Accessing data in sqlite after passing activity.

At first I was displaying all rows from db in MainActivity, later I needed to add detailed view so I passed activity and I can't access database. What I'm doing wrong? How can I get data like I did it in MainActivity?

  public class MainActivity extends Activity {

    public final static String ID_EXTRA="com.example.bazadanych._ID";

    DBAdapter myDB;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        openDB();

        populateListViewDB ();

        onclickcallback();

    }

@Override
    protected void onDestroy() {
        super.onDestroy();
        closeDB();
    }

private void openDB() {
        myDB = new DBAdapter(this);
        myDB.open();

    }

private void closeDB() {
        myDB.close();

}                   
     private void populateListViewDB() {
    Cursor cursor = myDB.getAllRows();

    // aktywnosc bedzie zarzadzala cyklem kursora

    startManagingCursor(cursor);

    //mapowanie dla kursowra dla wyswietlania pol

    String[] fromFieldNames = new String[]
                {DBAdapter.KEY_NAME, DBAdapter.KEY_COUNTRY, DBAdapter.KEY_REGION, DBAdapter.KEY_PHONE};
    int [] toViewIDs = new int []
            {R.id.list_item_name, R.id.list_item_country, R.id.list_item_region, R.id.list_icon_item};


    // stworzenie adaptera dla kolumn
    SimpleCursorAdapter myCursorAdapter = new SimpleCursorAdapter(
            this, //context
            R.layout.main_list_item, // layout wiersza
            cursor,                 //cursor - zestaw rekordow z DB
            fromFieldNames,         // wartosci w DB
            toViewIDs               // wyswietla ID, aby insertowac informacje
            );  


    // ustawianie adaptera do listview
    ListView myList = (ListView) findViewById(R.id.listViewDB);
    myList.setAdapter(myCursorAdapter);

    }

     private void onclickcallback() {
         ListView myList = (ListView) findViewById(R.id.listViewDB);
            myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {


            @Override
            public void onItemClick(AdapterView<?> parent, View viewClicked,
                    int position, long id) {

                Intent intent = new Intent(MainActivity.this, Details.class);
                intent.putExtra(ID_EXTRA, String.valueOf(id));
                startActivity(intent);       

            }

        });
     }
}

ACtivity is passed to Details.class. Eclipse want's me to create method "getWritableDatabase", but it's already in the DBAdapter, what's wrong here?

Details extends Activity {

    DBAdapter myDB;
    String passedV=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.item_layout);

        passedV=getIntent().getStringExtra(MainActivity.ID_EXTRA);
        SQLiteDatabase db = (new DBAdapter(this)).getWritableDatabase();

        openDB();

        populateListViewDB ();



    }

@Override
    protected void onDestroy() {
        super.onDestroy();
        closeDB();
    }



private void openDB() {
        myDB = new DBAdapter(this);
        myDB.open();

    }

private void closeDB() {
        myDB.close();

}

private void populateListViewDB() {
    Cursor cursor = myDB.getRow(0);

        // aktywnosc bedzie zarzadzala cyklem kursora

        startManagingCursor(cursor);

        //mapowanie dla kursowra dla wyswietlania pol

        String[] fromFieldNames = new String[]
                    {DBAdapter.KEY_NAME, DBAdapter.KEY_COUNTRY, DBAdapter.KEY_REGION, DBAdapter.KEY_VC, DBAdapter.KEY_ADRESS, DBAdapter.KEY_PHONENUM, DBAdapter.KEY_PHONE};
        int [] toViewIDs = new int []
                {R.id.item_name, R.id.item_country, R.id.item_region,  R.id.item_vc, R.id.item_adress, R.id.item_phonenum, R.id.list_icon_item};


        // stworzenie adaptera dla kolumn
        SimpleCursorAdapter myCursorAdapter = new SimpleCursorAdapter(
                this, //context
                R.layout.item_layout, // layout wiersza
                cursor,                 //cursor - zestaw rekordow z DB
                fromFieldNames,         // wartosci w DB
                toViewIDs               // wyswietla ID, aby insertowac informacje
                );  


        // ustawianie adaptera do listview
        ListView myList = (ListView) findViewById(R.id.listViewDB);
        myList.setAdapter(myCursorAdapter);


    }
}

This is Database Adapter

public class DBAdapter {


    private static final String TAG = "DBAdapter";

    // DB Fields
    public static final String KEY_ROWID = "_id";
    public static final int COL_ROWID = 0;

    public static final String KEY_NAME = "Name";
    public static final String KEY_COUNTRY = "Country";
    public static final String KEY_REGION = "Region";
    public static final String KEY_VC = "VisitorsCenter";
    public static final String KEY_ADRESS = "Adress";
    public static final String KEY_PHONE = "Phone";
    public static final String KEY_PHONENUM = "PhoneNumber";





    // TODO: Setup your field numbers here (0 = KEY_ROWID, 1=...)
    public static final int COL_NAME = 1;
    public static final int COL_COUNTRY = 2;
    public static final int COL_REGION = 3;
    public static final int COL_VC = 4;
    public static final int COL_ADRESS = 5;
    public static final int COL_PHONE = 6;
    public static final int COL_PHONENUM = 7;


    public static final String[] ALL_KEYS = new String[] {KEY_ROWID, KEY_NAME, KEY_COUNTRY, KEY_REGION, KEY_VC, KEY_ADRESS, KEY_PHONE, KEY_PHONENUM };

    public static final String DATABASE_NAME = "MyDb";
    public static final String DATABASE_TABLE = "mainTable";
    // Track DB version if a new version of your app changes the format.
    public static final int DATABASE_VERSION = 18;  

    private static final String DATABASE_CREATE_SQL = 
            "create table " + DATABASE_TABLE 
            + " (" + KEY_ROWID + " integer primary key autoincrement, "

            + KEY_NAME + " text not null, "
            + KEY_COUNTRY + " string not null, "
            + KEY_REGION + " string not null, "
            + KEY_VC + " string not null, "
            + KEY_ADRESS + " String not null, "
            + KEY_PHONE + " int not null, "
            + KEY_PHONENUM +  " int not null "


            + ");";

    // Context of application who uses us.
    private final Context context;

    private DatabaseHelper myDBHelper;
    private SQLiteDatabase db;

    public DBAdapter(Context ctx) {
        this.context = ctx;
        myDBHelper = new DatabaseHelper(context);
    }

    // Open the database connection.
    public DBAdapter open() {
        db = myDBHelper.getWritableDatabase();
        return this;
    }

    // Close the database connection.
    public void close() {
        myDBHelper.close();
    }

    // Add a new set of values to the database !!!
    public long insertRow(String Name, String Country, String Region, String VisitorsCenter, String Adress, int Phone, int PhoneNumber) {

        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_NAME, Name);
        initialValues.put(KEY_COUNTRY, Country);
        initialValues.put(KEY_REGION, Region);
        initialValues.put(KEY_VC, VisitorsCenter);
        initialValues.put(KEY_ADRESS, Adress);
        initialValues.put(KEY_PHONE, Phone);
        initialValues.put(KEY_PHONENUM, PhoneNumber);

        // Insert it into the database.
        return db.insert(DATABASE_TABLE, null, initialValues);
    }

    // Delete a row from the database, by rowId (primary key)
    public boolean deleteRow(long rowId) {
        String where = KEY_ROWID + "=" + rowId;
        return db.delete(DATABASE_TABLE, where, null) != 0;
    }

    public void deleteAll() {
        Cursor c = getAllRows();
        long rowId = c.getColumnIndexOrThrow(KEY_ROWID);
        if (c.moveToFirst()) {
            do {
                deleteRow(c.getLong((int) rowId));              
            } while (c.moveToNext());
        }
        c.close();
    }

    // Return all data in the database.
    public Cursor getAllRows() {
        String where = null;
        Cursor c =  db.query(true, DATABASE_TABLE, ALL_KEYS, 
                            where, null, null, null, null, null);
        if (c != null) {
            c.moveToFirst();
        }
        return c;
    }

    // Get a specific row (by rowId)
    public Cursor getRow(long rowId) {
        String where = KEY_ROWID + "=" + rowId;
        Cursor c =  db.query(true, DATABASE_TABLE, ALL_KEYS, 
                        where, null, null, null, null, null);
        if (c != null) {
            c.moveToFirst();
        }
        return c;
    }

    // Change an existing row to be equal to new data.
    public boolean updateRow(long rowId, String Name, String Country, String Region, String VisitorsCenter, String Adress, int Phone, int PhoneNumber) {
        String where = KEY_ROWID + "=" + rowId;

        ContentValues newValues = new ContentValues();
        newValues.put(KEY_NAME, Name);
        newValues.put(KEY_COUNTRY, Country);
        newValues.put(KEY_REGION, Region);
        newValues.put(KEY_VC, VisitorsCenter);
        newValues.put(KEY_ADRESS, Adress);
        newValues.put(KEY_PHONE, Phone);
        newValues.put(KEY_PHONENUM, PhoneNumber);

        // Insert it into the database.
        return db.update(DATABASE_TABLE, newValues, where, null) != 0;
    }




    private static class DatabaseHelper extends SQLiteOpenHelper
    {
        DatabaseHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase _db) {
            _db.execSQL(DATABASE_CREATE_SQL);           
        }

        @Override
        public void onUpgrade(SQLiteDatabase _db, int oldVersion, int newVersion) {
            Log.w(TAG, "Upgrading application's database from version " + oldVersion
                    + " to " + newVersion + ", which will destroy all old data!");

            // Destroy old database:
            _db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);

            // Recreate new database:
            onCreate(_db);
        }
    }
}

Thanks in advance for all your help.