next Page stream is not update on Flutter

Question

I used two pages. and I added StreamBuilder in my first page and I passed snapshot.data to next Page. but when value change in 2nd-page value is not changing. How to fix it? I can't call streamBuilder in both pages because it's meaning two read in firebase. Is there any way to create singleton for services and access anywhere?

StreamBuilder(
              stream: db.getData(),
              builder: (context,snapshot){
                return Column(
                  children: <Widget>[
                    InkWell(
                      onTap: ()=> Navigator.pushNamed(context, '/nextPage',arguments: Arguments(
                        data: snapshot.data
                      )),
                    )
                  ],
                );
              },
            )

Answer 1

InkWell(
  onTap: ()=> Navigator.pushNamed(context, '/nextPage',arguments: Arguments(
  data: snapshot.data
  ),
),

When using the above code, a data snapshot is only sent when you Tap on the InkWell. Meaning unless tapped on the inkwell it will not provide new data to nextPage.

To resolve this issue, I would suggest the following:

In First page

• Create ValueNotifier instance to observe changes in the common reference:

  // change Cast to type that you receive from firebase, or you can omit the cast 
 final ValueNotifier<snapshot_data_type> firebaseDataNotifier = ValueNotifier<snapshot_data_type>();

• Update the value of firebaseDataNotifier when you receive data from firebase:

 StreamBuilder(
           stream: db.getData(),
           builder: (context,snapshot){
             firebaseDataNotifier.value = snapshot.data;
             ...

• Pass the firebaseDataNotifier as data for the nextPage

In the next Page

• Wrap the Next page widgets with ValueListenable

  ValueListenableBuilder(
          valueListenable: valueNotifier,
          builder: (context, firebaseData, child) {
            // return your next page widget here and use firebaseData instead of snapshot.data
        )

Note: Make sure you keep the ValueNotifier instance outside of both widgets so that they can access it without any dependency.