The Gmail app for Android looks set to introduce advertising in the near future, based on a behind-the-scenes examination of the recent v4.6 update.
In its teardown of the apps APK file, Android Police noted multiple reference to ads, including the addition of an entire library called ‘ads’ containing xml files referring to the presentation of ads.
Android Police says that its discovery suggests that users will be able to save an ad to their inbox or discard it, depending on whether theyre interested. 
Gmail on desktop currently features text ads as well as the native advertising recently introduced along with its inbox tabs view, but until now the app has stayed ad-free.
