我有getWritableDatabase()的一個問題NullPointerException異常的NullPointerException上getWritableDatabase()
public class DatabaseTable extends Activity {
private Context context;
@Override
public void onCreate(Bundle savedInstanceState) {
LBD conection = LBD.get(this);
super.onCreate(savedInstanceState);
}
}
有一個實現不起作用 「openHelper.getWritableDatabase()」
public class LBD {
private Context context;
private static SQLiteDatabase db;
private OpenHelper openHelper;
public static LBD get(Context context) {
LBD lbd = new LBD(context);
lbd.open();
return lbd;
}
public LBD(Context c) {
context = c;
}
final public void open() {
openHelper = new OpenHelper(context);
db = openHelper.getWritableDatabase();
}
public class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) {
super(context, "rss_base.db", null, 3);
}
}
}
我意識到,我忘了給的onCreate初始化感謝大家
你可以發佈完整的堆棧跟蹤和多一點你的代碼? – Dahaka 2012-08-10 07:47:07
請發佈OpenHelper類的代碼 – 2012-08-10 08:04:27
已添加OpenHelper類 – 2012-08-10 08:08:18