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hi guys
I create action bar for android application using c#.net.
my code is:
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.Main);

Directory.InitializeDirectory();
ActionBar bar = ActionBar;

mActionBarView = LayoutInflater.Inflate(Resource.Layout.action_bar_custom, null);
ActionBar.SetCustomView(mActionBarView, new ActionBar.LayoutParams(WindowManagerLayoutParams.WrapContent, WindowManagerLayoutParams.WrapContent));

var tab1 = ActionBar.NewTab();
tab1.SetText("Login");
tab1.SetTabListener(actionbarInterface);
bar.AddTab(bar.NewTab().SetText("Login").SetTabListener(actionbarInterface));
bar.CustomView = mActionBarView;
bar.DisplayOptions = ActionBarDisplayOptions.ShowCustom | ActionBarDisplayOptions.UseLogo;
bar.NavigationMode = ActionBarNavigationMode.Tabs;
bar.SetDisplayShowHomeEnabled(true);
tab1.TabSelected += delegate
{
TitlesFragment titleFrag = (TitlesFragment)FragmentManager.FindFragmentById(Resource.Id.frag_title);
titleFrag.PopulateTitles(tab1.Position);

titleFrag.SelectPosition(0);
};
but in line tab1.SetTabListener(actionbarInterface)has error Unhandled Exception:

Java.Lang.IllegalStateException
plz help me.

Please edit your question and:

Format your code by putting <pre> tags around it.
Give the complete text of the exception message, or modify your code to catch it.

One of these days I'm going to think of a really clever signature.

my code is :

C#

protected override void OnCreate(Bundle bundle)
       {
           base.OnCreate(bundle);
           SetContentView(Resource.Layout.Main);
       
           Directory.InitializeDirectory();
           ActionBar bar = ActionBar;

           
           mActionBarView = LayoutInflater.Inflate(Resource.Layout.action_bar_custom, null);
           ActionBar.SetCustomView(mActionBarView, new ActionBar.LayoutParams(WindowManagerLayoutParams.WrapContent, WindowManagerLayoutParams.WrapContent));

           var tab1 = ActionBar.NewTab();
           tab1.SetText("Login");
           tab1.SetTabListener(actionbarInterface);
           bar.AddTab(bar.NewTab().SetText("Login").SetTabListener(actionbarInterface));
           bar.CustomView = mActionBarView;
           bar.DisplayOptions = ActionBarDisplayOptions.ShowCustom | ActionBarDisplayOptions.UseLogo;
           bar.NavigationMode = ActionBarNavigationMode.Tabs;
           bar.SetDisplayShowHomeEnabled(true);

The full text of the error is

CSS

Unhandled Exception:Java.Lang.IllegalStateException

.

It would seem that you may be calling some method before the application is ready to process it: see here[^].

One of these days I'm going to think of a really clever signature.

how to create action bar for android application using c#?