The landlord sent me a 30-day Notice by text message is that legal in California?

On July 7th, 2013 my landlord that I share a rental with sent me a text message while he was in Mexico stating he needed the room back. I responded back by text when he needed it by so I can have it ready for him and he said next month. There is no lease this was all by verbal agreement. I have been renting since October of 2012 with checks made out to him since that I have payed rent. What can I do? I have to get out ASAP..the 1st of August is 2 days away!