Which one should I pick for a new project?

I can only give you architectural and maintenance signals to inform your decision—not a recommendation, since your choice depends on your project's specific requirements.

baseflow/photoview (Android image zooming):

• Status: Stale — last commit 4 years ago (RepoPilot verdict: WAIT)
• Purpose: Zooming ImageView implementation with multi-touch, double-tap, and ViewPager support [README.md:79-98]
• Use case: If you need a pure image zoom/pan library for Android

tencent/tinker (Android hot-fix patching):

• Purpose: Hot-fix framework for Android apps — allows runtime patching of dex, libraries, and resources without app reinstallation [README.md:13-75]
• Use case: If you need production hot-patching capability

These solve different problems. If you need image viewing, pick photoview. If you need runtime app patching, pick tinker. If you need both, you'd use them together.

For photoview specifically: The 4-year staleness is a signal to audit it carefully before production use. Check whether its Android API surface is still compatible with your target versions, and whether open issues on GitHub affect your use case.

FOLLOW_UPS:

• Does photoview support current Android API levels?
• What known issues does tinker have in production?
• Can photoview and tinker work together?