Are both "How did you" and "Howdja" used?

How did you get here? [ ‘haʊ dɪdʒʊ ‘gɛt hɪər? ]
I took the bus.

How did you get here? [ ‘haʊdʒə ‘gɛt hɪər? ]
I took the train.

My question: are both “haʊ dɪdʒʊ” and “haʊdʒə” used in American English? I think that “haʊdʒə” is more informal, but I think both mean the same thing. Am I right?