android - show video Tile in exoplayer -

how can show video tile(thumbnail) instead of it's name in exoplayer?

this code use , , it's result :

public class samplechooseractivity extends activity {    @override   public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.sample_chooser_activity);      listview samplelist = (listview) findviewbyid(r.id.sample_list);     final sampleadapter sampleadapter = new sampleadapter(this);      sampleadapter.add(new header("local videos"));     sampleadapter.addall((object[]) samples.local_videos);      samplelist.setadapter(sampleadapter);     samplelist.setonitemclicklistener(new onitemclicklistener() {       @override       public void onitemclick(adapterview<?> parent, view view, int position, long id) {         object item = sampleadapter.getitem(position);         if (item instanceof samples.sample) {           onsampleselected((samples.sample) item);         }       }     });   }    private void onsampleselected(samples.sample sample) {     intent mpdintent = new intent(this, playeractivity.class)         .setdata(uri.parse(sample.uri))         .putextra(playeractivity.content_id_extra, sample.contentid)         .putextra(playeractivity.content_type_extra, sample.type)         .putextra(playeractivity.provider_extra, sample.provider);     startactivity(mpdintent);   }    private static class sampleadapter extends arrayadapter<object> {      public sampleadapter(context context) {       super(context, 0);     }      @override     public view getview(int position, view convertview, viewgroup parent) {       view view = convertview;       if (view == null) {         int layoutid = getitemviewtype(position) == 1 ? android.r.layout.simple_list_item_1             : r.layout.sample_chooser_inline_header;         view = layoutinflater.from(getcontext()).inflate(layoutid, null, false);       }       object item = getitem(position);       string name = null;       if (item instanceof samples.sample) {         name = ((samples.sample) item).name;       } else if (item instanceof header) {         name = ((header) item).name;       }       ((textview) view).settext(name);       return view;     }      @override     public int getitemviewtype(int position) {       return (getitem(position) instanceof samples.sample) ? 1 : 0;     }      @override     public int getviewtypecount() {       return 2;     }    }    private static class header {      public final string name;      public header(string name) {       this.name = name;     }    }  } 

xml file :

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">    <listview android:id="@+id/sample_list"       android:layout_width="match_parent"       android:layout_height="match_parent"/>  </linearlayout> 

as see in image above, video name shown,but want show tile(thumbnail) of video ( screenshot of video) instead of video name,how can ?
edit
used code bitmap thumbnail bitmap null :

string path = "file:///android_asset/video1.mp4"; bitmap thumb = thumbnailutils.createvideothumbnail(path, mediastore.images.thumbnails.mini_kind); 

use bellow code create thumbnail video :

bitmap thumb = thumbnailutils.createvideothumbnail(path, mediastore.images.thumbnails.mini_kind);