[Mobile] Text message intent

[awallin]

On Android requests to compose and send a text message should open and execute in the phone's default messaging app.

Examples of intents for messaging include:

Text Mom
Write a text to John Smith saying see you at the market
Text Be home in 5 minutes to (415) 857-5309

When no message is specified (e.g. "text Kelly") the assistant should find and display the matching contact (see #1465 for multiple matches) and then be available for dictation to allow voice input. Once voice input is complete based on silence detection "Send" or "change" are available commands.

In the case where a contact has multiple phone entries (e.g. home, mobile, office) the mobile entry should be chosen as the default (if an entry wasn't specified). The UI can display additional entries allowing the user to tap if they wish to change.

[awallin]

@espertus I've started thinking about this one. Questions for you.

• Can we detect what messaging apps are available on the phone (whats app, FB messenger, etc)?
• If so, can we detect/match contacts in those apps?
• Can we understand which messaging app is used most frequently by the user?
• From the default messaging app can we understand which contact are messaged frequently?