nullpointerexception - Android Application finish prob -

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i using custom alert dialog. if user go negative button of code need close app totally. using following code.

public class testapp extends tabactivity {      private int tabid = 0;      /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);         setcontentview(r.layout.main);          final tabhost tabhost = gettabhost();  // activity tabhost         tabhost.tabspec spec;  // resusable tabspec each tab          intent intent;  // reusable intent each tab         intent myint = this.getintent();         tabid = myint.getintextra("tab_id", 0);          .......................         .........................         .......................           tabhost.setcurrenttab(tabid);          showreward(this);     }      private void showreward(context c) {         // todo auto-generated method stub         final alertdialog.builder builder;         alertdialog alertdialog;         context mcontext = c;         layoutinflater inflater = (layoutinflater) mcontext.getsystemservice(layout_inflater_service);         view layout = inflater.inflate(r.layout.custom_dialog, (viewgroup) findviewbyid(r.id.layout_root));         textview text = (textview) layout.findviewbyid(r.id.title);         text.settext("sample text");         text.setgravity(gravity.center);         textview msg = (textview) layout.findviewbyid(r.id.msg);         msg.settext("sample text.");         builder = new alertdialog.builder(mcontext);         builder.setview(layout);                 builder.setpositivebutton("ok", new dialoginterface.onclicklistener() {             public void onclick(dialoginterface dialog, int which) {                 dialog.cancel();             }         });         builder.setnegativebutton("cancel", new dialoginterface.onclicklistener() {             public void onclick(dialoginterface dialog, int which) {                 log.d(null,"step1");                 dialog.cancel();                 log.d(null,"step2");                 closeapp();             }         });         alertdialog = builder.create();         alertdialog.show();     }      private void closeapp(){         log.d(null,"step3");         this.finish();     }   }

but working before add showreward() function. when u add function, dialog box appearing perfectly. if click on negative button giving nullpointerexception due "unable destroy activity". whats problem code?

this problem related cursor.close() @ time finish. no such close during finish()


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