How to shift focus to next textfield in flutter?

问题

I am new to Flutter.

I am building a form with multiple text inputs using following widgets: Form, TextFormField. The keyboard that appears doesn't show "next" (which should shift the focus to next field) field action instead it is "done" action (which hides the keyborad).

I looked for any hints in official docs, found nothing directly that can be done. I although landed on FocusNode(cookbook, api doc). It provides with mechanism to shift focus by some button or any other action on app, but I want it to be in keyboard.

回答1:

Found a way to achieve it.

1. Displaying Next Icon instead of Done - setting textInputAction parameter to TextInputAction.next

2. Using onFieldSubmitted callback to request focus node of next field.

   class FormWidget extends StatelessWidget{    
      final focus = FocusNode();
      @override
      Widget build(BuildContext context) {
       return Form(
         child: SingleChildScrollView(
           padding: EdgeInsets.symmetric(horizontal: 16.0),
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.stretch,
             children: <Widget>[
               TextFormField(
                 textInputAction: TextInputAction.next,
                 autofocus: true,
                 decoration: InputDecoration(labelText: "Input 1"),
                 onFieldSubmitted: (v){
                   FocusScope.of(context).requestFocus(focus);
                 },
               ),
               TextFormField(
                 focusNode: focus,
                 decoration: InputDecoration(labelText: "Input 2"),
               ),
             ],
           ),
         ),
       );
     }
   }
   

Edit: As stated in the documentation (flutter.io/docs/cookbook/forms/focus), - we also need to manage FocusNode lifecycle. So, init FocusNode in the init() method and dispose in dispose() of the parent Widget. - @AntonDerevyanko

来源：https://stackoverflow.com/questions/52150677/how-to-shift-focus-to-next-textfield-in-flutter