Question

我有以下方法-


public String getTitle() {
    int status = getArguments().getInt(ARGS_CONTESTS_STATUS);
    Context context = getContext();
    if (context != null) {
      switch (status) {
        case ContestUtil.VAL_STATUS_NOT_OPENED:
          return getContext().getResources().getString(R.string.ContestsFragment_Soon);
//        return "Soon";
        case ContestUtil.VAL_STATUS_RUNNING_BEGIN:
          return getContext().getResources().getString(R.string.ContestsFragment_Running);
//        return "Running";
        case ContestUtil.VAL_STATUS_ENDED:
          return getContext().getResources().getString(R.string.ContestsFragment_Winners);
//        return "Ended";
      }
    }
    return "null context";
  }

总是返回“空上下文”。

我的类是一个片段类型，应该返回一个上下文，但是由于某种原因，调用此方法时上下文为null。

调用方法的唯一地方是此类，它扩展了FragmentStatePagerAdapter-


public class ContestsViewPagerAdapter extends FragmentStatePagerAdapter {

  private ArrayList<? extends Fragment> mFragments;


  public ContestsViewPagerAdapter(FragmentManager fm, ArrayList<? extends Fragment> fragments) {
    super(fm);
    mFragments = fragments;
  }



  @Override
  public Fragment getItem(int position) {
    return mFragments.get(position);
  }

  @Override
  public int getCount() {
    return 3;
  }

  @Nullable
  @Override
  public CharSequence getPageTitle(int position) {
    return ((ContestsFragment) mFragments.get(position)).getTitle(); // <- here is the place where my method is being called 
    }

}

Answer 1

在onViewCreated中调用getTitle函数

片段竞赛片段{3fa10a4}未附加到上下文

1 个答案: