Unity安卓端Firebase函数无法调用问题求助

Hey there, let's work through this silent Firebase failure issue you're hitting in Unity on your LG G2 mini. I've dealt with similar head-scratching problems before, so here are targeted steps to diagnose and fix it:

1. Force Wait for Firebase Initialization #

Firebase in Unity relies on asynchronous dependency setup, and accessing services like FirebaseAuth.DefaultInstance before initialization completes can cause silent hangs. Replace your Awake method with a coroutine that explicitly waits for Firebase to be ready:

private IEnumerator Start()
{
    // Wait for Firebase dependencies to resolve
    var dependencyTask = FirebaseApp.CheckAndFixDependenciesAsync();
    yield return new WaitUntil(() => dependencyTask.IsCompleted);

    if (dependencyTask.Status != DependencyStatus.Available)
    {
        Debug.LogError($"Firebase dependency failure: {dependencyTask.Status}");
        yield break;
    }

    // Now run your original setup code
    UserNameInput.text = "demofirebase@gmail.com"; 
    auth = FirebaseAuth.DefaultInstance; 
    PasswordInput.text = "abcdefgh"; 
    FirebaseApp.DefaultInstance.SetEditorDatabaseUrl("https://testproject-69c2c.firebaseio.com/"); 
    reference = FirebaseDatabase.DefaultInstance.RootReference; 
    SignupButton.onClick.AddListener(() => Signup(UserNameInput.text, PasswordInput.text)); 
    LoginButton.onClick.AddListener(() => Login(UserNameInput.text, PasswordInput.text)); 
}

This ensures you don't try to access Firebase services until all underlying dependencies are fully loaded.

2. Dig Into Android Logcat #

Silent failures almost always leave clues in the Android system logs. Use adb logcat (or Android Studio's Logcat tool) to filter for Firebase/Unity-related messages:

adb logcat -s Firebase Unity AndroidRuntime

Look for errors like missing dependencies, initialization timeouts, or permission issues—these won't show up in the Unity Editor but will be visible here.

3. Verify SDK & Unity Compatibility #

Double-check that your Firebase Unity SDK version works with your current Unity version. If you updated either recently, you might have hit a compatibility gap. Try rolling back to the exact SDK version that worked for you before, or confirm you're using the latest SDK that supports your Unity version. Also, make sure you didn't miss any required Firebase packages (Auth, Database, and their core dependencies) during import.

4. Check Android Manifest & Config Files #

• Ensure your Assets/Plugins/Android/AndroidManifest.xml includes the internet permission (sometimes stripped during build):

  <uses-permission android:name="android.permission.INTERNET" />
  

• Confirm your google-services.json is in the correct folder (Assets/Plugins/Android) and matches your Firebase project's package name and credentials.
• Verify your Unity project's package name (Edit > Project Settings > Player > Android > Package Name) exactly matches the one registered in your Firebase console.

5. Account for Old Device Limitations #

The LG G2 mini runs Android 4.4 (KitKat), which might not support newer Firebase SDK features. Check the Firebase SDK docs for the minimum Android API level required—if your SDK is too new, roll back to a version that supports Android 4.4. Also, ensure "Internet Access" is set to Require in Unity's Player Settings (Edit > Project Settings > Player > Android > Other Settings).

6. Test on a Different Device/Emulator #

Build and run the app on a newer Android device or emulator. If it works there, the issue is specific to the LG G2 mini's hardware/software. You might need to adjust Firebase settings or add fallback logic for older devices.

内容的提问来源于stack exchange，提问作者Theodor Savransky