Demonstration of connecting the android app to an online wallet here
http://youtu.be/TSHYu0fCEAg 1. The wallet requests a master public key from the andoid app, after that a 2 of 2 wallet can be created.
2. User creates a payment and signs it in the online wallet (by using his passphrase)
3. Transaction is created, waiting for user to sign (for the second time) with the android app.
4. User signs with android app.