My mom told me that when she tried to potty train my younger brother he did the same kind of things that you are describing. The thing that eventually worked for him was my grandmother bribing him with "big boy underwear"...She bought him these Batman underwear and told him that only big boys wore underwear like that, and that big boys don't potty in their pants. That was all it took for him. So, when I started to potty train my oldest boy (right after he turned 2), grandma did the same thing to him, too...She showed up at our house with some special Blues Clues underwear (Blue was his favorite at the time) and gave him the same story she gave my brother...and it worked for him, too! I was amazed. Then it was time to train my youngest...I thought I would be slick and try Grandma's trick...and it didn't work! I tried everything! The underwear, the special potty chair, stickers, the little floaty things you put in the toilet (targets)...nothing worked. The pediatrician suggested we send him to the bathroom when we had to go...and that is what ended up working. We made trips to the bathroom together, as wierd as that sounds.
The one thing that my pediatrician really stressed was not to push the issue. She said that it would take longer if we forced him to go to the bathroom. I always made him go in the bathroom with me or with his brother, but I never made him sit down on the toilet and go- he worked up to that on his own within a week or two.