How to make an Android Spinner with initial text "Select One"? - Stack Overflow
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Android - The Technical Blog: Spinner with "re-select" functionality
SetSelection not working. · Issue #129 · ganfra/MaterialSpinner · GitHub
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android for beginners: Using spinner.setSelection & finding the spinner doesn't show the selected item when closed?
Android Spinner with Search using XML Example
Creating and Using a Spinner. Multiple Options to choose from! | by Sung Park | Sketchware | Medium