IssueTracker

Library used (support-v4, appcompat-v7, ...): appcompat-v7-23.1.1
Theme used: N/A
Devices/Android versions reproduced on: <21

https://github.com/android/platform_frameworks_support/blob/66698bb/v7/appcompat/src/android/support/v7/widget/AppCompatSpinner.java#L311

This method is using Context#getDrawable(int) which is 21+, and I assume should be using ContextCompat#getDrawable(Context, int)

Ultimately, this yields the following exception on versions of Android prior to API level 21:

03-01 15:44:03.237 E/AndroidRuntime(32158): FATAL EXCEPTION: main
03-01 15:44:03.237 E/AndroidRuntime(32158): java.lang.NoSuchMethodError: android.content.Context.getDrawable
03-01 15:44:03.237 E/AndroidRuntime(32158):     at android.support.v7.widget.AppCompatSpinner.setPopupBackgroundResource(AppCompatSpinner.java:302)

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Workaround is to use the setPopupBackgroundDrawable(Drawable) method with one's own call to ContextCompat#getDrawable(Context, int)