CODEWITHSUNDEEP
androidcollision-detection
Foxx
Foxx

Reputation: 43

Collision Detection In Android

Ok, so whats the best way to detect collisions in Android? The only examples I can find on it all involves finding when the two objects are directly over each other. Personally I was thinking about using bounding boxes, but even that I do not know how to do, and then I still desire something a little more precise (per-pixel?).

Upvotes: 2

Views: 4888

Answers (3)

David Shellabarger
David Shellabarger

Reputation: 1533

edthethird is almost right.

You want to use to myRectHitbox.intersect(myOtherRectHitbox) instead of . contains(...). .contains(...) will only tigger if the one Rect is completely inside another but .intersect(...) triggers if there is any pixel that overlaps another.

And if you use RectF instead of Rect you will get subpixel accuracy on devices that support subpixels.

Upvotes: 3

edthethird
edthethird

Reputation: 6263

Two Steps:

  1. Give everything that can collide a "hitbox". Keep a Rect in your objects, the same size as the drawable and at the same place.

  2. Call one of the three myRectHitbox.contains(...). You can check collisions on points or rects this way.

Upvotes: 1

Jesus Oliva
Jesus Oliva

Reputation: 2302

If you are not an expert on this subject, I recommend you to use the Box2d library to do it. It is a very complete physics engine with very good support for collisions detection.

Useful link: http://www.4feets.com/2009/03/2d-physics-on-android-using-box2d/

Upvotes: 2

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