"recyclerview.sethasfixedsize(boolean)' On A Null Object Reference" Recyclerview Into Fragment

I've a tabbed activity, I want to show in the first fragment (Tab1History) a Recyclerview and Cardview. I've created a XML file for CardView, and in the fragment XML I've insert th

Solution 1:

Change this line :

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

To this:

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

Also, you are using the same layout for your RecyclerView.Adapter and your Fragment in this line:

ViewrootView= inflater.inflate(R.layout.cespite_card_view, container, false);

You should have a layout file for your fragment that contains your RecyclerView widget inside it, like this:

<android.support.v7.widget.RecyclerView
 android:id="@+id/recyclerView"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="#e9e9e9 />

Solution 2:

Change getView() into rootView

getView - Get the root view for the fragment's layout (the one returned by onCreateView(LayoutInflater, ViewGroup, Bundle)), if provided.

@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState)
{
    ViewrootView= inflater.inflate(R.layout.cespite_card_view, container, false);

    recyclerView = (RecyclerView) rootView.findViewById(R.id.RecyclerView);
    recyclerView.setHasFixedSize(true);//every item of the RecyclerView has a fix size
    recyclerView.setLayoutManager(newLinearLayoutManager(getContext()));

    cespiteOggList = newArrayList<>();

    for(int i=0; i<=10; i++)
    {
        CespiteOggcespiteOgg=newCespiteOgg("heading"+(i+1), "Lorem ipsum", date, "sdjijsad", "jdkjd");

        cespiteOggList.add(cespiteOgg);

    }

    adapter = newCespiteAdapter(cespiteOggList, getContext());

    recyclerView.setAdapter(adapter);

            return rootView;
}

Solution 3:

You should find your view from inflated view. Use:

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

instead of:

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

Good luck.