https://developer.android.com/about/versions/oreo
https://developer.android.com/about/versions/oreo/android-8.0-migration
https://developer.android.com/about/versions/oreo/android-8.0
https://developer.android.com/about/versions/oreo/android-8.0-changes
https://developer.android.com/about/versions/oreo/background
https://developer.android.com/about/versions/oreo/background-location-limits
https://developer.android.com/about/versions/oreo/android-8.0-samples

• Picture-in-Picture mode

• Notifications

• Autofill framework

• Downloadable Fonts

• Fonts in XML

• Autosizing TextViews

• Adaptive icons

• Color management

• Multi-display support

• Unified layout margins and padding

• App categories

• Audio focus enhancements

• Tooltips