How to listen focus change in flutter?

Question

In Android, we can call setOnFocusChangeListener(), do something in onFocusChanged() method, but flutter does not provider onFocus() inter

Answer 1

In addtion you can use Focus widget.

Focus(
  child: TextFormField(...),
  onFocusChange: (hasFocus) {
    if(hasFocus) {
      // do stuff
    }
  },
)