FB：//消息/ {#user_id}
 

您可以使用此URI与已知ID的朋友开的消息。

您可以开始像下面的意图

  startActivity（新意图（android.action.VIEW，FB：//消息/ {#user_id}））;
 

I've seen other topics like this: launch facebook app from other app and tried some of the URIs listed there, but I can't figure out how to start the facebook chat with a specific friend.

Is there an official page that describes the IntentUriHandler and all the allowed URIs with their params?

Thanks, Lorenzo

fb://messaging/{#user_id}

you can use this URI to open messaging with a friend with known id.

You can start the intent like below

startActivity(new Intent(android.action.VIEW, "fb://messaging/{#user_id}"));