<!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->

​

​

<application

    android:name="io.flutter.app.FlutterApplication"

    android:label="When Coin"

    android:icon="@mipmap/ic_launcher">

<meta-data

   android:name="com.google.firebase.messaging.default_notification_icon"

   android:resource="@mipmap/ic_stat_ic_notification" />