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  • RecyclerView - Alternating layouts
    via Stack Overflow by user1754499
    • java.lang.NullPointerException: Attempt to invoke virtual method '$LayoutManager' on a null object reference at com.example.wsdw.MainActivity.onOptionsItemSelected( at at at at at at at at at at at at android.view.View.performClick( at android.view.View$ at android.os.Handler.handleCallback( at android.os.Handler.dispatchMessage( at android.os.Looper.loop( at at java.lang.reflect.Method.invoke(Native Method) at$ at
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