Android Question check custom listview items visibility

Discussion in 'Android Questions' started by KZero, Feb 16, 2015.

  1. KZero

    KZero Active Member Licensed User

    Hello,

    i have custom listview with so many items

    how to know which items are visible on screen now and which items are offscreen

    i want to know that to reduce the memory usage by freeing up the Bitmaps from each offscreen item

    thanks
     
  2. eurojam

    eurojam Well-Known Member Licensed User

    Kzero,
    may be you can extend the CustomListView Class with a Scrollposition - feature. The CustomListView is based on a Scrollview which has this feature. You have to insert something like this in the class module:
    Code:
    Public Sub GetScrollposition As Int
      
    Return sv.ScrollPosition
    End Sub
    Hope this helps
    stefan
     
    KZero likes this.
  3. KZero

    KZero Active Member Licensed User

    this is a good idea but what about if i have variant item heights ?
     
  4. eurojam

    eurojam Well-Known Member Licensed User

    just an idea: you can loop through your panels from the beginning of your listview and add the panelheights. If your sum is less then your scrollpos they will be unvisible....and the same for the end of your list

    stefan
     
    KZero likes this.
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