java导出sqlite_java–在Android上简单导出和导入SQLite数据库

我在SQLiteOpenHelper中使用这个代码在我的一个应用程序中导入数据库文件。

编辑&＃xff1a;我粘贴我的FileUtils.copyFile()方法到问题。

SQLiteOpenHelper

public static String DB_FILEPATH &＃61; "/data/data/{package_name}/databases/database.db";

/**

* Copies the database file at the specified location over the current

* internal application database.

* */

public boolean importDatabase(String dbPath) throws IOException {

// Close the SQLiteOpenHelper so it will commit the created empty

// database to internal storage.

close();

File newDb &＃61; new File(dbPath);

File oldDb &＃61; new File(DB_FILEPATH);

if (newDb.exists()) {

FileUtils.copyFile(new FileInputStream(newDb), new FileOutputStream(oldDb));

// Access the copied database so SQLiteHelper will cache it and mark

// it as created.

getWritableDatabase().close();

return true;

}

return false;

}

FileUtils

public class FileUtils {

/**

* Creates the specified toFile as a byte for byte copy of the

* fromFile. If toFile already exists, then it

* will be replaced with a copy of fromFile. The name and path

* of toFile will be that of toFile.

*

* Note: fromFile and toFile will be closed by

* this function.

*

* &＃64;param fromFile

* - FileInputStream for the file to copy from.

* &＃64;param toFile

* - FileInputStream for the file to copy to.

*/

public static void copyFile(FileInputStream fromFile, FileOutputStream toFile) throws IOException {

FileChannel fromChannel &＃61; null;

FileChannel toChannel &＃61; null;

try {

fromChannel &＃61; fromFile.getChannel();

toChannel &＃61; toFile.getChannel();

fromChannel.transferTo(0, fromChannel.size(), toChannel);

} finally {

try {

if (fromChannel !&＃61; null) {

fromChannel.close();

}

} finally {

if (toChannel !&＃61; null) {

toChannel.close();

}

}

}

}

}

如有必要&＃xff0c;请不要忘记删除旧的数据库文件。