Cause for NullPointerException android.support.v7.widget.RecyclerView.onMeasure

Question

I am getting following Exception

01-27 11:15:15.756  18348-18348/com.example.pnimje.newswipelistview E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:1764)
            at android.view.View.measure(View.java:15848)
            at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
            at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905)
            at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
            at android.view.Choreographer.doCallbacks(Choreographer.java:562)
            at android.view.Choreographer.doFrame(Choreographer.java:532)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
            at android.os.Handler.handleCallback(Handler.java:730)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)

and RecyclerView.java:1764 is

    mLayout.onMeasure(mRecycler, mState, widthSpec, heightSpec);

Why is mLayout (LayoutManager) null?

I'm guessing because somewhere along the line, it got set to null or was never not null. You're going to need to show more code than that. — iheanyi, Jan 27 '15 at 22:56
for anyone who has this error caused by Viewpager tabs see this [solution](http://stackoverflow.com/a/34500413/2977976) — Hassan Gilak, Dec 28 '15 at 20:38

Anton Savenok · Accepted Answer · 2015-02-18T08:05:10.517

56

because you have not set LinearLayoutManager to RecyclerView.

for example:

    mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    LinearLayoutManager layoutManager = new LinearLayoutManager(context);
    mRecyclerView.setLayoutManager(layoutManager);
    mRecyclerView.setAdapter(new CustomAdapter());

edited Feb 18 '15 at 08:05

answered Feb 13 '15 at 04:10

Anton Savenok

875
8
10

into fragment - new LinearLayoutManager(getActivity) – Anton Savenok Jul 23 '15 at 12:06

score 3 · Answer 2 · answered Mar 12 '15 at 16:23

These kinds of errors usually originate in not setting the RecyclerView's layout manager. Bein' in a hurry myself I forgot to set one which ended in the following error:

java.lang.NullPointerException
        at android.support.v7.widget.RecyclerView.onInterceptTouchEvent(RecyclerView.java:1636)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1820)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878)

The following line should resolve it:

mRecyclerView.setLayoutManager(new LinearLayoutManager((Activity)this));

score 0 · Answer 3 · answered Aug 14 '15 at 16:49

Antón response is good but can be confusing in beginners like me, talves this serves to clarify some doubts.

RecyclerView rv;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_buscar);

    rv = (RecyclerView) findViewById(R.id.RecViewTest);
    LinearLayoutManager llm = new LinearLayoutManager(this);
    rv.setLayoutManager(llm);


}

score 0 · Answer 4 · edited Mar 11 '16 at 20:01

0

You need to verify that what you are sending to the adapter is not an empty List<Type>. I recommend you to either create the RecyclerView by code and add it later when you have the information, or to put an empty NULL object before passing it to the constructor of the adapter.

edited Mar 11 '16 at 20:01

Gabriel's Messanger

3,213
17
31

answered Mar 11 '16 at 18:45

Isaac Urbina

1,295
11
21

Cause for NullPointerException android.support.v7.widget.RecyclerView.onMeasure

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