Backcourt violation?

[DKaiser]

Had this play tonight, just checking on the correct ruling. A1 is taking ball out of bounds near half court after a violation by team B. A1 bounce passes ball towards A2 who is breaking towards the midcourt line. As the ball bounces upward it clearly travels across the midcourt plane. A2 retrieves the ball at its apex with his left foot in the backcourt and his right foot in the front court. After posession, he begins to dribble and brings that right foot into the backcourt so now all three (ball, left foot, right foot) are there. Backcourt violation? What if he would have went the other way and brought ball and left foot into frontcourt on the dribble?