无法启动活动ComponentInfo。 java.lang.NullPointerException：Firestore组件不存在

Question

我在Android上使用Firebase，我试图通过以下方式实例化Firestore：FirebaseFirestore rootRef = FirebaseFirestore.getInstance()但是我得到Null指针异常

p.s。：如果我没有实例化FirebaseApp FirebaseApp.initializeApp(this)), I get the error: "java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process. Make sure to call FirebaseApp.initializeApp(Context) first.

[EDITED]

APP build.gradle：

https://pastebin.com/k7e0Vzy4

PROJECT build.gradle：

https://pastebin.com/hMjwpAK9

有什么建议？

Answer 1

在获取实例之前使用Firebase初始化应用程序

FirebaseApp.initializeApp(this);
FirebaseFirestore rootRef = FirebaseFirestore.getInstance()