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

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

package="com.cityselection"

android:versionCode="1"

android:versionName="1.0">

android:icon="@drawable/ic_launcher"

android:label="@string/app_name">

android:name=".City_SelectionActivity"

android:label="@string/app_name">

package="com.cityselection"

android:versionCode="1"

android:versionName="1.0" >

android:icon="@drawable/ic_launcher"

android:label="@string/app_name" >

android:name=".City_SelectionActivity"

android:label="@string/app_name" >

布局文件main.xml

主要使用两个 spinner 分别实现城市 省份的选择

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical">

android:text="省份/直辖市"

android:textSize="20dp"

android:textStyle="bold"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

android:id="@+id/provinces"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

android:text="市/县"

android:textSize="20dp"

android:textStyle="bold"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

android:id="@+id/city"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

android:text="省份/直辖市"

android:textSize="20dp"

android:textStyle="bold"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

android:id="@+id/provinces"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

android:text="市/县"

android:textSize="20dp"

android:textStyle="bold"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

android:id="@+id/city"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

主程序City_SelectionActivity.java

packagecom.cityselection;

importjava.io.File;

importjava.util.ArrayList;

importjava.util.List;

importandroid.app.Activity;

importandroid.database.Cursor;

importandroid.database.sqlite.SQLiteDatabase;

importandroid.os.Bundle;

importandroid.view.View;

importandroid.widget.AdapterView;

importandroid.widget.AdapterView.OnItemSelectedListener;

importandroid.widget.ArrayAdapter;

importandroid.widget.Spinner;

importandroid.widget.Toast;

publicclassCity_SelectionActivityextendsActivity {

/** Called when the activity is first created. */

privateFile f = newFile("/sdcard/weather/db_weather.db");//数据库文件

privateSpinner province;//省份spinner

privateSpinner city; //城市spinner

privateList proset=newArrayList();//省份集合

privateList citset=newArrayList();//城市集合

privateintpro_id;

@Override

publicvoidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

province=(Spinner)findViewById(R.id.provinces);

ArrayAdapter pro_adapter=newArrayAdapter(this, android.R.layout.simple_spinner_item,getProSet());

province.setAdapter(pro_adapter);

province.setOnItemSelectedListener(newSelectProvince());

city=(Spinner)findViewById(R.id.city);

city.setOnItemSelectedListener(newSelectCity());

}

//选择改变状态

classSelectProvinceimplementsOnItemSelectedListener{

publicvoidonItemSelected(AdapterView> parent, View view,

intposition, longid) {

// TODO Auto-generated method stub

//获得省份ID

pro_id=position;

city.setAdapter(getAdapter());

}

publicvoidonNothingSelected(AdapterView> arg0) {

// TODO Auto-generated method stub

}

}

//城市 选择改变状态

classSelectCity implementsOnItemSelectedListener{

publicvoidonItemSelected(AdapterView> parent, View view,

intposition, longid) {

// TODO Auto-generated method stub

String cityname=parent.getItemAtPosition(position).toString();

//选择提示

Toast.makeText(getApplicationContext(), cityname+" "+getCityNum(position),2000).show();

}

publicvoidonNothingSelected(AdapterView> arg0) {

// TODO Auto-generated method stub

}

}

/**

* 返回 省份集合

*/

publicList 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();

returnproset;

}

/**

* 返回 城市集合

*/

publicList getCitSet(intpro_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();

returncitset;

}

/**

* 返回适配器

*/

publicArrayAdapter getAdapter(){

ArrayAdapter adapter1=newArrayAdapter(this, android.R.layout.simple_spinner_item,getCitSet(pro_id));

returnadapter1;

}

/**

* 返回城市编号 以便调用天气预报api

*/

publiclonggetCityNum(intposition){

SQLiteDatabase db1 = SQLiteDatabase.openOrCreateDatabase(f,null);

Cursor cursor=db1.query("citys",null,"province_id="+pro_id,null,null,null,null);

cursor.moveToPosition(position);

longcitynum=Long.parseLong(cursor.getString(cursor.getColumnIndexOrThrow("city_num")));

cursor.close();

db1.close();

returncitynum;

}

}

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 proset=new ArrayList();//省份集合

private List citset=new ArrayList();//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 pro_adapter=new ArrayAdapter(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 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 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 getAdapter(){

ArrayAdapter 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：