I have a listview, how can i display duplicate items in that listview

MIT App Inventor Help
1

i have a listview, how can i display duplicate items in that listview

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272e76197111a84ff100859×1908 292 KB

2

One way would be to search the List you use to populate the ListView for the first item in the List and compare it to all the other items in the ListView. If no matches, search for the second item in the List and compare. Keep doing the search for all the items in the ListView . Use the for each item in list Block

The section 6. Search for an Item in List Blocks On App Inventor | Imagnity should provide you with some ideas.

Are there easier ways to find all the duplicate items (if any). Possibly, but I am not aware of one.

3

There are many ways to iterate the list to find the dulicated item.
following is one of them using dictionary:

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4

Here is a code snippet to filter duplicates - you will find a handful of other code snippets for ListView too:

https://www.professorcad.co.uk/appinventorsnippets#ListFilterDuplicates