我试图按照教程如何使用ActionBar选项卡创建可滑动的ViewPager。一切编译罚款,但是当我尝试启动活动,它与此错误崩溃: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null o
我有他的课的片段: public class FormatShortFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootVi