android - NullpointerException in onPreExcute of AsyncTask for ProgressBar -


i had nullpointerexception when try set progessbar visible in onpreexecute asynctask (mprogressbar.setvisibility(view.visible);). don't know went wrong! all!

 <progressbar      android:id="@+id/pb_featured_game_progress"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:visibility="gone"     /> 
public class mainactivity extends activity {  ...  private progressbar mprogressbar;    @override protected void oncreate(bundle savedinstancestate) {  new fetchgamestask().execute();   private class fetchgamestask extends         asynctask<integer, integer, list<gameinfo>> {       @override     protected void onpreexecute() {         // todo auto-generated method stub          super.onpreexecute();          mprogressbar = (progressbar)findviewbyid(r.id.pb_featured_game_progress);         mprogressbar.setvisibility(view.visible);     }

before call execute on fetchgamestask, should associate main view xml file.

like this

protected void oncreate(bundle savedinstancestate) { // os inflate main_activity.xml // file , use activity setcontentview(r.layout.main_activity); new fetchgamestask().execute();

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