Tooltips in the era of touch

problem ：

Tooltips are an incredibly useful interface paradigm to know an application. Tooltips are useful interface examples for understanding applications .They are the mapping between the visual control and the application specific action associated to that control. They are mappings between a visual control and the application specific actions associated with that control .The user can explore the action without invoking it just by hovering the mouse pointer. The user can explore the operation by hovering the mouse pointer without invoking it .

The touch devices make this paradigm basically impossible. Touch devices make this paradigm virtually impossible .This limits the usability of the app, which becomes in some cases pretty mysterious. This limits application availability , This becomes very mysterious in some cases .

Do you know if a substitute for the tooltip concept exists for touch devices? Do you know if there are alternatives to the tooltip concept for touch devices ？They effectively lack one degree of freedom in ui interaction: the pointer position. They are ui Interaction actually lacks a degree of freedom ： Pointer position .How to regain this communication channel effectively? How to effectively regain this communication channel ？

---

Solution ：

Reference resources ： https://stackoom.com/en/question/7I4b