I develop a game in android. I able to find collision between two object. But i need to find collision only when two object collided(Not in blank space of image)In j2me ,i able to make that.

Sample code: helicopterSprite.collidesWith(buildingSprite, true)

But in Andengine , having only helicopterSprite.collidesWith(buildingSprite) . How i make in android

Which method should i use for pixel level collision ? Any examples ?