android - Drag and Drop not working in Fragment -


the code working in activity, not in fragment. can see elements there, can't drag , drop them, stops in long click.

can provide solution?

error log:

*e/androidruntime: fatal exception: main                                                    process: com.example.future.buildingautomationsystem, pid: 10526           java.lang.nullpointerexception          @ com.example.future.buildingautomationsystem.slidefragment.onitemlongclick(slidefragment.java:179)          @ android.widget.abslistview.performlongpress(abslistview.java:3175)          @ android.widget.abslistview$checkforlongpress.run(abslistview.java:3124)          @ android.os.handler.handlecallback(handler.java:808)          @ android.os.handler.dispatchmessage(handler.java:103)          @ android.os.looper.loop(looper.java:193)          @ android.app.activitythread.main(activitythread.java:5395)          @ java.lang.reflect.method.invokenative(native method)          @ java.lang.reflect.method.invoke(method.java:515)          @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:837)          @ com.android.internal.os.zygoteinit.main(zygoteinit.java:653)          @ dalvik.system.nativestart.main(native method)*

code:

import java.util.arraylist;  import android.app.activity; import android.app.fragment; import android.content.clipdata; import android.content.clipdescription; import android.os.bundle; import android.os.handler; import android.view.dragevent; import android.view.layoutinflater; import android.view.menu; import android.view.view; import android.view.view.ondraglistener; import android.view.view.onlongclicklistener; import android.view.viewgroup; import android.widget.adapterview; import android.widget.adapterview.onitemlongclicklistener; import android.widget.baseadapter; import android.widget.gridview; import android.widget.imageview;  public class slidefragment extends fragment implements ondraglistener,         onitemlongclicklistener {      arraylist drawables;      private baseadapter adapter;     private int draggedindex = -1;      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         // todo auto-generated method stub         view v;         v = inflater.inflate(r.layout.slidefragment, container,false);         super.oncreate(savedinstancestate);          drawables = new arraylist();         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         drawables.add(r.drawable.ico1);         gridview gridview = (gridview) v.findviewbyid(r.id.grid_view);         gridview.setonitemlongclicklistener(slidefragment.this);         gridview.setadapter(adapter = new baseadapter() {              @override             // view displays data @ specified position in             // data set.             public view getview(int position, view convertview,                                 viewgroup gridview) {                 // try reuse views.                 imageview view = (imageview) convertview;                 // if convert view null create new instance else reuse                 //                 if (view == null) {                     view = new imageview(getactivity().getbasecontext());                 }                 view.setimageresource((integer) drawables.get(position));                 view.settag(string.valueof(position));                 return view;             }              @override             // row id associated specified position in             // list.             public long getitemid(int position) {                 return position;             }              @override             // data item associated specified position in             // data set.             public object getitem(int position) {                 return drawables.get(position);             }              @override             // how many items in data set represented adapter.             public int getcount() {                 return drawables.size();             }         });         return v;     }     // @override   //  public boolean oncreateoptionsmenu(menu menu) {      // getmenuinflater().inflate(r.menu.menu_login,getview().menu);      //   return true;     //}      @override     public boolean ondrag(final view view, dragevent dragevent) {         switch (dragevent.getaction()) {             case dragevent.action_drag_started:                 // drag has started                 // if called trash resize view , return true                 if (view.getid() == r.id.droplayout) {                     view.animate().scalex(1.0f);                     view.animate().scaley(1.0f);                     return true;                 } else // else check mime type , set view visibility                     if (dragevent.getclipdescription().hasmimetype(                             clipdescription.mimetype_text_plain)) {                         view.setvisibility(view.gone);                         return true;                      } else {                         return false;                     }             case dragevent.action_drag_entered:                 // drag has entered view bounds                 // if called trash can scale it.                 if (view.getid() == r.id.droplayout) {                     view.animate().scalex(1.5f);                     view.animate().scaley(1.5f);                 }                 return true;             case dragevent.action_drag_exited:                 // drag exited view bounds                 // if called trash can reset it.                 if (view.getid() == r.id.droplayout) {                     view.animate().scalex(1.0f);                     view.animate().scaley(1.0f);                 }                 view.invalidate();                 return true;             case dragevent.action_drag_location:                 // ignore event                 return true;             case dragevent.action_drop:                 // dropped inside view bounds                 // if called trash can delete item , reload grid                 // view                 if (view.getid() == r.id.droplayout) {                     drawables.remove(draggedindex);                     draggedindex = -1;                 }                 adapter.notifydatasetchanged();             case dragevent.action_drag_ended:                 // hide trash can                 new handler().postdelayed(new runnable() {                      @override                     public void run() {                        view. findviewbyid(r.id.droplayout).setvisibility(view.gone);                      }                 }, 1000l);                 if (view.getid() == r.id.droplayout) {                     view.animate().scalex(1.0f);                     view.animate().scaley(1.0f);                 } else {                     view.setvisibility(view.visible);                 }                 // remove drag listeners                 view.setondraglistener(null);                 return true;          }         return false;     }      @override     public boolean onitemlongclick(adapterview gridview, view view,                                    int position, long row) {         clipdata.item item = new clipdata.item((string) view.gettag());         clipdata clipdata = new clipdata((charsequence) view.gettag(),                 new string[] { clipdescription.mimetype_text_plain }, item);         view.startdrag(clipdata, new view.dragshadowbuilder(view), null, 0);         view trashcan = view.findviewbyid(r.id.linearlayoutbottom);         trashcan.setvisibility(view.visible);         trashcan.setondraglistener(slidefragment.this);          trashcan.setondraglistener(slidefragment.this);         draggedindex = position;         return true;     }      public layoutinflater getmenuinflater() {         return getmenuinflater();     } }


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