what does gcm.notification.e=1 stand for, into push notification payload on Android?
问题 I'm writing an Android application which receives downstream messages from a server using Google Cloud Messaging. When receiving a message with onMessageReceived I print the bundle and read this: RECEIVED PUSH NOTIFICATION: Bundle[{gcm.notification.e=1, gcm.notification.badge=1, gcm.notification.sound=default, ..etc... I don't understand the key gcm.notification.e in the notification payload. On Google documentation I didn't find anything like that. Moreover, when sending the message, I