used this particular patent to get the idea or work out how to implement it
A patent protects the invention, not the text of the patent. The more realistic question is whether HTC's implementation was worked out by looking at how the feature works on iOS.
I'd bet it wasn't. I saw this sort of thing shown off as one of the advantages of Android's Intent system (e.g. highlighting a URL or phone number in a note-taking app) at a developer event months before the G1's release.
So far as I understand, iOS doesn't have the same sort of Intent architecture, so it seems unlikely that that Google's implementation drew any inspiration from iOS (especially as the same sort of thing has been done in web browsers for years to the point where a browser might be prior art).
A patent protects the invention, not the text of the patent. The more realistic question is whether HTC's implementation was worked out by looking at how the feature works on iOS.