OnClick of Expandable null pointer exception

[nilesh211]

02-23 18:01:36.599 16278-16278/ E/AndroidRuntime: FATAL EXCEPTION: main java.lang.NullPointerException at android.support.v7.widget.SimpleItemAnimator.animateChange(SimpleItemAnimator.java:130) at android.support.v7.widget.RecyclerView.animateChange(RecyclerView.java:3062) at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2924) at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1627) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1677) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1531) at android.widget.LinearLayout.onLayout(LinearLayout.java:1440) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1043) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.widget.FrameLayout.onLayout(FrameLayout.java:448) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1677) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1531) at android.widget.LinearLayout.onLayout(LinearLayout.java:1440) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.widget.FrameLayout.onLayout(FrameLayout.java:448) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1677) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1531) at android.widget.LinearLayout.onLayout(LinearLayout.java:1440) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.widget.FrameLayout.onLayout(FrameLayout.java:448) at android.view.View.layout(View.java:15221) at android.view.ViewGroup.layout(ViewGroup.java:4793) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2260) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2007) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1249) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6364) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791) at android.view.Choreographer.doCallbacks(Choreographer.java:591) at android.view.Choreographer.doFrame(Choreographer.java:561) at android.view.Choreographer$FrameHandler.handleMessage(Choreographer.java:693) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5455) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003) at dalvik.system.NativeStart.main(Native Method)

[nilesh211]

Following is my build gradle- ` compileSdkVersion 23 buildToolsVersion "23.0.2" defaultConfig { applicationId "com.xxx.xxx" minSdkVersion 16 targetSdkVersion 23 versionCode 1 versionName "1.0.10" signingConfig signingConfigs.config }

dependencies { compile fileTree(include: ['*.jar'], dir: 'libs') compile 'com.mcxiaoke.volley:library:1.0.19' compile 'com.googlecode.libphonenumber:libphonenumber:7.0.9' compile 'com.pkmmte.view:circularimageview:1.1' compile 'com.android.support:recyclerview-v7:23.1.1' compile 'com.google.android.gms:play-services:7.3.0' compile 'com.tuenti.smsradar:library:1.0.4' compile 'com.android.support:appcompat-v7:23.1.1' compile 'com.melnykov:floatingactionbutton:1.3.0' compile 'com.android.support:cardview-v7:23.1.1' compile 'com.google.maps.android:android-maps-utils:0.4' compile('com.h6ah4i.android.widget.advrecyclerview:advrecyclerview:0.8.6@aar') { transitive = true } compile 'com.commit451:PhotoView:1.2.4' } `

[h6ah4i]

Hi. It looks your adapter does not implement getGroupId() and getChildId() methods properly. These methods need to return unique and stable values. Also, do not forget calling setHasStableIds(true) in the constructor of your adapter.

---

• getGroupId()
  • stable and unique value within all groups, less than or equal to 2^31 - 1
• getChildId()
  • stable and unique value within the same group, less than or equal to 2^32 - 1

[nilesh211]

Thanks .. Appreciate your response... In my Adapter setHasStableIds(true) was set, and i have implemented getGroupId() and getChildID()

@Override public long getGroupId(int groupPosition) { return mProvider.getGroupItem(groupPosition).getGroupId(); }

@Override
public long getChildId(int groupPosition, int childPosition) {
    return mProvider.getChildItem(groupPosition, childPosition).getChildId();
}

but still it's crashing. It is working for everything, except a case where 6 child items are there.