How can I create an intent in my app to send a message through Hangouts and Yahoo Messenger?

Question

I am trying to create two separate buttons and separate intents to send a message through Hangouts and through Yahoo Messenger. Is there a way to open the chat window for a certain user if I know the user's id and email? I did this for Facebook Messenger using

Uri fbUri = Uri.parse("fb://messaging/" + userid);
    Intent fbIntent = new Intent(Intent.ACTION_VIEW, fbUri);

Thank you!