popupwindow - Problems creating a Popup Window in Android Activity -

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i'm trying create popup window appears first time application starts. want display text , have button close popup. however, i'm having troubles getting popupwindow work. i've tried 2 different ways of doing it:

first have xml file declares layout of popup called popup.xml (a textview inside linearlayout) , i've added in oncreate() of main activity:

popupwindow pw = new popupwindow(findviewbyid(r.id.popup), 100, 100, true);     pw.showatlocation(findviewbyid(r.id.main), gravity.center, 0, 0);

second did exact same code:

final layoutinflater inflater = (layoutinflater)this.getsystemservice(context.layout_inflater_service);     popupwindow pw = new popupwindow(inflater.inflate(r.layout.popup, (viewgroup) findviewbyid(r.layout.main) ), 100, 100, true);     pw.showatlocation(findviewbyid(r.id.main_page_layout), gravity.center, 0, 0);

the first throws nullpointerexception , second throws badtokenexception , says "unable add window -- token null not valid"

what in world doing wrong? i'm extremely novice please bear me.

to avoid badtokenexception, need defer showing popup until after lifecycle methods called (-> activity window displayed):

 findviewbyid(r.id.main_page_layout).post(new runnable() {    public void run() {      pw.showatlocation(findviewbyid(r.id.main_page_layout), gravity.center, 0, 0);    } });

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