android - i am getting null pointer exception when i am trying to download image... -

i want download image internet ...but getting null pointer exception want know major difference bw url connection , http connection if there

pls tell tell me solution
here code thank u

public class detailsactivity extends activity { private textview textview1;  private textview textview2; private textview textview3; private textview textview4; private textview textview5; //private imageview image;  imageview image; static bitmap bm; progressdialog pd; string imageurl = "http://theopentutorials.com/totwp331/wp-content/uploads/totlogo.png"; bitmapfactory.options bmoptions;     public class imagedownload extends asynctask<string, void, string> {      protected string doinbackground(string... params) {         // todo auto-generated method stub         bmoptions = new bitmapfactory.options();         bmoptions.insamplesize = 1;         loadbitmap(imageurl, bmoptions);         return imageurl;     }      protected void onpostexecute(string imageurl) {         pd.dismiss();         if (!imageurl.equals("")) {             image.setimagebitmap(bm);//error here null pointer exception         } else {             toast.maketext(detailsactivity.this,                     "não foi possível obter resultados", toast.length_long)                     .show();         }     }  }  public static bitmap loadbitmap(string url, bitmapfactory.options options) {     inputstream in = null;     try {         in = openhttpconnection(url);         bm = bitmapfactory.decodestream(in, null, options);         in.close();     } catch (ioexception e1) {     }     return bm; }  private static inputstream openhttpconnection(string strurl)         throws ioexception {     inputstream inputstream = null;     url url = new url(strurl);     urlconnection conn = url.openconnection();      try {         httpurlconnection httpconn = (httpurlconnection) conn;         httpconn.setrequestmethod("get");         httpconn.connect();          if (httpconn.getresponsecode() == httpurlconnection.http_ok) {             inputstream = httpconn.getinputstream();         }     } catch (exception ex) {     }     return inputstream; }   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      image = (imageview)findviewbyid(r.id.imageview2);     actionbar actionbar = getactionbar();     actionbar.hide();     setcontentview(r.layout.activity_details);      pd = progressdialog.show(detailsactivity.this, "testing",                 "loading");     new imagedownload().execute("");     //asyncdownload(); }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.details, menu);     textview1 = (textview)findviewbyid(r.id.textdetailplace);     textview2 = (textview)findviewbyid(r.id.textdetailaddress );     textview3 = (textview)findviewbyid(r.id.textcapacity);     //  textview4 = (textview)findviewbyid(r.id.textdetailcontactno);     textview5 = (textview) findviewbyid(r.id.textviewdescription);      textview1.settext(getintent().getextras().getstring("test"));     textview2.settext(getintent().getextras().getstring("test2"));     textview3.settext(getintent().getextras().getstring("test3"));     //textview4.settext(getintent().getextras().getstring("test4"));     textview5.settext(getintent().getextras().getstring("test5"));      return true; } 

}

put image = (imageview)findviewbyid(r.id.imageview2); after set content view.

you can find view after setting view activity.then identifies id form xml layout.

setcontentview(r.layout.activity_details); image = (imageview)findviewbyid(r.id.imageview2);