java - Saving data persistently -

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i have notes app whereby implemented 2 types of views: list , grid views. user can switch between listview , gridview depending on choice. issue have have been trying save state of view persistently such selected view opened @ start up. trying use sharedpreferences achieve this. doing getting wrong in code?

private static final string key_name = "viewstate"; private listview mlistnotes;     private gridview mgridnotes;  sharedpreferences sharedpreferences;     sharedpreferences.editor editor; private boolean mviewischanged = false;   @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate); // set layouts list/grid             mlistnotes = (listview) findviewbyid(r.id.main_listview);             mgridnotes = (gridview) findviewbyid(r.id.main_gridview);  // retrieve value shared preferences.     sharedpreferences = getpreferences(context.mode_private);     mviewischanged = sharedpreferences.getboolean(key_name, false);     if (!mviewischanged){         mlistnotes.setvisibility(view.visible);         mgridnotes.setvisibility(view.gone);}     else {         mlistnotes.setvisibility(view.gone);         mgridnotes.setvisibility(view.visible);     }    @override     public boolean onoptionsitemselected(menuitem item) {         layoutinflater inflater = (layoutinflater) getsystemservice(context.layout_inflater_service);      view customtitleview = inflater.inflate(r.layout.dialog_menu, null);         linearlayout mlistviewselect = (linearlayout) customtitleview.findviewbyid(r.id.list_select);         linearlayout mgridviewselect = (linearlayout) customtitleview.findviewbyid(r.id.grid_select);         switch (item.getitemid()) {             case r.id.additem:               //  start noteactivity                 startactivity(new intent(this, noteactivity.class));                 break;             case r.id.changeview:                 final alertdialog alertbox = new alertdialog.builder(this).create();                 alertbox.setcancelable(true);                 alertbox.setview(customtitleview);                 alertbox.show();                 mlistviewselect.setonclicklistener(new view.onclicklistener() {                     @override                     public void onclick(view v) {   // saving data sharedpreferences = getpreferences(context.mode_private); editor = sharedpreferences.edit();                     editor.putboolean(key_name, mviewischanged);                     editor.apply();                     mlistnotes.setvisibility(view.visible);                     mgridnotes.setvisibility(view.gone);                         alertbox.dismiss();                     }                 });         mgridviewselect.setonclicklistener(new view.onclicklistener() {     @override     public void onclick(view v) { // saving data in sharedpreferences         mviewischanged = true;         sharedpreferences = getpreferences(context.mode_private);         editor = sharedpreferences.edit();         editor.putboolean(key_name, mviewischanged);         editor.apply();         mlistnotes.setvisibility(view.gone);         mgridnotes.setvisibility(view.visible);         alertbox.dismiss();     } });

after in oncreate ()

mviewischanged = sharedpreferences.getboolean(key_name, false);  mlistnotes = (listview) findviewbyid(r.id.main_listview); mgridnotes = (gridview) findviewbyid(r.id.main_gridview);

add 

if (!mviewischanged){   mlistnotes.setvisibility(view.visible);   mgridnotes.setvisibility(view.gone);} else { mlistnotes.setvisibility(view.gone);     mgridnotes.setvisibility(view.visible); }

or put logic provided me after setting adapter in onresume() hope helps.


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