Google is requesting API28 already. What are you planning to do about it? Please, keep me post. I'm really worried about it. These are the warnings I am receiving while uploading my app:
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Target API level requirements from August 2019
Warning:
Your app currently targets API level 27 and must target at least API level 28 to ensure it is built on the latest APIs optimized for security and performance.
From August 2019, new apps must target at least Android 9.0 (API level 28).
From November 2019, app updates must target Android 9.0 (API level 28).
Tip:
Change your app's target API level.
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Unoptimized APK
Warning:
This APK results in unused code and resources being sent to users. Your app could be smaller if you used the Android App Bundle. By not optimizing your app for device configurations, your app is larger to download and install on users' devices than it needs to be. Larger apps see lower install success rates and take up storage on users' devices.
Resolution:
Use the Android App Bundle to automatically optimize for device configurations, or manage it yourself with multiple APKs.