我試圖按照教程如何使用ActionBar選項卡創建可滑動的ViewPager。一切編譯罰款,但是當我嘗試啓動活動,它與此錯誤崩潰: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null o
我有他的課的片段: public class FormatShortFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootVi