java - Why does ListView object return null every time? -

i tried fill listview data, app crashes every time.

the listview returns null time .

here fragment code

 @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     listview = (listview) getactivity().findviewbyid(r.id.list);strong text            imageadapter imageadapter = new imageadapter(this.getactivity(), images);     if(listview == null)         toast.maketext(this.getactivity(),"nulll", toast.length_long).show();             return inflater.inflate(r.layout.fragment_poster, container, false); }     

and here fragment layout

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent">    <listview      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_weight = "1"      android:id="@+id/list">   </listview>  </linearlayout> 

because trying find activity... not fragment.

view rootview = inflater.inflate(r.layout.fragment_poster, container, false);  listview = (listview) rootview.findviewbyid(r.id.list); imageadapter imageadapter = new imageadapter(getactivity(), images); listview.setadapter(imageadapter);  return rootview;