转载请注明出处，谢谢http://blog.csdn.net/harryweasley/article/details/46557807
本篇博客的主要目的，是介绍怎样将数据库文件保存到手机系统文件，并且可以显示各个省市地的名字。
数据库一共有三个表，他们分别是（后面我将上传整个文件和数据库文件）
省表
CREATE TABLE IF NOT EXISTS `fs_province` ( `ProvinceID` bigint(20) NOT NULL, `ProvinceName` varchar(50) DEFAULT NULL, `DateCreated` datetime DEFAULT NULL, `DateUpdated` datetime DEFAULT NULL, PRIMARY KEY (`ProvinceID`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `fs_city` ( `CityID` bigint(20) NOT NULL, `CityName` varchar(50) DEFAULT NULL, `ZipCode` varchar(50) DEFAULT NULL, `ProvinceID` bigint(20) DEFAULT NULL, `DateCreated` datetime DEFAULT NULL, `DateUpdated` datetime DEFAULT NULL, PRIMARY KEY (`CityID`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `fs_district` ( `DistrictID` bigint(20) NOT NULL, `DistrictName` varchar(50) DEFAULT NULL, `CityID` bigint(20) DEFAULT NULL, `DateCreated` datetime DEFAULT NULL, `DateUpdated` datetime DEFAULT NULL, PRIMARY KEY (`DistrictID`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
省份表和城市表中，都有北京，上海，重庆，天津这四个城市，所以要自己判断一下。
先看下效果图：
我们将二进制的数据库文件放入工程的res/raw下面，如图所示：
整个程序的主要功能，我都封装在了CityInfoDataSupport2这个类中。
package com.example.province;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Environment;
public class CityInfoDataSupport2 {
private static CityInfoDataSupport2 cityInfoDataSupport;
public static final String PACKAGE_NAME = "com.example.province";
/**
* 数据库在手机系统内存里的路径
*/
private static String DATABASE_PATH = "/data"
+ Environment.getDataDirectory() + "/"+PACKAGE_NAME + "/databases/";
/**
* 数据库的名称
*/
public static final String dbName = "mzk_db";
private SQLiteDatabase mSDB;
public static CityInfoDataSupport2 getInstance(Context context) {
initDataBase(context);
if (cityInfoDataSupport == null) {
cityInfoDataSupport = new CityInfoDataSupport2();
}
return cityInfoDataSupport;
}
/**
* 初试化数据库
*/
private static void initDataBase(Context context) {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
// 如果不存在，则将raw里的数据存入手机sd卡
copyDataBase(context);
}
}
/**
* 复制数据库到手机指定文件夹下
*
* @throws IOException
*/
private static void copyDataBase(Context context) {
String databaseFilenames = DATABASE_PATH + dbName;
File dir = new File(DATABASE_PATH);
FileOutputStream os = null;
InputStream is = null;
// 判断文件夹是否存在，不存在就创建一个
if (!dir.exists()) {
dir.mkdirs();
}
try {
// 得到数据库的输出流
os = new FileOutputStream(databaseFilenames);
// 得到数据文件的输入流
is = context.getResources().openRawResource(R.raw.mzk_db);
byte[] buffer = new byte[8192];
int count = 0;
while ((count = is.read(buffer)) != -1) {
os.write(buffer, 0, count);
os.flush();
}
// 之所以不在这里初始化，是因为这边是静态的方法，而mSDB并没有设置为静态的，也不推荐设为静态的
// mSDB = SQLiteDatabase.openOrCreateDatabase(DATABASE_PATH +
// dbName, null);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
os.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 判断数据库是否存在
*
* @return
*/
private static boolean checkDataBase() {
SQLiteDatabase checkDB = null;
String databaseFilename = DATABASE_PATH + dbName;
// 要自己加上try catch方法
try {
// 返回最新的数据库
checkDB = SQLiteDatabase.openDatabase(databaseFilename, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
// TODO: handle exception
}
if (checkDB != null) {
checkDB.close();
}
// 如果checkDB为null，则没有数据库，返回false
return checkDB == null ? false : true;
}
/**
* 查询所有省份的信息
*
* @return 省份信息
*/
public ArrayList<City> queryProvince() {
// 创建数据库
mSDB = SQLiteDatabase
.openOrCreateDatabase(DATABASE_PATH + dbName, null);
ArrayList<City> list = new ArrayList<City>();
String sql = "select * from fs_province";
Cursor cursor = mSDB.rawQuery(sql, null);
while (cursor.moveToNext()) {
City city = new City();
String id = cursor.getString(cursor.getColumnIndex("ProvinceID"));
String name = cursor.getString(cursor
.getColumnIndex("ProvinceName"));
city.setName(name);
city.setId(id);
list.add(city);
}
if (cursor != null) {
cursor.close();
}
return list;
}
/**
* 通过省份来查找城市
*
* @param provinceId
* 省份的id
* @return 该省的所有城市
*/
public ArrayList<City> queryCityByProvince(String provinceId) {
// 创建数据库
mSDB = SQLiteDatabase
.openOrCreateDatabase(DATABASE_PATH + dbName, null);
ArrayList<City> list = new ArrayList<City>();
String sql = "select * from fs_city where ProvinceID=" + provinceId;
Cursor cursor = mSDB.rawQuery(sql, null);
while (cursor.moveToNext()) {
City city = new City();
String id = cursor.getString(cursor.getColumnIndex("CityID"));
String name = cursor.getString(cursor.getColumnIndex("CityName"));
city.setName(name);
city.setId(id);
list.add(city);
}
if (cursor != null) {
cursor.close();
}
return list;
}
/**
* 通过城市来查找县区
*
* @param provinceId
* 省份的id
* @return 该省的所有城市
*/
public ArrayList<City> queryDistrictByCity(String cityId) {
// 创建数据库
mSDB = SQLiteDatabase
.openOrCreateDatabase(DATABASE_PATH + dbName, null);
ArrayList<City> list = new ArrayList<City>();
String sql = "select * from fs_district where CityID=" + cityId;
Cursor cursor = mSDB.rawQuery(sql, null);
while (cursor.moveToNext()) {
City city = new City();
String id = cursor.getString(cursor.getColumnIndex("DistrictID"));
String name = cursor.getString(cursor
.getColumnIndex("DistrictName"));
city.setName(name);
city.setId(id);
list.add(city);
}
if (cursor != null) {
cursor.close();
}
return list;
}
public void closeDataBase() {
if (mSDB != null) {
mSDB.close();
}
}
}
接下来就是各个Activity的内容了，都很简单，我就贴一个吧，之后我将上传整个程序。
package com.example.province;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
/**
* 省份的名字，其中北京，上海，天津，重庆，香港，澳门这六个是特殊的例子
* @author lgx
*
*/
public class MainActivity extends Activity {
ArrayList<City> province;
ListView province_list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
province_list = (ListView) findViewById(R.id.province_list);
province = CityInfoDataSupport2.getInstance(this).queryProvince();
TestAdapter adapter = new TestAdapter(this, province);
province_list.setAdapter(adapter);
province_list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String ProviceId = province.get(position).getId();
String proviceName = province.get(position).getName();
if (proviceName.equals("北京") || proviceName.equals("天津")
|| proviceName.equals("上海") || proviceName.equals("重庆")) {
Intent intent = new Intent(MainActivity.this,
DistrictActivity.class);
intent.putExtra("pcode", ProviceId);
startActivity(intent);
} else {
Intent intent = new Intent(MainActivity.this,
CityActivity.class);
intent.putExtra("pcode", ProviceId);
startActivity(intent);
}
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
// CityInfoDataSupport.getInstance(this).close();
}
}
项目下载地址：http://download.csdn.net/detail/harryweasley/8807143
原文地址：http://blog.csdn.net/harryweasley/article/details/46557807
