SQLite Database on SDCard

I would like to store the SQLite database on sdcard instead of the internal memory. I serched a lot on google but I didn't find an answer. This is the sqliteopenhelper

public class RegistrationOpenHelper extends SQLiteOpenHelper{
 public static final String DATABASE_NAME = "REGISTRATION_DB";
 public static final String TABLE_NAME = "REGISTRATION_TABLE";
 public static final int VERSION = 1;
 public static final String KEY_ID = "_id";
 public static final String FNAME = "F_NAME";
 public static final String LNAME = "L_NAME";
 public static final String FILE_DIR = "/sdcard/Leonardo";
 public static final String DESC = "DESC";
 public static final String SCRIPT = "create table " + TABLE_NAME + " ("
           + KEY_ID + " integer primary key autoincrement, " + FNAME
           + " text not null, " + DESC + " text not null, " + LNAME +" text not null );";
 public RegistrationOpenHelper(Context context, String name,
           CursorFactory factory, int version) {
          super(context, name, factory, version);
          SQLiteDatabase.openOrCreateDatabase(Environment.getExternalStorageDirectory()
                    + File.separator + FILE_DIR
                    + File.separator + DATABASE_NAME, null);      

 }

 @Override
 public void onCreate(SQLiteDatabase db) {
  // TODO Auto-generated method stub
  db.execSQL(SCRIPT);
 }
 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  // TODO Auto-generated method stub
  db.execSQL("drop table " + TABLE_NAME);
  onCreate(db);
 }
}

and this is my Adapter

public class RegistrationAdapter {
 SQLiteDatabase database_ob;
 RegistrationOpenHelper openHelper_ob;
 Context context;



 public RegistrationAdapter(Context c) {
  context = c;
 }

 public RegistrationAdapter opnToRead() {
  openHelper_ob = new RegistrationOpenHelper(context,openHelper_ob.DATABASE_NAME,
          null, openHelper_ob.VERSION);
  database_ob = openHelper_ob.getReadableDatabase();
  return this;


 }
 public RegistrationAdapter opnToWrite() {
      openHelper_ob = new RegistrationOpenHelper(context,
              openHelper_ob.DATABASE_NAME, null, openHelper_ob.VERSION);
      database_ob = openHelper_ob.getWritableDatabase();
      return this;

 }


 public void Close() {
      database_ob.close();
 }

 public long insertDetails(String fname, String desc, String lname) {
      ContentValues contentValues = new ContentValues();
      contentValues.put(openHelper_ob.FNAME, fname);
      contentValues.put(openHelper_ob.DESC, desc);
      contentValues.put(openHelper_ob.LNAME, lname);
      opnToWrite();
      long val = database_ob.insert(openHelper_ob.TABLE_NAME, null,
              contentValues);
      Close();
      return val;
 }

 public Cursor queryName() {
     String[] cols = { openHelper_ob.KEY_ID, openHelper_ob.FNAME, openHelper_ob.DESC,
         openHelper_ob.LNAME };
     opnToWrite();
     Cursor c = database_ob.query(openHelper_ob.TABLE_NAME, cols, null,
        null, null, null, null);

     return c;
 }

 public Cursor queryAll(int nameId) {
     String[] cols = { openHelper_ob.KEY_ID, openHelper_ob.FNAME, openHelper_ob.DESC,
             openHelper_ob.LNAME };
     opnToWrite();
     Cursor c = database_ob.query(openHelper_ob.TABLE_NAME, cols,
             openHelper_ob.KEY_ID + "=" + nameId, null, null, null, null);

  return c;

 }

 public long updateldetail(int rowId, String fname, String desc, String lname) {
      ContentValues contentValues = new ContentValues();
      contentValues.put(openHelper_ob.FNAME, fname);
      contentValues.put(openHelper_ob.DESC, desc);
      contentValues.put(openHelper_ob.LNAME, lname);
      opnToWrite();
      long val = database_ob.update(openHelper_ob.TABLE_NAME, contentValues,
        openHelper_ob.KEY_ID + "=" + rowId, null);
      Close();
      return val;
 }
 public int deletOneRecord(int rowId) {
      // TODO Auto-generated method stub
      opnToWrite();
      int val = database_ob.delete(openHelper_ob.TABLE_NAME,
        openHelper_ob.KEY_ID + "=" + rowId, null);
      Close();
      return val;
     }
 public Cursor GetOneNote(long id) {
        return database_ob.query(openHelper_ob.TABLE_NAME, null, openHelper_ob.KEY_ID + "=" + id, null, null,
                null, null);
    }

}

How can I store it in sd? I've tried using openOrCreateDatabase but it only create the database but inside is empty.