Could be a bug, after I send and SMS the LAST_TIME_CONTACTED field is not updated

Contacts have a field called LAST_TIME_CONTACTED, it is updated with the time after you make a call.

But as I noticed when I send an 开发者_如何学PythonSMS by the inbuilt Messaging app, it does not update. Could this be a bug?

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Could it be? Sure. It could also be that this is by design. The documentation for LAST_TIME_CONTACTED does not stipulate under what circumstances it is supposed to be updated.

Feel free to file an issue on the Android issue tracker -- if it is a bug, that is the best way to let them know about it.