Fragments 中的 Recyclerview，跳过未附加适配器的布局

Question

我正在尝试设置 Recyclerview，但在 initRecycleView() 上不断收到错误消息，显示没有附加适配器跳过布局。

我试过为 RecyclerView 调用一个新的构造函数

RecyclerView recyclerView = new RecyclerView(getContext());

这将导致跳过布局，但如果我删除它并尝试这个

RecyclerView recyclerView = getView().findViewById(R.id.recyclerView);

这将导致调用虚方法空对象引用

public class HomeFragment extends Fragment {

    private static final String TAG = "HomeFragment";

    //Vars
    private ArrayList<String> mImage = new ArrayList<>();
    private ArrayList<String> mTitle = new ArrayList<>();
    private ArrayList<String> mDesc = new ArrayList<>();

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        Log.d(TAG, "onCreateView: started");

        initBitmapImages();
        return inflater.inflate(R.layout.fragment_home, container, false);
    }

    private void initBitmapImages(){
        Log.d(TAG, "initBitmapImages: preparing bitmaps");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 1");
        mDesc.add("This is foto 1");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 2");
        mDesc.add("This is foto 2");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 3");
        mDesc.add("This is foto 3");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 4");
        mDesc.add("This is foto 4");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 5");
        mDesc.add("This is foto 5");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 6");
        mDesc.add("This is foto 6");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 7");
        mDesc.add("This is foto 7");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 8");
        mDesc.add("This is foto 8");

        initRecyclerView();
    }

    private void initRecyclerView(){
        Log.d(TAG, "initRecyclerView: init recyclerView");

         RecyclerView recyclerView = getView().findViewById(R.id.recyclerView);
        RecyclerViewAdapter adapter = new RecyclerViewAdapter(mImage,mTitle,mDesc,getContext());
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
    }
}

我期望的实际输出是在布局中我可以输出我创建的回收视图:(

Answer 1

试试这个可能会有帮助

public class HomeFragment extends Fragment {

    private static final String TAG = "HomeFragment";

    //Vars
    private ArrayList<String> mImage = new ArrayList<>();
    private ArrayList<String> mTitle = new ArrayList<>();
    private ArrayList<String> mDesc = new ArrayList<>();

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        // initialize container view
        View view = inflater.inflate(R.layout.fragment_home, container, false);

        // pass container view to bitmap images so that will use to initialize recyclerView
        initBitmapImages(view);

        return view;
    }



    private void initBitmapImages(View view){
        Log.d(TAG, "initBitmapImages: preparing bitmaps");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 1");
        mDesc.add("This is foto 1");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 2");
        mDesc.add("This is foto 2");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 3");
        mDesc.add("This is foto 3");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 4");
        mDesc.add("This is foto 4");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 5");
        mDesc.add("This is foto 5");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 6");
        mDesc.add("This is foto 6");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 7");
        mDesc.add("This is foto 7");

        mImage.add("https://i.redd.it/j6myfqglup501.jpg");
        mTitle.add("Foto 8");
        mDesc.add("This is foto 8");

        // container view uses to initialize recycle view
        initRecyclerView(view);
    }
    private void initRecyclerView(View view){
        Log.d(TAG, "initRecyclerView: init recyclerView");

        // Initialize recycle view which exist in parent container view so it found and initialize 
        RecyclerView recyclerView = view.findViewById(R.id.recyclerView);
        RecyclerViewAdapter adapter = new RecyclerViewAdapter(mImage,mTitle,mDesc,getContext());
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
    }
}

Fragments 中的 Recyclerview，跳过未附加适配器的布局

Recyclerview in Fragments, skipping layout no adapter attached

java

android

android-recyclerview

android-studio-3.0