rebase\core\FlutterFirebaseCorePlugin.java uses or overrides a deprecated API. code example
Example 1: FlutterFirebaseCorePlugin.java uses or overrides a deprecated API.
in your android/app/build.gradle file set the minSdkVersion 21
Example 2: FlutterFirebaseCorePlugin.java uses or overrides a deprecated API.
minSdkVersion 23