https://pub.dev/packages/firebase_messaging firebase_messagingにてonBackgroundMessageを使うときは、 TOP-LEVEL か STATIC の関数しか使えない。 ○呼べる関数について TOP-LEVELとはクラスから出てるような関数。STATICはその名の通りstaticついてるや…

FAILURE: Build failed with an exception. * What went wrong: Could not determine the dependencies of task ':app:compileReleaseKotlin'. > Failed to install the following Android SDK packages as some licences have not been accepted. build-too…