Adidas won't seek to renew its apparel deal with the league that will expire after the 2016-17 season. The logical replacements would be Nike or Under Armour.
https://espn.go.com/nba/story/_/id/12493645/adidas-pursue-extension-nba-apparel-deal
https://espn.go.com/nba/story/_/id/12493645/adidas-pursue-extension-nba-apparel-deal