java - ImageView in a List Null Pointer Exception -

i trying set list view images, ie no text. here files:

//the main file:     public class mainactivity extends activity {      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          listview listview1 = (listview)findviewbyid(r.id.listview1);         final integer[] mthumbids = {                 r.drawable.blue, r.drawable.blue2,                  r.drawable.blue3, r.drawable.blue4,                 r.drawable.blue5, r.drawable.blue6         };         listview1.setadapter(new imageadapter(this,mthumbids));         listview1.setonitemclicklistener(new onitemclicklistener() {             public void onitemclick(adapterview<?> parent, view v, int position, long id) {                //upon clicking             }         });     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }     class imageadapter extends arrayadapter<integer> {         private context mcontext;         integer [] resources;         public imageadapter (context c, integer[] resources) {             super(c, r.layout.activity_main, resources);             //system.out.println("set of image adapter");             mcontext = c;             this.resources=resources;             for(integer resource:resources){                 system.out.println(resource);             }         }         @override         public view getview(int position, view convertview, viewgroup parent) {             layoutinflater inflater = (layoutinflater)mcontext.getsystemservice(context.layout_inflater_service);             view rowview = inflater.inflate(r.layout.activity_main, parent, false);             imageview imageview = (imageview) rowview.findviewbyid(r.layout.image_view);             imageview.setimageresource(resources[position]);             return rowview;         }         }    } 

the xml follows:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent" >      <textview         android:id="@+id/export_folder_title"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:layout_alignparenttop="true"         android:text="formation name:"         android:textappearance="?android:attr/textappearancemedium" />     <listview         android:id="@+id/listview1"                 android:layout_below="@+id/color_textview"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:columnwidth="90dp"         android:numcolumns="auto_fit"         android:verticalspacing="10dp"         android:horizontalspacing="10dp"         android:stretchmode="columnwidth"         android:gravity="center"         android:background="#ff000000" >      </listview> </relativelayout> 

and finally, 1 defining imageview:

<relativelayout      xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:gravity="center_vertical"     android:minheight="64dp">     <imageview             android:id="@+id/imageview"             android:layout_width="32dp"             android:layout_height="32dp"             android:layout_alignparentleft="true"             android:layout_marginleft="9dp"             android:layout_alignparenttop="true"/> </relativelayout> 

unfortunately, nullpointerexceptions @ point set image resource on image view. image resources exist- i've made sure. not sure doing wrong, , new android. thank you.

looks inflating wrong xml in getview(),

view rowview = inflater.inflate(r.layout.activity_main, parent, false); 

here r.layout.activity_main should replaced xml file contains imageview.

and code, think name of xml file containing imageview is, r.layout.image_view

so, final code should this,

view rowview = inflater.inflate(r.layout.image_view, parent, false);             imageview imageview = (imageview) rowview.findviewbyid(r.id.imageview);             imageview.setimageresource(resources[position]);