A while ago I got a question if 3-level expandable list views can be
implemented in Android. Android does not explicitly support it but the
flexibility of Android UI widget framework provides a relatively simple
implementation option: second-level expandable list views are to be
inserted into the first-level expandable list view as child views. There was a blog post with an example program and
everybody was happy. Even then I made a note that I don't agree with
the approach from the UI point of view because the display becomes
unnecessarily messy.
Now there was a comment at that blog post whether 4-level lists are possible. Of course they are possible, it is just not a good UI design. But I guess, you better try it yourself if you don't believe me. The principle is the same (expandable lists embedded as children of higher-level expandable lists), it is just much more complex to make sure that everything is recalculated correctly for every event. In order to follow the operation, I left a good amount of debugging code in the project.
Click here to access the example program.
Now there was a comment at that blog post whether 4-level lists are possible. Of course they are possible, it is just not a good UI design. But I guess, you better try it yourself if you don't believe me. The principle is the same (expandable lists embedded as children of higher-level expandable lists), it is just much more complex to make sure that everything is recalculated correctly for every event. In order to follow the operation, I left a good amount of debugging code in the project.
Click here to access the example program.
4 comments:
ok so I've seen your code for the 3 level list and 4 one, however what I wanted to try is to close an opened level when another of the same level is already opened (this when on groupclicked).
- Red
- red1
-red11
- red2
-red22
-red23
So red 1 and red 2 cannot be opened at the same time. I attempted this but somehow I get an arrayindexoutofbounds when handling the groupclicked and the list.closegroup(x) :S .. how cold I fix this?
I want to check-box at 2nd and 3rd level. when we checked any parent check-box then all child of that check-box(Level) should be checked and vice versa. Please Help me.
how to trigger the click event for the childs i implemneted the onchildclick listener but it didnt worked.....plz plz plz help me out with that
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