Android-Fragment Shared element transaction ERROR -


i want use fragment shared element transaction in adapter. show detail when pressed read more button cannot this. dunno fault. idea ? 

import android.app.activity; import android.content.context; import android.os.build; import android.support.design.widget.snackbar; import android.support.v4.app.fragmenttransaction; import android.support.v7.widget.recyclerview; import android.transition.transition; import android.transition.transitioninflater; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.view.animation.animation; import android.view.animation.animationutils; import android.widget.textview;  import java.util.list;  /**  * created r00t on 16.12.2015.  */ public class newslistadapter extends     recyclerview.adapter<newslistadapter.viewholder>{ private list<newsmodel> newsmodels; private context context; private int lastposition = -1;  public newslistadapter(context context, list<newsmodel> feeditemlist) {     this.newsmodels = feeditemlist;     this.context = context; } public class viewholder extends recyclerview.viewholder {     protected textview title;     protected textview desc;     protected textview readmore;     public viewholder(view view) {         super(view);         this.title = (textview) view.findviewbyid(r.id.asd);         this.desc = (textview) view.findviewbyid(r.id.desc);         this.readmore = (textview) view.findviewbyid(r.id.readmore);     } } @override public viewholder oncreateviewholder(viewgroup parent, int viewtype) {     view v = layoutinflater.from(parent.getcontext()).inflate(r.layout.news_recyclerlist_item, parent, false);     viewholder view_holder = new viewholder(v);     return view_holder; }  @override public void onbindviewholder(final viewholder holder, final int position) {     setanimation(holder.itemview, position);     holder.title.settext(newsmodels.get(position).gettitle());     holder.desc.settext(newsmodels.get(position).getdesc());     holder.readmore.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             newsfragment newsfragment = new newsfragment();             newsdetailfragment newsdetailfragment = new newsdetailfragment();             if (build.version.sdk_int >= build.version_codes.lollipop) {                 transition changetransform = transitioninflater.from(v.getcontext()).                         inflatetransition(r.transition.change_image_transform);                 transition explodetransform = transitioninflater.from(v.getcontext()).                         inflatetransition(android.r.transition.explode);                  newsfragment.setsharedelementreturntransition(changetransform);                 newsfragment.setexittransition(explodetransform);                  newsdetailfragment.setsharedelemententertransition(changetransform);                 newsdetailfragment.setentertransition(explodetransform);                  textview title = (textview) v.findviewbyid(r.id.asd);                  fragmenttransaction fragmenttransaction = ((activity)context).getfragmentmanager()                         .begintransaction()                         .replace(r.id.flcontent, newsdetailfragment)                         .addtobackstack("s")                         .addsharedelement(title, "dsa");                 fragmenttransaction.commit();             }            }     }); }  @override public int getitemcount() {     return newsmodels.size(); }  @override public void onattachedtorecyclerview(recyclerview recyclerview) {     super.onattachedtorecyclerview(recyclerview); }  private void setanimation(view viewtoanimate, int position) {     if (position > lastposition)     {         animation animation = animationutils.loadanimation(context, android.r.anim.slide_in_left);         viewtoanimate.startanimation(animation);         lastposition = position;     } }  }

and i'm getting error. dunno i'm gonna do.

02-08 16:30:59.565 2755-2755/? e/androidruntime: fatal exception: main                                              process: com.lux.lux, pid: 2755                                              java.lang.nullpointerexception: attempt invoke virtual method 'java.lang.string android.view.view.gettransitionname()' on null object reference                                                  @ android.app.backstackrecord.addsharedelement(backstackrecord.java:565)                                                  @ com.lux.lux.adapters.newslistadapter$1.onclick(newslistadapter.java:79)                                                  @ android.view.view.performclick(view.java:5198)                                                  @ android.view.view$performclick.run(view.java:21147)                                                  @ android.os.handler.handlecallback(handler.java:739)                                                  @ android.os.handler.dispatchmessage(handler.java:95)                                                  @ android.os.looper.loop(looper.java:148)                                                  @ android.app.activitythread.main(activitythread.java:5417)                                                  @ java.lang.reflect.method.invoke(native method)                                                  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726)                                                  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616)


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