user interface - Android : first activity launched -

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a strange behavior i'm tearing eyes on since afternoon, i'm givin understanding perhaps has idea (yeah, i'm beginner, has idea ^^).

situation :

mainactivity.java (first 1 called, 1 of interest here)

    public expandablelistview listclubs;      @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      listclubs = (expandablelistview) findviewbyid(r.id.explstmainclubs);     appglobal.createdistricts() ;      elvadapterdistrictsclubs adapter = new elvadapterdistrictsclubs(this);           listclubs.setadapter(adapter);       }

it's code in class. basically, i'm filling expandablelist adapter relies on what's created in createdistricts() method (creates business objects, districts containing clubs containing members, events, etc.).

basically (again ^^), runs fine, on first start explist works expected, rest of app. if hit button mainactivity, however, , rerun app, "strange" (to me @ least) behavior occurs :

the explist loaded twice in row - first 1 data, works fine, , below duplicate (with same 2 groups, i.e. here 2 districts in sample data), doesn't work @ (if try expand it, crashes app).

frankly, i'm lost - i've tried things on various on[pause/stop/destroy/start/resume] etc. no avail (therefore, there yet nothing done on side, no override, seems not bring good).

as oncreate after ondestroy load bundle, should load explist were, , in case there might conflict between "old" groups/children , actual ones (currently, data simulated, afterward come remote data source), , haven't decided yet best "save" behavior is, i.e. if should find way obliterate explist ondestroy in order sure it's 100% recreated anew (and how 1 ?) , start scratch, or if use explist is, while updating it's content, in order not lose previous selection. may irrelevant complicate matters in order that, first list being not big , quite used reach second activity...

anyway, suspect comes around part, bundle load after destroy , rerunning, reload explist , add things instead of first deleting ? found confusing next activity (reached clicking 1 of items of explist) displays similar explist (filled months , events per month selected club), , doesn't present same strange behavior after destroy... , both have identical explist declaration in original xml layout so... well, perhaps tomorrow morning i'll see light, if has idea, feel free :d

the more write, more think should first clear explist but... don't see how exactly. i've tried

listclubs.removeviewsinlayout(0, listclubs.getcount()) ;

but doesn't seem anything.

thanks in advance

nothing related android behavior - recreating everytime whole set of bo behind if base arraylist of districts not null... instead of getting out of method, raises question - how state of arraylist, declared in subclass of application serving application in manifest ? i'll have make tests that...


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