I am implemnting an app that can tag photos The listview-items contain 3 image-buttons and a text.
If user long-taps on a list-view-item-button there will be additional functionality (menu or dialog).
Is there a standard/idea or some lib-functionality that can put a visual clue/hint on long-tappable items so that the user knows that he/she can do more?
On windows there is the convention that "..." means open a dialog/submenu with additional choises.
i am looking for some convention / lib-functionality that tells the user about that "long-tap" is available.
I will also put a description into the online-manual but from server access log i can see that nearly nobody reads it.