com.firebaseui:firebase-ui-firestore:3.1.0 depends on android.arch.lifecycle:extensions:1.0.0-beta1. Switching to version 3.2.2 fixes the issue by using the Lifecycle 1.1 libraries that Support Library 27.1.0 are built upon. com.firebaseui:firebase-ui-firestore:3.1.0
阅读背景：
Error: Program type already present: android.arch.lifecycle.LifecycleRegistry$1
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