As of the latest updates, version 1.5.6.39 is the current stable build for Stardew Valley on Google Play. It includes:
Locate a trusted source for the Stardew Valley 1.5.6.39 APK file. stardew valley 1.5.6.39 apk download
You should still purchase the game legitimately. The APK for Stardew Valley is not freeware. If you download a pirated copy, you miss official support, and you risk malware. The safest approach: buy it on Google Play once, then extract or backup the APK for personal offline use. As of the latest updates, version 1