Flutter运行报错：Firebase Auth使用或重写已弃用API

Hey there, let's clear up what's going on here first—those lines are warnings, not actual errors, so your app should still run just fine despite the messages. Here's why you're seeing them:

• The firebase_auth plugin version 0.5.10 (which is compatible with your Flutter 0.4.4 beta) has Android-side code (FirebaseAuthPlugin.java) that uses or overrides APIs from the Firebase Android SDK that were already marked as deprecated at the time. This isn't a problem with your version pairing—this is just the plugin's internal implementation relying on older Firebase SDK methods that hadn't been updated yet in that specific plugin release.
• The note is just a heads-up from the Java compiler telling you there's outdated code in the plugin, but those deprecated APIs still work (they're just scheduled for removal in future Firebase SDK versions).

If you want to see exactly which APIs are deprecated, you can follow the compiler's suggestion:

1. Open your Flutter project's Android module in Android Studio.
2. Add the -Xlint:deprecation flag to your app's build.gradle file under the android > compileOptions section, like this:

   android {
       compileOptions {
           sourceCompatibility JavaVersion.VERSION_1_8
           targetCompatibility JavaVersion.VERSION_1_8
           options.compilerArgs << "-Xlint:deprecation"
       }
   }
   

3. Recompile the Android module, and you'll get detailed logs pointing to the specific deprecated methods in the FirebaseAuthPlugin.java file.

At the end of the day, this warning doesn't break your app. If everything is working as expected, you can safely ignore it. If you really want to eliminate the message, you'd either need to wait for an updated version of the firebase_auth plugin that replaces those deprecated APIs, or modify the plugin's source code yourself (though that's not recommended unless you're comfortable with Android development).

内容的提问来源于stack exchange，提问作者Chris