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

Question

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.

Amit Gupta · 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

Amit Gupta · 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 Ryder · Answer

I tried your code but it didint work. even without commenting the else statement

Qing Ryder · Answer

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 Gupta · Answer

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 Ryder · Answer

NO, Please can you give me hint

Amit Gupta · Answer

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.

Qing Ryder · Answer

Sir, if you can please explain further with example, i couldnt understand your reply

Amit Gupta · Answer

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 Ryder · Answer

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 Ryder · Answer

i corrected my mistakes Thank you

Amit Gupta · Answer

I think you missed to initiate the spinner1, you have to initiate it in OnCreateView