Android allows you to create app shortcuts, but you can also create special shortcuts that link directly to screens within an app. For example, shortcuts could link to the Navigation screen in Maps or any screen in the Settings app.
We’re using Android’s “activities” system for this. Activities are essentially screens within an app. For example, each pane in Android’s Settings app is a separate activity. The New Note and Compose Email screens in Evernote and Gmail are separate activities, too.
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via How-To Geek http://www.howtogeek.com/169408/go-directly-from-your-android-home-screen-to-screens-within-an-app-with-activity-shortcuts/