Flutter Instance of 'Future<Translation>' i keep getting this on my print-CodePudding

i trying to translate a string and show it to my screen but when i try to check the text on print it say Instance of Future<Translation>

this is my code when i try to use then(print)

 final finalLastSeen = translator
            .translate(timeago.format(userLastSeen), from: 'en', to: 'id')
            .then(print);

it show the string that i want. but when i make this

 final finalLastSeen = translator.translate(timeago.format(userLastSeen),
            from: 'en', to: 'id');

        print(finalLastSeen);

it will show the Future error

this is my whole FutureBuilder Code

 return FutureBuilder(
      future: users.doc(product.userId).get(),
      builder:
          (BuildContext context, AsyncSnapshot<DocumentSnapshot> snapshot) {
        if (snapshot.hasError) {
          return const Text("Something went wrong");
        }

        if (snapshot.hasData && !snapshot.data!.exists) {
          return const Text("Document does not exist");
        }

        if (snapshot.connectionState == ConnectionState.done) {
          Map<String, dynamic> data =
              snapshot.data!.data() as Map<String, dynamic>;
          _sellerImageurl = '${data['imageUrl']}';
          _sellerName = '${data['name']}';
          _sellerJoinedDate = '${data['createdAt']}';
          _sellerCity = '${data['location']}';
          _sellerStatus = '${data['status']}';
          _sellerLastSeen = '${data['lastSeen']}';
        }

       final DateTime lastSeen = DateTime.parse(_sellerLastSeen);
        final Duration _sellerTimePassed = time.difference(lastSeen);
        final userLastSeen = DateTime.now().subtract(_sellerTimePassed);
        final _userOffline = '';
        print(timeago.format(userLastSeen));

          final finalLastSeen = await translator.translate(timeago.format(userLastSeen),
              from: 'en', to: 'id');

          print(finalLastSeen);


        return product_details_layout(
          cartProvider: cartProvider,
          product: product,
          productId: productId,
          wishListProvider: wishListProvider,
          sellerImageurl: _sellerImageurl,
          sellerName: _sellerName,
          sellerCity: _sellerCity,
          sellerStatus: _sellerStatus,
          userOffline: _userOffline,
          productList: productList,
          sellerJoinedDate: _sellerJoinedDate,
        );
      },
    );
``

CodePudding user response：

The translate is an async function.

The then is waiting for the translate function to complete and return your Translation.

In the second case, you have no then so you are not waiting for it to complete and you just have a Future<Translation.

You can do this instead:

final finalLastSeen = await translator.translate(timeago.format(userLastSeen),
            from: 'en', to: 'id');
print(finalLastSeen);

The await will make sure you are waiting for the function to complete before you call the print.

CodePudding user response：

You should take care of async/await. Please take look at here. If you are getting printed like Instance of Future<anything> that means you are not waiting for the asynchronous to fulfill. Your code should look like this.

/// for printing promise result
translator.translate(timeago.format(userLastSeen), from: 'en', to: 'id')
            .then(print);
/// or by await
final finalLastSeen = await translator
            .translate(timeago.format(userLastSeen), from: 'en', to: 'id');
print(finalLastSeen);

/// inside widget you can use FutureBuilder
widget(
 child: FutureBuilder(
    future: translator.translate(timeago.format(userLastSeen), from: 'en', to: 'id'),
    builder: (BuildContext context, AsyncSnapshot<String> snapshot) => snapshot.hasData ? Text(snapshot.data):Text("Waiting...")
  )
)

CodePudding user response：

You can see some example from the Translator package example.

So, if you want to have the string as result, use async methode and put await keyword before translator.translate:

void myMethod() async {
  final finalLastSeen = await translator.translate(timeago.format(userLastSeen), from: 'en', to: 'id');
  print(finalLastSeen);
}