java - Saving Listview before Exiting App -


i save listview , components when exit app , come still available. cleared, , forced make new items.

i have been doing research on onsaveinstancestate, not sure how implement in current situation.

what should looking store current listview state? array?

mainactivity

@override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     setrequestedorientation(activityinfo.screen_orientation_portrait);      // check whether we're recreating destroyed instance     //if (savedinstancestate != null) {         // restore value of members saved state         //muser = savedinstancestate.getstring(state_user);     //} else {         // initialize members default values new         // instance         //muser = "newuser";     //}      // // detail controls     tvtitle = (textview) findviewbyid(r.id.textviewtitle);     tvdate = (textview) findviewbyid(r.id.textviewdate);     tvtime = (textview) findviewbyid(r.id.textviewtime);     ivpic = (imageview) findviewbyid(r.id.imageview1);      add = (imagebutton) findviewbyid(r.id.add);     add.setonclicklistener(this);  }  @override public void onclick(view v) {     // todo auto-generated method stub     switch (v.getid()) {     case r.id.add:         intent intent = new intent(this, createactivity.class);         startactivityforresult(intent, 100);         break;     } }  @override public void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);      // create adapter convert array views     eventadapter adapter = new eventadapter(this, lstevents);      // attach adapter list view     listview = (listview) findviewbyid(r.id.listviewfragment);     listview.setadapter(adapter);      if (requestcode == 100) {         if (resultcode == result_ok) {             bundle b = data.getextras();             title = b.getstring("title");             time = b.getstring("time");             date = b.getstring("date");              // retrieving bitmap createactivity              bitmap bitmap = (bitmap) b.getparcelable("drawable");              // converting bitmap drawable             drawable drawable = new bitmapdrawable(getresources(), bitmap);              log.e("title", title);             log.e("time", time);             log.e("date", date);              event newevent = new event();             newevent.set_date(date);             newevent.set_title(title);             newevent.set_time(time);              // set drawable             newevent.set_drawable(drawable);              lstevents.add(newevent);              adapter.addall(lstevents);             adapter.notifydatasetchanged();         }     }  }  @override protected void onsaveinstancestate(bundle savedinstancestate) {     // savedinstancestate.putint(state_user, muser);     // call superclass can save view hierarchy state     super.onsaveinstancestate(savedinstancestate); } }

you save elements in list inside sqlite db, or in file , read , put in listview.

you can mark event class serializable can save/restore class file , let java of work


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