Question

I have two database to support two languages for my application.

I want to change database when I change language from settings.

Is it possible?? How can i do this?

Answer 1

当您提供具有数据库名称的字符串资源时，应该可以非常轻松：

在/res/values/strings.xml中添加如下行：

<string name="db_name">database</string>

在/res/values-de/strings.xml放置该行：

<string name="db_name">database_de</string>

在您的DBHelper类中，根据语言设置使用当前活动的字符串文件的数据库名称：

public class DBHelper extends SQLiteOpenHelper {

    private final static int DB_VERSION = 1;
    private static DBHelper sInstance;

    /**
     * Provides access to DBHelper singleton.
     * @param context
     * @return
     */
    public static DBHelper getInstance(Context context) {
        // Use the application context, which will ensure that you
        // don't accidentally leak an Activity's context.
        // See this article for more information: http://bit.ly/6LRzfx
        if (sInstance == null) {
            sInstance = new DBHelper(context.getApplicationContext());
        }
        return sInstance;
    }

    /**
     * Constructor should be private to prevent direct instantiation.
     * make call to static factory method "getInstance()" instead.
     */
    private DBHelper(Context context) {
        // here comes the magic:
        String dbName = context.getString(R.string.db_name);
        super(context, db_name, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
         // ...
    }

    // ...
}

Answer 2

使用 Ridcully 解决方案，您只需要添加数据库名称部分，您需要添加的就是您扩展的类。

这个例子来自你提到的图书馆：

public class MyDatabase extends SQLiteAssetHelper {


    private static final int DATABASE_VERSION = 1;

    public MyDatabase(Context context) {
        // here comes the magic:
        String dbName = context.getString(R.string.db_name);
        super(context, dbName , null, DATABASE_VERSION);
    }
}

另一个数据库类可以是：

public class MyDatabase2 extends SQLiteAssetHelper {


    private static final int DATABASE_VERSION = 1;

    public MyDatabase(Context context) {
        // here comes the magic:
        String dbName = context.getString(R.string.db_name_2);
        super(context, dbName , null, DATABASE_VERSION);
    }
}

注意：要使用SQLiteAssetHelper，您需要自己创建数据库，并放入assets / databases文件夹。

您可以使用此应用Sqlitebrowser

创建sqlite数据库

How to use multiple databases like multiple languages in android

2 个答案: