java - 尽管已初始化，但 Firebase 抛出未初始化的错误

Question

我正在尝试在 Android 应用程序中设置 firebase 消息传递，据我所知，在对 firebase 类执行任何其他操作之前，我需要运行 FirebaseApp.initializeApp(context)。我遇到的问题是在尝试使用 FirebaseInstanceId.getInstance().getInstanceId() 获取设备 token 之前，我正在运行 initializeApp，但 firebase 仍在抛出此问题错误:

09-05 11:16:20.314 24640-24640/com.company.AppName E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.company.AppName, PID: 24640
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.company.AppName/com.company.AppName.MainActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.company.AppName. Make sure to call FirebaseApp.initializeApp(Context) first.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
     Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.company.AppName. Make sure to call FirebaseApp.initializeApp(Context) first.
        at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.1:219)
        at com.google.firebase.iid.FirebaseInstanceId.getInstance(Unknown Source:1)
        at com.company.AppName.MainActivity.onCreate(MainActivity.java:48)
        at android.app.Activity.performCreate(Activity.java:7009)
        at android.app.Activity.performCreate(Activity.java:7000)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)

这是初始化 firebase 并抛出错误的代码(在 MainActivity.java onCreate 中):

FirebaseApp.initializeApp(this);
NativeApp
    .shared()
    .setContext(this)
    .setDeviceToken(FirebaseInstanceId.getInstance().getInstanceId().toString());

如果我注释掉 setDeviceToken 行，则不会引发任何错误。 initializeApp 是异步的吗？ Firebase Android setup guide设法甚至不提 initializeApp。

Answer 1

如果您使用 documented procedure 执行与 Firebase 的集成，则无需调用 initializeApp .如果您进行标准集成，Firebase 将在应用启动时自动初始化。请在 API docs for FirebaseApp 中阅读更多相关信息.

如果您没有执行标准集成，那么您需要在正确的时间为您的用例调用 initializeApp。