次要应用程序的FireBaseMessaging.getInstance（firebaseApp）应该是公共的，但它是私有的？

Question

https://firebase.google.com/docs/reference/admin/java/reference/com/google/firebase/messaging/firebaseMessaging#public-static-synchronized-firebaseMessaging-getinstance-firebaseApp-App

public static synchronized FirebaseMessaging getInstance (FirebaseApp app)

implementation "com.google.firebase:firebase-messaging:20.2.0"

但是，当我试图用重载的GetInstance实例化FirebaseMessaging时，我得到一个错误，说明它是不可访问的。当我查看包源代码时，反编译显示重载的构造函数不像无参数的GetInstance那样是公共的：

java prettyprint-override">public class FirebaseMessaging {
    public static final String INSTANCE_ID_SCOPE = "FCM";
    private final Context zzb;
    private final FirebaseInstanceId zzc;
    private final Task<zzab> zzd;
    @Nullable
    @SuppressLint({"FirebaseUnknownNullness"})
    @VisibleForTesting
    static TransportFactory zza;

    @NonNull
    public static synchronized FirebaseMessaging getInstance() {
        return getInstance(FirebaseApp.getInstance());
    }

    @Keep
    @NonNull
    static synchronized FirebaseMessaging getInstance(@NonNull FirebaseApp var0) {
        return (FirebaseMessaging)var0.get(FirebaseMessaging.class);
    }

我是不是漏掉了什么？

Answer 1

我已经验证了一种方法来做到这一点，因为我一直面临着类似的问题。

我使用google-services.json文件注册了其中一个项目。

现在，根据文档：

对于第二个项目，我使用以下文档中的代码手动配置了该项目：

val options = FirebaseOptions.Builder()
        .setProjectId("my-firebase-project")
        .setApplicationId("1:27992087142:android:ce3b6448250083d1")
        .setApiKey("AIzaSyADUe90ULnQDuGShD9W23RDP0xmeDc6Mvw")
        .build()

参数的值可以从第二个项目的google-services.json文件中获得。（注意：不要在项目中包含第二个项目的google-services.json)

google-services.json到手动代码映射

null

val app = Firebase.initialize(this, options, "ANY_FIXED_STRING_EXCEPT_DEFAULT")

val firebaseMessaging = app.get(FirebaseMessaging::class.java) as FirebaseMessaging

ymFirebaseMessaging.token.addOnCompleteListener{
                if (!it.isSuccessful) {
                    Log.d(TAG, "Fetching FCM token failed", it.exception)

                    return@addOnCompleteListener
                }


                val token = it.result
                Log.d(TAG, "YM: $token")
                Toast.makeText(
                    activity,
                    "$TAG: Got token",
                    Toast.LENGTH_LONG
                ).show()
}