android - How to enable button after using spinner -

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i creating program has mainmenubutton button (created in oncreate) disabled default. user first has check few boxes , select spinner before mainmenubutton button becomes enabled. currently, can't button enable after using spinner.

i've tried both

 @override     public void onclick(view v)      {      switch(v.getid())       {        case r.id.main_menu_button:           openmainmenu();           break;        case  r.id.building_spinner:           button mainmenubutton=(button)findviewbyid(r.id.main_menu_button);            mainmenubutton.setenabled(true);           break;       }     }

and

    public void onitemselected(adapterview<?> parent, view view, int position, long id)     {         view mainmenubutton=(view)findviewbyid(r.id.main_menu_button);          mainmenubutton.setenabled(true);     }

but no avail. i've tried replacing view button, didn't enable mainmenubutton either. supposed enable button after on spinner has been selected?

also, there of big difference implement checkboxes well?

edit2 :

if comment out if , else statement, button remains permanently disabled. if leave is, button never disabled begin , never disables, don't understand because haven't touched spinner, should disabled default.

public void onitemselected(adapterview<?> parent, view view, int position, long id) {      string buildingstring = parent.getitematposition(position).tostring();     if(buildingstring !="select building")     {         button mainmenubutton=(button)findviewbyid(r.id.main_menu_button);          mainmenubutton.setenabled(true);     }     else     {         button mainmenubutton=(button)findviewbyid(r.id.main_menu_button);          mainmenubutton.setenabled(false);     }   }

im not sure if affects it, spinner strings formatted :

<string-array name="building_array">         <item>select building</item>

you've not registered listener on spinner.

add in oncreate

spinner.setonitemselectedlistener(this);

and write code in onitemselected.


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