Errors list<String> is not a subtype of type <String>

Question

// I am trying this code and it is not adding to the firebase

void checkItemInCart(String shortInfoAsId, BuildContext context) {
  EcommerceApp.sharedPreferences
          .getString(EcommerceApp.userCartList)
          .contains(shortInfoAsId)
      ? Fluttertoast.showToast(msg: "Item already in Cart.")
      : addItemToCart(shortInfoAsId, context);
}

addItemToCart(String shortInfoAsId, BuildContext context) {
  List tempCartList =
      EcommerceApp.sharedPreferences.getStringList(EcommerceApp.userCartList);
  tempCartList.add(shortInfoAsId);

  EcommerceApp.firestore.collection(EcommerceApp.collectionUser)
      .document(EcommerceApp.sharedPreferences.getString(EcommerceApp.userUID))
      .updateData({
    EcommerceApp.userCartList: tempCartList,
  }).then((v){
    Fluttertoast.showToast(msg: "Item Added to Cart Successfully");

    EcommerceApp.sharedPreferences.setStringList(EcommerceApp.userCartList, 
tempCartList);

    Provider.of<CartItemCounter>(context, listen: false).displayResult();
  });
}

// it is giving these errors

The following _TypeError was thrown while handling a gesture: type 'List' is not a subtype of type 'String'

When the exception was thrown, this was the stack: #0 SharedPreferences.getString (package:shared_preferences/shared_preferences.dart:98:35) #1 checkItemInCart (package:e_shop/Store/storehome.dart:331:12) #2 sourceInfo. (package:e_shop/Store/storehome.dart:301:31) #3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19) #4 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:1111:38) ... Handler: "onTap" Recognizer: TapGestureRecognizer#47ccb debugOwner: GestureDetector state: ready won arena finalPosition: Offset(380.3, 334.6) finalLocalPosition: Offset(22.8, 31.6) button: 1 sent tap down

could you tell me where this error shows up? in which line?

Theepag
– Theepag

2021-03-14 15:45:12 +00:00
Commented Mar 14, 2021 at 15:45 — Theepag
– Theepag, Commented Mar 14, 2021 at 15:45
that is the whole error it is not telling me at which line.

Maroun Saade
– Maroun Saade

2021-03-15 11:32:41 +00:00
Commented Mar 15, 2021 at 11:32 — Maroun Saade
– Maroun Saade, Commented Mar 15, 2021 at 11:32
It's saying that error in 98th line

Theepag
– Theepag

2021-03-15 15:12:51 +00:00
Commented Mar 15, 2021 at 15:12 — Theepag
– Theepag, Commented Mar 15, 2021 at 15:12

Biruk Telelew · Accepted Answer · 2021-03-14 15:48:35Z

1

the problem is in .getString(EcommerceApp.userCartList) you have to set an index to it because EcommerceApp.userCartList returns a list use it something like this

.getString(EcommerceApp.userCartList[0])

answered Mar 14, 2021 at 15:48

Biruk Telelew

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3 Comments

Maroun Saade Over a year ago

I tried it and it is giving me this error:

Maroun Saade Over a year ago

The method 'contains' was called on null. Receiver: null Tried calling: contains("Phone : Samsung Galaxy note 10 12GB RAM 128GB")

Biruk Telelew Over a year ago

it is because EcommerceApp.userCartList[0] returns "Phone : Samsung Galaxy note 10 12GB RAM 128GB" this value and there is no value in the EcommerceApp.sharedpreferences with that name so check if the name that you stored and trying to get is the same.

Maroun Saade · Accepted Answer · 2021-03-15 12:08:37Z

0

thanks all for helping. all I needed to do is change the getString to getStringList

an now it is working.

answered Mar 15, 2021 at 12:08

Maroun Saade

112 bronze badges

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