从Android中的外部存储访问或打开数据库

Question

--> Okay , here i have a Sq-lite database in SD card.

  (String DB_PATH = Environment.getExternalStorageDirectory().getPath().toString();)

--> Checking if database exists

        dbFile = new File(DB_PATH + DB_NAME );
        if(dbFile.exists()== true)
        {
            //set text db exists
            open_DB();

        }
        else 
        {
            //set text db does not exist
            return;
        }

--> on debugging i could confirm the existence of the database file. but when opening the
database i get exception

    SQLiteDatabase checkDB = null;
    try 
    {
        dbFile = new File(DB_PATH + DB_NAME);
        myDataBase = SQLiteDatabase.openOrCreateDatabase(dbFile, null);

        //myDataBase = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, 0);
        //also tried this

        //set text bd opened
    }
    catch(SQLiteException e) 
    {
        //set text bd unable open
        return;
    }

Answer 1

Probably your problem is caused by flags or file so try to use this:

dbFile = new File(DB_PATH + DB_NAME);
if (dbFile.exists()) {
   db = SQLiteDatabase.openDatabase(db_path, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS | SQLiteDatabase.CREATE_IF_NECESSARY);
}

Let me know.