Recycler View 在 Fragment 中不起作用

Question

我一直在制作一个在 Fragment 中使用 recyclerView 的应用程序，但 recyclerView 的内容没有显示出来。它显示：

 'No adapter attached; skipping layout'.

特色助手Class：

public class FeaturedHelperClass {

    int image;
    String title;

    public FeaturedHelperClass(int image, String title) {
        this.image = image;
        this.title = title;
    }

    public int getImage() {
        return image;
    }

    public String getTitle() {
        return title;
    }
}

片段：

RecyclerView.Adapter adapter;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        featuredRecycle = inflater.inflate(R.layout.fragment_dashboard, container, false).findViewById(R.id.explore_recycle);
        recycle();
        return inflater.inflate(R.layout.fragment_dashboard, container, false);
    }

private void recycle(){

        featuredRecycle.setHasFixedSize(true);
        featuredRecycle.setLayoutManager(new LinearLayoutManager(getActivity()));

        ArrayList<FeaturedHelperClass> featuredLocations = new ArrayList<>();

        featuredLocations.add(new FeaturedHelperClass(R.drawable.mcdonald, "Mcdonald's"));
        featuredLocations.add(new FeaturedHelperClass(R.drawable.kfc, "KFC"));
        featuredLocations.add(new FeaturedHelperClass(R.drawable.starbucks, "Starbucks"));

        adapter = new FeaturedAdapter(featuredLocations);
        featuredRecycle.setAdapter(adapter);
    }

Answer 1

您的 inflation 逻辑似乎有问题，请尝试更改 onCreateView

中的以下内容

featuredRecycle = inflater.inflate(R.layout.fragment_dashboard, container, false).findViewById(R.id.explore_recycle);
recycle();
return inflater.inflate(R.layout.fragment_dashboard, container, false);

进入

View view = inflater.inflate(R.layout.fragment_dashboard, container, false);
featuredRecycle = view.findViewById(R.id.explore_recycle);
recycle();
return view;

Answer 2

下面的方法对您有用，但延迟片段中视图的 inflation 并不是一个好方法。由于您在返回视图之前正在执行一些任务，因此它会延迟视图 inflation.

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

执行以下操作是最佳方法，

//inflate the view and return
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.fragment_dashboard, container, false);
         return view;
   }

//this callback is just after the view inflation, you set your ui here
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
             featuredRecycle = view.findViewById(R.id.explore_recycle);
             recycle()
   }

Answer 3

未附加视图 inflation 回收器视图适配器后 'No adapter attached; skipping layout'. 的原因。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        featuredRecycle = inflater.inflate(R.layout.fragment_dashboard, container, false).findViewById(R.id.explore_recycle);
        recycle();
        return inflater.inflate(R.layout.fragment_dashboard, container, false);
    }

因为recycle()方法会在view的inflation之前执行。

我们可以把它改成

//inflate the view and return
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.fragment_dashboard, container, false);
         return view;
   }

//this callback is just after once the view get inflated in the screen
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
             featuredRecycle = view.findViewById(R.id.explore_recycle);
             recycle();
   }

现在我们得到 featuredRecycle 视图并且将执行 recycle() 逻辑，将绘制回收器。

Recycler View 在 Fragment 中不起作用

Recycler View Does not works in Fragment

android

fragment

android-fragments

android-recyclerview