问题
What does exactly adding apply plugin: 'com.google.gms.google-services' do? If I comment this, my app still will compile and run. More about adding Firebase to the project here.
回答1:
It reads resources out of your google-services.json file as described here. It also adds a compile dependency on firebase-core if not already present. That dependency will cause FirebaseInitProvider to get merged into your manifest, which is responsible for initializing a default FirebaseApp at app launch with the resources it read during the build phase.
If you want to learn more about Firebase app init, read:
- How does Firebase initialize on Android?
- Take Control of Your Firebase Init on Android
来源：https://stackoverflow.com/questions/47231761/what-does-apply-plugin-com-google-gms-google-services-do