另一种替代方法是:

你可以使用以下方法获取上下文:

getActivity().getApplicationContext();

在kotlin中只使用activity而不是getActivity()

您可以使用getActivity()方法来获取上下文或 您可以使用getContext()方法。

View root = inflater.inflate(R.layout.fragment_slideshow, container, false);
Context c = root.getContext();

我希望这能有所帮助!

最简单和最精确的方法来获得片段的上下文，我发现是直接从ViewGroup当你调用onCreateView方法，至少在这里你肯定不会得到空getActivity():

public class Animal extends Fragment { 
  Context thiscontext;
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
  {
    thiscontext = container.getContext();

要做到如上的答案，你可以重写fragment的onAttach方法:

public static class DummySectionFragment extends Fragment{
...
    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        DBHelper = new DatabaseHelper(activity);
    }
}

public class MenuFragment extends Fragment implements View.OnClickListener {
    private Context mContext;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        FragmentMenuBinding binding=FragmentMenuBinding.inflate(inflater,container,false);
        View view=binding.getRoot();
        mContext=view.getContext();
        return view;
    }
}