ListView selection color is highlighting every 5th item in list

codo · March 31, 2020, 10:27pm

When selecting an item from ListView, every 5th item down the list is also being highlighted.

Note: List is a little over 200 items long.

TIMAI2 · March 31, 2020, 10:43pm

Yes, I can confirm that behaviour. Nice bug! The gap between “selections” seems to be dependent on the height of the listview. In test if listview is set to fill parent the gap between highlighted selections is 12 on my emulator, if set to 300 px high then the gap is 6. Affects both sizings and themes. The listview selection (the item touched) is returned correctly in listview.selection. Also happens if selection is set in the designer.

@codo this is probably related to the recent update where changes were made to allow programmatic selection in the listview…

codo · March 31, 2020, 10:54pm

Thanks! Perhaps a temporary workaround for better user experience is to temporarily not have a selection color… or to have the listView reset soon after selecting so that users don’t see the repeat.

TIMAI2 · March 31, 2020, 11:08pm

See also this thread on the old forum for ideas

https://groups.google.com/forum/#!searchin/mitappinventortest/timai2$20listview$20color|sort:date/mitappinventortest/Kt75jt6svVk/wc3lDcdwEQAJ

ABG · April 19, 2020, 10:02pm

(added to FAQ)

TIMAI2 · July 24, 2020, 11:47am

I thought this was fixed ? I recently re-compiled an old app (which was previously built before n183, there no highlighting bug) only to find I now had the highlighting bug in a long listview.

Still assigned to @ewpatton

TIMAI2 · July 27, 2020, 10:56pm

@ewpatton

Any news on this ?

Patryk_F · July 31, 2020, 7:14pm

In n184 this error continues...

Patryk_F · August 17, 2020, 8:50pm

I found out that the patch has not yet been implemented.

TIMAI2 · August 17, 2020, 9:07pm

@elatoskinas any work being done with this ?

Patryk_F · August 18, 2020, 6:00pm

Yes here: https://github.com/mit-cml/appinventor-sources/pull/2170

Jancior · May 8, 2021, 3:34pm

Hi, any progress with this one? I'm able to send my code to replicate this issue if needed.

Patryk_F · May 8, 2021, 3:47pm

There will be a fix in the summer.

TIMAI2 · May 8, 2021, 3:50pm

wishful thinking

I have "bumped" the cml page:

github.com/mit-cml/appinventor-sources

Error in ListView component. Multiple selection of an item in the list.

opened 08:29PM - 17 Aug 20 UTC

patryk84a

bug status: new

**Describe the bug** After selecting one item in the list, more items are che…cked (highlighted). This only happens when the list is longer and scrolls. Link: https://community.appinventor.mit.edu/t/listview-selection-color-is-highlighting-every-5th-item-in-list/6117 **Affects** - [ ] Designer - [ ] Blocks editor - [x] Companion - [x] Compiled apps - [ ] Buildserver - [ ] Debugging - [ ] Other... (please describe) **Expected behavior** When selecting one item on the list, only one should be selected. **Steps to reproduce** - add ListView to the project, - add a list of any 6 elements, - reduce the height of the list to around 100px - compile the application or connect via companion, - select any item from the list - scroll through the list to see that more list items are selected

Patryk_F · May 8, 2021, 3:52pm

Hopefully a new ListView created by @Susan_Lane will be implemented.

TIMAI2 · May 8, 2021, 6:44pm

Apparently this will be implemented in the next release n187, in September (no year specified)

Luis_Azuaga · June 30, 2021, 11:50am

On another platform derived from AI2 but not AI2, I found that they had no function implemented to display the selected item from the list.

Fortunately, apparently there the list of elements is passed by reference so that modifying the original list could show some characters in the selected element.

I have tried to move the procedure to AI2 but here the ListView.Elements property has to be of a type other than list and it does not work correctly but a similar effect can be obtained with the following code. The final two instructions of the highlight function would have to be activated.