public void retrieveList(){
    DataBaseAdapter adapter = new DataBaseAdapter(this);
    db = adapter.getWritableDatabase();
    cursor = db.rawQuery("SELECT * FROM ficha", null);
}

public void createList(){
    listViewF = (ListView) findViewById(R.id.listViewF);
    CursorAdapterList adapter = new CursorAdapterList(this, cursor);
    listViewF.setAdapter(adapter);
}