Using the simple_spinner_dropdown_item.xml definition. You can do the same to change the dropdown list item’s style. I use that as a base definition, so I’ll only changed what I need. You can check out the original android layouts definitions for the android.R.layout.simple_spinner_item resource bellow. Let’s call it spinner_dropdown_item.xml: Īnother change in the declaration of the spinner: ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.anets_array, R.layout.spinner_item) ĪtDropDownViewResource(R.layout.spinner_dropdown_item) Īnd this is what we get: Default spinner item definitions If you want to customize the dropdown list items you will need to create a new layout file. This is my spinner_item.xml: Īnd then change your declaration of the spinner to use the R.layout.spinner_item: ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.anets_array, R.layout.spinner_item) Comments are added inside the code to understand the code in more detail. Below is the code for the activitymain.xml file.

What you need to do is create your own layout file with a custom definition for the spinner item. Next, go to the activitymain.xml file, which represents the UI of the project. Nothing will actually change in your app. When you apply the textSize to a Spinner, like so:

Changing the text size or color of a Spinner is not as simple as just using the android:textSize attribute on the Spinner element.

Android studio spinner dialog