Meet Google Play’s target API level requirement
Google Play will require that new apps target at least Android 8.0 (API level 26) from August 2018, and that app updates target Android 8.0 from November 2018.
Every new Android version introduces changes that bring significant security and performance improvements – and enhance the user experience of Android overall. Some of these changes only apply to apps that explicitly declare support through their targetSdkVersion manifest attribute (also known as the target API level).
Configuring your app to target a recent API level ensures that users can benefit from these improvements, while still allowing it to run on older Android versions. Targeting a recent API level also allows your app to take advantage of the platform’s latest features to delight your users.