Android: 4.0.0

General Changes

JWPlayerView has been decoupled from the JWPlayer API, which enables your layouts to inflate quickly and provide a responsive user experience on screens that have a JWPlayerView.
JW Android SDK 4.0 uses fully native controls, which simplified control customization by using ViewModels.
Updated Java package root to be com.jwplayer.
Added support for Picture-in-Picture, Related feeds, and JW Recommendations.
Thumbnail preview is shown as the user seeks across the content if a thumbnail track is specified for a PlaylistItem
Improved accessibility support for screen readers.
Added helper classes to better support Background Audio.
Minimum OS is set to API 21.

Created new menu system for new design and updated seek bar thumbnail style, Casting menu, error code screen, Next Up card, and Live interface.

JW Android SDK 4.0 supports IMA, IMA DAI, and JWP VAST.
Added support for background loading of the next playlist item and VAST ads.
Added ads cue points for IMA.
Added feature to make IMA ad request before the ad break.
Added AdErrorEvent and AdImpressionEvent to help the customers to track ad related events.

Created a JWPlayerCompat class that contains all of the addOnXListener() and removeOnXListener() methods.
Added CaptionsListEven, ErrorEvent, and SetupErrorEvent to help the customers to track the list of captions and all error related events.
Renamed AdSource to AdClient.
Renamed ImaAdvertising to ImaAdvertisingConfig.
Renamed ImaDaiAdvertising to ImaDaiAdvertisingConfig.
Renamed ImaVMAPAdvertising to ImaVmapAdvertisingConfig.
Renamed VMAPAdvertising to VmapAdvertisingConfig.

Fixed an issue where TalkBack would not read the controlbar contents correctly.
Fixed an issue where the player does not maintain the selected resolution when replaying a video.