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在 fragment 里面调用 findViewById

public class CompanyListFragment  extends Fragment {

  private Activity activity;
    private ListView companyListView;

  @Override
  public View onCreateView(LayoutInflater infalter, ViewGroup container, Bundle savedInstanceState) {
    View view = infalter.inflate(R.layout.companylist_for_sport, container, false);
    companyListView = (ListView)view.findViewById(R.id.companyListView);
    return view;
  }

}

注意1:  是在 onCreateView 中

注意2:  是 view.findViewById 而不是 activity.findViewById

在 fragment 里面调用 findViewById