问题
Is there a TTL or expiration or some sort of timeout feature for C2DM messages?
I would like the C2DM message to be received within 10 minutes by the device, any longer (ie: if their phone is off) and the C2DM message should not be received by the device.
I could probably implement something in the device to ignore any C2DM messages if they are old, but I'm not sure how accurate that would be with different device time settings.
A TTL flag on the C2DM message sent to google would be perfect, but not sure if they support this.
Cheers! Dave
回答1:
C2DM does not have such a feature. Please have a look here:
how to set valid time period for android c2dm message?
Update:
Google just released a new version of c2dm called "Google Cloud Messaging (GCM)". With GCM it is possible to use a timeout for your messages:
I really recommend the Google I/O 2012 "Google Cloud Messaging for Android" session available here: http://www.youtube.com/watch?v=YoaP6hcDctM
Additionally you can read through the GCM ttl section: http://developer.android.com/guide/google/gcm/adv.html#ttl
来源：https://stackoverflow.com/questions/8473918/how-to-set-a-timeout-expiration-on-a-c2dm-message