Android RecyclerView LayoutManager Exception

Question

Hi I'm having an issue with the new Android Lollipop RecyclerView

It keeps crashing with the following exception:

Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView$LayoutManager.onMeasure(android.support.v7.widget.RecyclerView$Recycler, android.support.v7.widget.RecyclerView$State, int, int)' on a null object reference

Full stack trace can found here

The code used to initiate the RecyclerView is the same mostly the same as the tutorial, however for some reason this still complains. Any help would be greatly appreciated.

The code can be accessed at: gist here and layout: this gist

None of the views, or objects are null

Answer 1

Add the following code:

    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(layoutManager);

Before adding adapter:

recyclerView.setAdapter(adapter);

Answer 2

In the android Api level 22 it will not give the error. Instead it skips the layout if the Adapter is not found.

By showing the warning:

RecyclerView﹕ No adapter attached; skipping layout

But your app will not crash and runs, but recyclerView doesn't shown.