App crashing when trying to use RecyclerView on android 5 0

Question

I m trying to mess with the new RecyclerView and whenever I try to run it  my app immediately crashes  It gives me NullPointerException for trying to access methods from android support v7 widget RecyclerView  I ve looked at other posts and saw that most people didn t have compile  com android support recyclerview-v7    but I tried that and it hasn t helped at all  Not really sure what to do at this point  any help would be appreciated  Here the error log   I would post a picture but I don t have 10 rep yet   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 17430          at android widget RelativeLayout measureChildHorizontal RelativeLayout java 727          at android widget RelativeLayout onMeasure RelativeLayout java 463          at android view View measure View java 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          at android widget FrameLayout onMeasure FrameLayout java 430          at android view View measure View java 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          at android widget FrameLayout onMeasure FrameLayout java 430          at android view View measure View java 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          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 17430          at android support v4 widget DrawerLayout onMeasure DrawerLayout java 851          at android view View measure View java 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          at android widget FrameLayout onMeasure FrameLayout java 430          at android view View measure View java 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          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 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          at android widget FrameLayout onMeasure FrameLayout java 430          at android view View measure View java 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          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 17430          at android view ViewGroup measureChildWithMargins ViewGroup java 5463          at android widget FrameLayout onMeasure FrameLayout java 430          at com android internal policy impl PhoneWindow DecorView onMeasure PhoneWindow java 2560          at android view View measure View java 17430          at android view ViewRootImpl performMeasure ViewRootImpl java 2001          at android view ViewRootImpl measureHierarchy ViewRootImpl java 1166          at android view ViewRootImpl performTraversals ViewRootImpl java 1372          at android view ViewRootImpl doTraversal ViewRootImpl java 1054          at android view ViewRootImpl TraversalRunnable run ViewRootImpl java 5786          at android view Choreographer CallbackRecord run Choreographer java 767          at android view Choreographer doCallbacks Choreographer java 580          at android view Choreographer doFrame Choreographer java 550          at android view Choreographer FrameDisplayEventReceiver run Choreographer java 753          at android os Handler handleCallback Handler java 739          at android os Handler dispatchMessage Handler java 95          at android os Looper loop Looper java 135          at android app ActivityThread main ActivityThread java 5221          at java lang reflect Method invoke Native Method          at java lang reflect Method invoke Method java 372          at com android internal os ZygoteInit MethodAndArgsCaller run ZygoteInit java 898          at com android internal os ZygoteInit main ZygoteInit java 693

User · Answer

I had this problem when using Butterknife   I was using fragment For Fragment  it should be ButterKnife bind this view   For Activity ButterKnife bind this

User · Answer

In my case it was not connected to  final   but to the issue mentioned in  NemanjaKovacevic comment to  aga answer  I was setting a layoutManager on data load and that was the cause of the same crash   After moving the layoutManager setup to onCreateView of my fragment the issue was fixed   Something like this    Override public View onCreateView LayoutInflater inflater  ViewGroup container                               Bundle savedInstanceState        mRecyclerView    RecyclerView  rootView findViewById R id recycler    mLayoutManager   new StaggeredGridLayoutManager 2 StaggeredGridLayoutManager VERTICAL   mRecyclerView setLayoutManager mLayoutManager

User · Answer

This issue usually occurs when no LayoutManager was provided for the RecyclerView  You can do it like so     final LinearLayoutManager layoutManager   new LinearLayoutManager context   layoutManager setOrientation LinearLayoutManager VERTICAL   recyclerView setLayoutManager layoutManager

User · Answer

I faced the same issue cause I had the RecyclerView in another layout and not on activity main xml   By searching on some sites I got something and felt like sharing here   Add Id to Include tag in Activity main xml   lt include id  includedRecyclerLayout        lt  include gt  call this layout before Searching view by ID in MainActivity java   ConstraintLayout includedLayout   findViewById R id inckudedRecyclerLayout    RecyclerViewrecyclerview includedLayout findViewById R id RECYCLER VIEW ID

User · Answer

If I where you I will do this  onView withId android R id list   perform RecyclerViewActions scrollToPosition 3    android R id list change it to your list id and position will be your position inside your array

User · Answer

using fragment   writing code in onCreateView    RecyclerView recyVideo   view findViewById R id recyVideoFag       using activity   writing code in onCreate   RecyclerView recyVideo   findViewById R id recyVideoFag

User · Answer

For those who are using  implementation  androidx recyclerview recyclerview 1 1 0-beta05   make sure you are using this in your xml layout   I also experienced a crash when running my app below API 27  Here s a link to the message  Originally  I have created a style to change the font size of my textview inside the recyclerview that s why I created this code below   I could have just called  dimen when changing the font size based on screen sizes   Inside style xml  and added this in my theme   themes xml  After investigating  I found out that this is the one causing me an error and after removing the style  I no longer experiencing a crash   I tried all the possible solutions I found here in stack overflow and almost gave up on this  thankfully in my curiosity I thought why not removing the style maybe this causes the crash and then boom the crash is gone

User · Answer

recyclerView                RecyclerView  findViewById R id recycler view2     Check with you recycler view ID  pointing to actual recycler view solved my issue

User · Answer

Since LinearLayoutManager is vertical by default  an easier way to do this is   recyclerView setLayoutManager new LinearLayoutManager context     If you want to change the orientation you could use this constructor   public LinearLayoutManager Context context  int orientation  boolean reverseLayout

User · Answer

For me the problem was with my activity main xml 21  in which the recycleView didn t have an id   activity main xml 21     lt android support v7 widget RecyclerView     android layout width  0dp      android layout height  wrap content      android layout marginStart  8dp      android layout marginLeft  8dp      android layout marginTop  8dp      android layout marginEnd  8dp      android layout marginRight  8dp      app layout constraintEnd toEndOf  parent      app layout constraintHorizontal bias  0 0      app layout constraintStart toStartOf  parent      app layout constraintTop toBottomOf    id button3      tools listitem   layout transaction list row    gt    activity main xml   lt android support v7 widget RecyclerView      android id    id transac recycler view      android layout width  0dp      android layout height  wrap content      android layout marginStart  8dp      android layout marginLeft  8dp      android layout marginTop  8dp      android layout marginEnd  8dp      android layout marginRight  8dp      app layout constraintEnd toEndOf  parent      app layout constraintHorizontal bias  0 0      app layout constraintStart toStartOf  parent      app layout constraintTop toBottomOf    id button3        gt    It worked when i added a  android id    id transac recycler view  to the activity main xml 21  recycleView

User · Answer

I got this issue due to wrong reference of RecyclerView id   recyclerView    RecyclerView  findViewById R id rv followers list     to  recyclerView    RecyclerView  findViewById R id rv search list

User · Answer

In my case  I added only butterknife library and forget to add annotationProcessor  By adding below line to build gradle  App module   solved my problem       annotationProcessor  com jakewharton butterknife-compiler 10 1 0

User · Answer

I was using a Dependency Injection - ButterKnife and this problem arised because I had not binded the view   So inside onCreate   I just inserted this line   ButterKnife bind this     My RecyclerView declaration with Dependency Injection    BindView R id recyclerview  RecyclerView recyclerView

User · Answer

In Gradle implement this library     implementation  com android support appcompat-v7 SDK VER  implementation  com android support design SDK VER  implementation  com android support support-v4 SDK VER  implementation  com android support support-v13 SDK VER  implementation  com android support recyclerview-v7 SDK VER    In XML mention like this      lt android support v7 widget RecyclerView   android layout width  match parent    android layout height  wrap content    android id    id recyclerView   gt    In Fragment we use recyclerView like this     Override     public View onCreateView LayoutInflater inflater  ViewGroup container                               Bundle savedInstanceState               Inflate the layout for this fragment        View rootView   inflater inflate R layout YOUR LAYOUT NAME  container  false           RecyclerView recyclerView    RecyclerView  rootView findViewById R id recyclerView           RecyclerView LayoutManager layoutManager   new LinearLayoutManager getActivity    LinearLayoutManager VERTICAL  false           recyclerView setLayoutManager layoutManager           APICallMethod            YOURADAPTER   new YOURADAPTER getActivity    YOUR LIST      you can use that adapter after for loop in response APICALLMETHOD          recyclerView setAdapter YOURADAPTER           return rootView          In Activity we use RecyclerView like this     Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout YOUR LAYOUT NAME            RecyclerView recyclerView    RecyclerView  findViewById R id recyclerView           RecyclerView LayoutManager layoutManager   new LinearLayoutManager getActivity    LinearLayoutManager VERTICAL  false           recyclerView setLayoutManager layoutManager           APICallMethod            YOURADAPTER   new YOURADAPTER ACTIVITY NAME this  YOUR LIST      you can use that adapter after for loop in response APICALLMETHOD          recyclerView setAdapter YOURADAPTER          if you need horizontal RecyclerView do this    RecyclerView recyclerView    RecyclerView  findViewById R id recyclerView           RecyclerView LayoutManager layoutManager   new LinearLayoutManager getActivity    LinearLayoutManager HORIZONTAL  false           recyclerView setLayoutManager layoutManager           APICallMethod            YOURADAPTER   new YOURADAPTER ACTIVITY NAME this  YOUR LIST      you can use that adapter after for loop in response APICALLMETHOD          recyclerView setAdapter YOURADAPTER     if you want to use GridLayoutManager using RecyclerView use like this            RecyclerView recyclerView   findViewById R id rvNumbers           recyclerView setLayoutManager new GridLayoutManager this  3       3 is number of columns          adapter   new MyRecyclerViewAdapter this  data           recyclerView setAdapter adapter

User · Answer

You need to use setLayoutManager in the RecyclerView onCreate   method  Before adding recyclerView to a view  it must have the LayoutManager set    private RecyclerView menuAsList    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity home        menuAsList    RecyclerView  findViewById R id recyclerView mainMenu       menuAsList setLayoutManager new LinearLayoutManager Home this

User · Answer

I think the problem in your Adapter  Make sure you have returned ViewHolder in onCreateViewHolder    Like below    Override public ViewHolder onCreateViewHolder ViewGroup parent  int viewType        View v      v   LayoutInflater from parent getContext    inflate R layout layout leaderboard  parent  false       ViewHolder view holder   new ViewHolder v       return view holder

User · Answer

My problem was in my XML lyout I have  an android animateLayoutChanges set to true and I ve called notifyDataSetChanged   on the RecyclerView s adapter in the Java code   So  I ve just removed android animateLayoutChanges from my layout and that resloved my problem

User · Answer

For me  I was having the same issue  the issue was that there was an unused RecyclerView in xml with view gone but I am not binding it to any adapter in Activity  hence the issue  It was solved as soon as I removed such unused recycler views in xml  i e - I removed this view as this was not called in code or any adapter has been set   lt android support v7 widget RecyclerView         android layout width  match parent          android layout height  match parent          android id    id rv profileview allactivities          android visibility  gone    gt

User · Answer

I experienced this crash even though I had the RecyclerView LayoutManager properly set  I had to move the RecyclerView  initialization code into the onViewCreated      callback to fix this issue    Override public View onCreateView LayoutInflater inflater  ViewGroup container                           Bundle savedInstanceState        View rootView   inflater inflate R layout fragment listing  container  false       rootView setTag TAG       return inflater inflate R layout fragment listing  container  false       Override public void onViewCreated View view  Bundle savedInstanceState        super onViewCreated view  savedInstanceState        mLayoutManager   new LinearLayoutManager getActivity         mLayoutManager setOrientation LinearLayoutManager VERTICAL        mRecyclerView    RecyclerView  view findViewById R id recyclerView       mRecyclerView setItemAnimator new DefaultItemAnimator         mRecyclerView setLayoutManager mLayoutManager        mAdapter   new ListingAdapter mListing       mRecyclerView setAdapter mAdapter

User · Answer

I had this problem when using Butterknife library  I had   View rootView   inflater inflate                  R layout fragment recipe detail view  container  false   ButterKnife bind rootView     But the correct version is   View rootView   inflater inflate                  R layout fragment recipe detail view  container  false   ButterKnife bind this  rootView

User · Answer

Recyclerview recylerview   findbyid R id recyclerview   May be you have missed it

User · Answer

I had similar problem when I test my application on GenyMotion  After restart the device in GenyMotion problem was solved

[java] App crashing when trying to use RecyclerView on android 5.0

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