Ok. That makes sense. Thanks for the clarification! On Mon, Sep 14, 2009 at 3:00 PM, Romain Guy <[email protected]> wrote:
> > 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. 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