Android系统。 在其他路径下连接到二级数据库

Question

I have an app working with a single local sqllite database in data/data/com.endel.psicotest/databases/psico.db

but I'm trying to connect to a secundary and old db in /data/data/com.example.psicotestv1/databases/

but when I had tried SQLiteDatabase db = getReadableDatabase(); in my DataBaseHelper_OLD return me the first database :(

public DBMain_OLD(Context contexto) {
    super(contexto, DB_NAME, null, DB_VERSION);

    //Calculamos la ruta de la base de datos
    File file = new File(contexto.getDatabasePath(DB_NAME).getPath());
    DB_PATH_OLD = "data/data/com.example.psicotest3/databases/";
    this.context  = contexto;
}

my secundary constructor with the DB_PATH_OLD

DataBaseHelper_OLD myDbHelper_OLD = new DataBaseHelper_OLD(contexto);
    Item item_OLD = myDbHelper_OLD.GetItemId(idPregunta);

I got the value of first database :(

Answer 1

If you want to share a DB between 2 apps, you will need to implement a ContentProvider . You can't share a simple database because an application normally can't access other applications' folders. (I said normally because apps with roots access can). And this is why when you call SQLiteDatabase db = getReadableDatabase(); you only get the DB from your app.

Content Provider Guide