Question 120677 in Firebase Question posted in
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Why i cant see the values of my snapshot.value from firebase database in a Text widget in flutter?

i have the next code:

DatabaseReference ref = FirebaseDatabase.instance.ref();
  late DatabaseReference databaseReference;
  final data = FirebaseDatabase.instance.ref();
  var medsValues;

_activateListeners() {
    data.get().then((snapshot) {
      var medsDescription = snapshot.value;
      setState(() {
        medsValues = medsDescription;
      });
    });
  }    

ListView.builder(
                          itemCount: medsValues.length,
                          itemBuilder: (BuildContext context, int index) {
                            return ListTile(
                              leading: Icon(Icons.medication),
                              title: medsValues[index].forEach((key, value) {
                                key == "username" ? Text(value.toString()) : null;
                              }),
                            );
                          },
                        )

But if I change the Text() widget with a print() and print the value in console without the .toString(), this shows correctly, Can you help me please?

thanks for your help in advance

this is my DB in firebase Database:
enter image description here

Tags:

2

Answers


  1. 0

    it’s just a guess, but I believe you’re missing adding typing to your variables, try declaring

    Object medsValues;  
Object medsDescription = snapshot.value

    instead of

    var medsValues;
var medsDescription = snapshot.value

    Or try to create a class that represents your object and override the toString or access the attribute you want to display in Text()

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  2. 0

    I did not understand your question completely, also your code is not clean enough so please take a look at firebase documentations on how to retrieve snapshots from database. you should also await for your get() method to complete,
    for that consider using a StreamBuilder or FutureBuilder to get your snapshot(s) from the database.

    _activateListeners() async{
await data.get().then((snapshot) {
  var medsDescription = snapshot.value;
  setState(() {
    medsValues = medsDescription;
  });
});

    }

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