Question

在我的应用程序中，我有一些片段。在它们的布局中，我放置了一些元素，但是找不到如何初始化以下元素。我也知道这种方式：

element = view.findViewById(R.id.element);

但是我有一些函数需要初始化以下元素：

public class Received extends Fragment {

    private OnFragmentInteractionListener mListener;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_received, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        received();
    }

    public void received() {
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://my_server/")
                .client(client)
                .addConverterFactory(GsonConverterFactory.create())
                .build();


        String access_token = "token";
        final APIService mAPIService = retrofit.create(APIService.class);
        mAPIService.getInMess("Bearer "+access_token,0, 1).enqueue(new Callback<ListOfMess>() {

            @Override
            public void onResponse(@NonNull Call<ListOfMess> call, @NonNull Response<ListOfMess> response) {
                if (response.isSuccessful()) {

                }
            }

            @Override
            public void onFailure(@NonNull Call<ListOfMess> call, @NonNull Throwable t) {

            }
        });
    }


    /*private String getTokenFromShared(){
        return getSharedPreferences(Constants.SP_NAME, MODE_PRIVATE).getString(Constants.SP_ACCESS_TOKEN, "");
    }*/

    public void fillList()
    {

    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

我必须在函数中初始化我的元素，我尝试了 view.findviewbyid ，只有 findViewbyId ，但是没有任何效果，android studio找不到这些元素。希望您能解决以下问题。

Answer 1

在Fragments中，您需要使用onCreateView方法初始化视图，就像这样：

View element;    

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_observations_list, container, false);
    element = view.findViewById(R.id.element);
    return view;
}

在片段Android上初始化视图元素

1 个答案: