c# xamarin Populate Second Spinner Based on Selection of 1st

Qing Ryder

can Someone give me a link to achieve this. i have searched on google and youtube and all i see are examples of java and json.

All ideas are wonderfully Appreciated.

12 Replies

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Amit Gupta8y ago
Accepted answer
Here's the snippet, you need to add to the fragment1.cs class.

1. Add a second spinner named spinner2 in your fragment layout file
2. Added some snippet in fragment1.cs file
Spinner spinner2;
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var ignored = base.OnCreateView(inflater, container, savedInstanceState);
            var view = inflater.Inflate(Resource.Layout.fragment1, null);

            Spinner spinner = view.FindViewById(Resource.Id.spinner);
            spinner2 = view.FindViewById(Resource.Id.spinner2);

            spinner.ItemSelected += new EventHandler(spinner_ItemSelected);
            var adapter = ArrayAdapter.CreateFromResource(
                    view.Context, Resource.Array.planets_array, Android.Resource.Layout.SimpleSpinnerItem);

            adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
            spinner.Adapter = adapter;

            return view;
        }

        private void spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e)
        {
            int resourceID = 0;
            switch (e.Position)//position is the array index
            {
                case 0: //mercury
                    resourceID = Resource.Array.mercury_array;
                    break;
                case 1: //venus
                    resourceID = Resource.Array.venus_array;
                    break;
            }

            if (resourceID > 0)
            {
                var adapter = ArrayAdapter.CreateFromResource(
                    e.View.Context, resourceID, Android.Resource.Layout.SimpleSpinnerItem);

                adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
                spinner2.Adapter = adapter;
            }
            else
                spinner2.Adapter = null;
        }
3. Now the output will be as expected.

Good Luck
Qing Ryder8y ago
Sir, if you can please explain further with example, i couldnt understand your reply
Amit Gupta8y ago
Hey You can bind as many drop-down list as you have required, the process will be same as I possted in my earlier reply, you can make a centralized function that can be used to bind the dropdown
Qing Ryder8y ago
If i want to Populate a third spinner based on the 2nd spinner, how do i achieve this. Bearing in mind that i had like 7 cases in spinner2.
Qing Ryder8y ago
i corrected my mistakes
Thank you
Amit Gupta8y ago
I think you missed to initiate the spinner1, you have to initiate it in OnCreateView
Qing Ryder8y ago
I tried your code but it didint work.

even without commenting the else statement
Amit Gupta8y ago
Here's the snippet, you need to add to the fragment1.cs class.

1. Add a second spinner named spinner2 in your fragment layout file
2. Added some snippet in fragment1.cs file
Spinner spinner2;
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var ignored = base.OnCreateView(inflater, container, savedInstanceState);
            var view = inflater.Inflate(Resource.Layout.fragment1, null);

            Spinner spinner = view.FindViewById(Resource.Id.spinner);
            spinner2 = view.FindViewById(Resource.Id.spinner2);

            spinner.ItemSelected += new EventHandler(spinner_ItemSelected);
            var adapter = ArrayAdapter.CreateFromResource(
                    view.Context, Resource.Array.planets_array, Android.Resource.Layout.SimpleSpinnerItem);

            adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
            spinner.Adapter = adapter;

            return view;
        }

        private void spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e)
        {
            int resourceID = 0;
            switch (e.Position)//position is the array index
            {
                case 0: //mercury
                    resourceID = Resource.Array.mercury_array;
                    break;
                case 1: //venus
                    resourceID = Resource.Array.venus_array;
                    break;
            }

            if (resourceID > 0)
            {
                var adapter = ArrayAdapter.CreateFromResource(
                    e.View.Context, resourceID, Android.Resource.Layout.SimpleSpinnerItem);

                adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
                spinner2.Adapter = adapter;
            }
            else
                spinner2.Adapter = null;
        }
3. Now the output will be as expected.

Good Luck
Qing Ryder8y ago
like say
the first spinner should house country,
once the user selects his country, the second spinner should be populated with states in that country.
Amit Gupta8y ago
You just need to change the spinner adapter for the second spinner.

1. Goto the selection changed event of 1st spinner
2. Copy the spinner adapter code (that is used to fill the first spinner) and modify it on it.
3. All done !!
Qing Ryder8y ago
NO, Please can you give me hint
Amit Gupta8y ago
Hey

You can populate the second spinner on the event of selection changed of first spinner. I think the same event has already been generated in your previous question.