToNext()){
String pro=cursor.getString(cursor.getColumnIndexOrThrow("name"));
proset.add(pro);
}
cursor.close();
db1.close();
return proset;
}
/**
* 返回 城市集合
*/
public List<String> getCitSet(int pro_id){
//清空城市集合
citset.clear();
//打开数据库
SQLiteDatabase db1 = SQLiteDatabase.openOrCreateDatabase(f, null);
Cursor cursor=db1.query("citys", null, "province_id="+pro_id, null, null, null, null);
while(cursor.moveToNext()){
String pro=cursor.getString(cursor.getColumnIndexOrThrow("name"));
citset.add(pro);
}
cursor.close();
db1.close();
return citset;
}
/**
* 返回适配器
*/
public ArrayAdapter<String> getAdapter(){
ArrayAdapter<String> adapter1=new ArrayAdapter(this, android.R.layout.simple_spinner_item,getCitSet(pro_id));
return adapter1;
}
/**
* 返回城市编号 以便调用天气预报api
*/
public long getCityNum(int position){
SQLiteDatabase db1 = SQLiteDatabase.openOrCreateDatabase(f, null);
Cursor cursor=db1.query("citys", null, "province_id="+pro_id, null, null, null, null);
cursor.moveToPosition(position);
long citynum=Long.parseLong(cursor.getString(cursor.getColumnIndexOrThrow("city_num")));
cursor.close();
db1.close();
return citynum;
}
}
实现结果：
