在我的应用程序中，我为两种不同的语言创建了两个不同的数据库，数据库都位于assets文件夹中，基于它应该占用该特定数据库的语言环境。不知道如何实现它，我虽然将数据库名称放在不同语言的字符串文件夹中，但如何将该名称作为DB_NAME传递并不确定。想知道如何在资产文件夹中有两个不同的数据库时本地化数据库。下面是我的代码
public class MatDatabase {
protected static final String TAG = "ability Database";
protected DataBaseHelper mDbHelper;
protected SQLiteDatabase mDb;
protected static final String DATABASE_NAME = "ability.sqlite";
protected static final int DATABASE_VERSION = 1;
protected final Context mCtx;
public class DataBaseHelper extends SQLiteOpenHelper {
// The Android's default system path of your application database.
private final String DB_PATH = Environment.getDataDirectory()
+ "/data/com.in.android.ability/databases/";
private final static String DB_NAME = "ability.sqlite";
private SQLiteDatabase myDataBase;
private final Context myContext;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, DATABASE_VERSION);
this.myContext = context;
//myContext.getResources().getString(R.string.dbname);
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
// do nothing - database already exist
} else {
this.getWritableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
} finally {
this.close();
}
}
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String NAME = myContext.getResources().getString(R.string.dbname);
String myPath = DB_PATH + NAME;
File dbFile = new File(myPath);
return dbFile.exists();
} catch (SQLiteException e) {
// database does't exist yet.
e.printStackTrace();
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
this.getWritableDatabase();
}}