It is clear given its name (but unfortunately not documented). Index = index of a view inside the gallery Position = index of an item inside the adapter
Note the use of the words "index" and "position." They do not mean the same thing. On Mon, Sep 14, 2009 at 1:48 PM, Tikoze <[email protected]> wrote: > >>pointToPosition() does exactly what it was meant to do: it converts a >> point to a position, that is an index inside your adapter > > I never said it didn't, once I understood its purpose. It just wasn't > clearly documented that it returns an index to the adapter (which is a > different object) and I don't think it is a clear choice to have that > be the return value when the Gallery itself displays Views that are a > subset of the adapter. If the documentation stated that was the case, > or if the method name were a little more clear (perhaps > pointToAdapterPosition) then the purpose of the method would be more > obvious. Since the method is on the Gallery class I expected the > return value to be pertinent to its particular instance, not to the > instance of the adapter that is associated with it. > >> And it would be a terrible API on the Adapter itself. > > Point taken. > > On Sep 14, 2:13 pm, Romain Guy <[email protected]> wrote: >> pointToPosition() does exactly what it was meant to do: it converts a >> point to a position, that is an index inside your adapter. And it >> would be a terrible API on the Adapter itself. >> >> To get the index of a view using pointToPosition() just subtract >> getFirstVisiblePosition(). >> >> On Mon, Sep 14, 2009 at 1:01 PM, Justin Anderson >> >> >> >> <[email protected]> wrote: >> > I think we are going to have to agree to disagree on this one. :) >> >> >> You are confusing views and items from the adapter. >> >> > I don't believe I am. Initially I did not realize that theGalleryonly has >> > visible items as children. I understand that now. AFAICT, this was not >> > documented anywhere... Hence the confusion. >> >> >> > If I have 20 items, and scroll to the 16th... then that means items 14 - >> >> > 18 >> >> > are visible. Which in turn means that according to thegallerythe item >> >> > at >> >> > position 0 is really the 14th and the item at position 5 is really the >> >> > 18th? If that is the case, what can I do to get the view I want? >> >> >> No, it means the View at index 0 shows the data of the item at >> >> position 14 in your adapter. >> >> > That is what I meant... I just didn't describe it as well as you did. >> >> > I believe that since thegallerydeals with displaying views and the >> > pointToPosition() method deals with a point on the screen that it should >> > return the index of the view at that point, rather than the index of the >> > data array. I think it would be better to have that functionality on the >> > adapter, rather than thegallery. >> >> > Thank you for your help. It has helped me understand how things work and I >> > now know how to proceed to get the results I want. >> >> > Thanks, >> > Justin >> >> > On Mon, Sep 14, 2009 at 1:25 PM, Romain Guy <[email protected]> wrote: >> >> >> You are confusing views and items from the adapter. >> >> >> > If I have 20 items, and scroll to the 16th... then that means items 14 - >> >> > 18 >> >> > are visible. Which in turn means that according to thegallerythe item >> >> > at >> >> > position 0 is really the 14th and the item at position 5 is really the >> >> > 18th? If that is the case, what can I do to get the view I want? >> >> >> No, it means the View at index 0 shows the data of the item at >> >> position 14 in your adapter. You can use getFirstVisiblePosition() to >> >> convert back and forth between index and positions. >> >> >> -- >> >> Romain Guy >> >> Android framework engineer >> >> [email protected] >> >> >> Note: please don't send private questions to me, as I don't have time >> >> to provide private support. All such questions should be posted on >> >> public forums, where I and others can see and answer them >> >> -- >> Romain Guy >> Android framework engineer >> [email protected] >> >> Note: please don't send private questions to me, as I don't have time >> to provide private support. All such questions should be posted on >> public forums, where I and others can see and answer them > > > -- Romain Guy Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en -~----------~----~----~----~------~----~------~--~---
