Android开发实现读取assets目录下db文件的方法示例

Android开发实现读取开发实现读取assets目录下目录下db文件的方法示例文件的方法示例

主要介绍了Android开发实现读取assets目录下db文件的方法,结合实例形式分析了Android针对assets目录下

SQLite数据库文件的相关操作技巧,需要的朋友可以参考下

本文实例讲述了Android开发实现读取assets目录下db文件的方法。分享给大家供大家参考，具体如下：

最近准备打算写一个关于天气预报的app，偶然的机会在一大神的博客上看到了一个获取天气的api，获取天气是通过城市的

cityID，项目中准备通过读取weather_city.db数据库来查询cityID，这篇文章写怎么读取assets目录下的db文件，其实方法也挺

简单的就是把assets目录下的db文件复制一份到”/data/data/” + packName + “/”目录下而已。

public class DBManager {

public SQLiteDatabase DBManager(String packName) {

String dbPath = "/data/data/" + packName

+ "/databases/" + DB_NAME;

if (!new File(dbPath).exists()) {

try {

FileOutputStream out = new FileOutputStream(dbPath);

InputStream in = mContext.getAssets().open("weather_city.db");

byte[] buffer = new byte[1024];

int readBytes = 0;

while ((readBytes = in.read(buffer)) != -1)

}

return SQLiteDatabase.openOrCreateDatabase(dbPath, null);

}

//查询

public City query(SQLiteDatabase sqliteDB, String[] columns, String selection, String[] selectionArgs) {

City city = null;

try {

String table = "city";

Cursor cursor = sqliteDB.query(table, columns, selection, selectionArgs, null, null, null);

if (cursor.moveToFirst()) {

String areaCode = cursor.getString(cursor.getColumnIndex("area_code"));

city = new City(parentCity, name, pinyin, phoneCode, cityID, areaCode);

cursor.moveToNext();

cursor.close();

}

} catch (Exception e) {

e.printStackTrace();

}

return city;

}

private String phoneCode;

private String cityID;

private String areaCode;

public City(String parentCity, String childCity, String pinyin, String phoneCode, String cityID, String areaCode) {

this.parentCity = parentCity;

this.childCity = childCity;

this.pinyin = pinyin;

this.phoneCode = phoneCode;

this.cityID = cityID;

this.areaCode = areaCode;