c# - Save the state of my Activity xamarin.android -


i want save state of activity when closes app. contains listactivity simplelistitemchecked...

   namespace xamarinscanner      {       [activity(label = "@string/scanhistory", screenorientation = screenorientation.portrait)]      public class scanhistoryactivity : listactivity {     protected override void oncreate(bundle bundle)     {         base.oncreate(bundle);         var codes = intent.extras.getstringarraylist("codes");          codes.tolist();         listadapter = new arrayadapter<string>(this, android.resource.layout.simplelistitemchecked, codes);         listview lv = findviewbyid<listview>(android.resource.id.list);         lv.choicemode = choicemode.multiple;          foreach (var c in codes)         {             if (c.contains("success"))             {                 int position = codes.indexof(c);                 lv.setitemchecked(position, true);             }         }     } }

}

this save state mainactivity, seems keep data listactivity , main activity when backgrounded. think need same thing when app destroyed..

    protected override void onsaveinstancestate(bundle outstate)'        {         outstate.putstringarraylist("codes", _codes.toarray());         base.onsaveinstancestate(outstate);     }     protected override void oncreate(bundle bundle)     {          url = "http://10.0.0.103:4321/scan";         if (bundle != null)         {             var c = bundle.getstringarraylist("codes");            instance state");         }         base.oncreate(bundle);         setcontentview(resource.layout.main);`

what mean when user close app? mean when close moment , open again or when app closed completely?
if mean 2nd, should use ondestroy "save" state , load in on oncreate in next time. have manually create save , load procedure (with database?sharedpreferences? it's you)
check here activity lifecycle.

also post have try far , didnt want , exact results expecting

a simple way of storing value on ondestroy sharedpreferences:

isharedpreferences prefs = preferencemanager.getdefaultsharedpreferences (application.context); isharedpreferenceseditor editor = prefs.edit (); editor.putboolean ("keyname", _bool); // editor.commit();    // applies changes synchronously on older apis editor.apply();        // applies changes asynchronously on newer apis

access saved values using:

isharedpreferences prefs = preferencemanager.getdefaultsharedpreferences (application.context); _bool = prefs.getboolean ("keyname"); _int = prefs.getint ("keyname"); _string = prefs.getstring ("keyname");

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