Android gcm通知有效负载与数据负载？

Question

根据https://developers.google.com/cloud-messaging/server-ref gcm消息可以有通知有效负载或/和数据有效负载这两者有什么区别？

Answer 1

Reading on the link you send it is explained under Payload section

Payload

Optional. If you are including a payload in the message, you use the data parameter to include your custom key/value pairs. The client app handles the data payload for display or other processing purposes.

The notification parameter with predefined options indicates that GCM will display the message on the client app's behalf if the client app implements GCMListenerService on Android, or if the notification message is sent to an iOS device. This applies for both HTTP and XMPP.

The app server can send a message including both notifications and data payloads. In such cases, GCM handles displaying the notification payload and the client app handles the data payload.

See the Server Reference for details on sending and receiving messages.

Answer 2

You may find this explanation more helpful

Use scenario

Notification: GCM automatically displays the message to end user devices on behalf of the client app. Notifications have a pre-defined set of user-visible keys.

Data: Client app is responsible for processing data messages. Data messages have only custom key/value pairs.

How to send

Notification: Set notification payload. May have optional data payload. Always collapsible.

Data: Set data payload only. Can be either collapsible or non-collapsible.

https://developers.google.com/cloud-messaging/concept-options?hl=en