java.lang.NullPointerException

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  • RecyclerView crashes
    via by Unknown author,
  • Collapsing Toolbar and Fragment
    via Stack Overflow by user3110815
    ,
    • java.lang.NullPointerException: 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 at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:1764) at android.view.View.measure(View.java:17565) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5537) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17565) at android.widget.ListView.setupChild(ListView.java:1944) at android.widget.ListView.makeAndAddView(ListView.java:1867) at android.widget.ListView.fillDown(ListView.java:698) at android.widget.ListView.fillFromTop(ListView.java:759) at android.widget.ListView.layoutChildren(ListView.java:1659) at android.widget.AbsListView.onLayout(AbsListView.java:2151) at android.view.View.layout(View.java:15689) at android.view.ViewGroup.layout(ViewGroup.java:5040) at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:581)

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