cymcsg/UltimateRecyclerView

java.lang.NullPointerException: Attempt to write to field 'int android.support.v7.widget.RecyclerView$ViewHolder.mItemViewType' on a null object

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#372 opened on May 5, 2016

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at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5465) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4689) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4599) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1988) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1384) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1347) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.LinearLayoutManager.scrollBy(LinearLayoutManager.java:1174) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.LinearLayoutManager.scrollVerticallyBy(LinearLayoutManager.java:1031) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.RecyclerView.scrollByInternal(RecyclerView.java:1504) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.widget.RecyclerView.onTouchEvent(RecyclerView.java:2461) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.View.dispatchTouchEvent(View.java:9295) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2547) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2240) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1737) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.app.Activity.dispatchTouchEvent(Activity.java:2799) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.View.dispatchPointerEvent(View.java:9515) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4230) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4096) 05-05 15:13:41.388 20154-20154/com.softinfo.zdl.smartPhone E/AndroidRuntime: at android.view.ViewRootImpl$InputStage

Contributor guide

Tech stack
java
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
unclear
Prerequisites
Android developmentJavaRecyclerView basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Examine the stack trace to identify where the ViewHolder is null. Look at the adapter's onCreateViewHolder() and getItemViewType() implementations. Check the comments for any reproduction steps. Consider adding null checks or ensuring view type is set before binding.