The Properties list in Studio for the Spinner does not have a text size attribute ( android:textSize), unlike, for example a TextView. Why Using android:textSize on Spinner Does Not Work

Follow the article Load Values into an Android Spinner to get a working Spinner running.

An Empty Activity is used with other settings left at their default values. When entering code in Studio add import statements when prompted by pressing Alt-Enter.) Create a New Studio ProjectĬreate a new project in Android Studio, here called Spinner Style. The example code can be changed to meet your own requirements. (This Android Spinner styling tutorial assumes that Android Studio is installed, a basic App can be created and run, and the code in this article can be correctly copied into Android Studio. This tutorial covers changing the style of the text values in an Android Spinner. This has implications if the size of the Spinner text, or the color of the text needs to be changed. The previous article used the existing Android simple_spinner_item as the View for the data items.

That is assigned when the Adapter that links the data to the Spinner is created. It was stated in the article that the Spinner definition in the layout file does not define the View that the data being displayed uses. The article Load Values into an Android Spinner showed how a Spinner is set up. Changing Android Spinner Text Size with Styles

Android studio theme text size