type 'String' is not a subtype of type 'bool'

Question

I got an error message when I was trying to build an app that contains chat, the message is:

type 'String' is not a subtype of type 'bool'

a screenshot of the error message:

my code:

class Messages extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    User user2= FirebaseAuth.instance.currentUser;
    return FutureBuilder(
      // future: Future<String>.delayed(
      //   Duration(seconds: 2),
      //       () => 'Data Loaded',
      // ),
      //future: FirebaseAuth.instance.currentUser,
      builder:(ctx, futureSnapshot){
        if(futureSnapshot.connectionState==ConnectionState.waiting){
          return Center(child: CircularProgressIndicator());}
      return StreamBuilder(
      stream: FirebaseFirestore.instance.collection('chat').orderBy('createdAt',descending: true).snapshots(),
      builder: (ctx, chatSnapshot){
        if(chatSnapshot.connectionState== ConnectionState.waiting){
          return Center(child: CircularProgressIndicator(),);
        }

        if(chatSnapshot.hasData){
        final chatDocs=  chatSnapshot.data.docs;

            return ListView.builder(
              //key: ValueKey(chatDocs[index].docsID),
            reverse: true,
              itemCount:chatDocs.length,
              itemBuilder: (ctx, index)=> MessageBubble(
                  chatDocs[index]['text'],
                  chatDocs[index]['userId'],
                  //chatDocs[index]['userId'] ==futureSnapshot.data.udi,
                ValueKey(chatDocs[index].docsID),
              )
          );}
        else{
          return Text('عذرًا, هناك مشكلة');
        }
        },
        );
      },

    );
  }

Can anyone suggest a solution and tell me what should I do?

Answer 1

The problem is this line you commented here:

MessageBubble(
 chatDocs[index]['text'],
 chatDocs[index]['userId'],
 // chatDocs[index]['userId'] ==futureSnapshot.data.udi,
 ValueKey(chatDocs[index].docsID),
)

Why? Your Object MessageBubble has 4 positional arguments. The third one of them is isMe and expects a boolean. However, your passing the ValueKey (since they are positional).

Also, your not providing the 4º argument that is required since all positional arguments are required

 class MessageBubble extends StatelessWidget {
    final String messsage;
    final userID;
    final bool isMe;
    final Key key;
    MessageBubble(this.messsage,this.userID, this.isMe,this.key);

You could:

1. Either uncomment this line chatDocs[index]['userId'] ==futureSnapshot.data.udi or pass it another boolean value (true or false)

Answer 2

@MansiBhatt

MessageBubble class:

 class MessageBubble extends StatelessWidget {
      final String messsage;
      final userID;
      final bool isMe;
      final Key key;
      MessageBubble(this.messsage,this.userID, this.isMe,this.key);
    
      @override
      Widget build(BuildContext context) {
        return Row(
          mainAxisAlignment: isMe? MainAxisAlignment.start: MainAxisAlignment.end,
          children: [
            Container(
              decoration: BoxDecoration(
                color: isMe? Colors.grey[300]: nave,
                borderRadius: BorderRadius.only(
                  topLeft: Radius.circular(12),
                  topRight: Radius.circular(12),
                  bottomLeft: !isMe ? Radius.circular(12) : Radius.circular(0),
                  bottomRight: isMe ? Radius.circular(12) : Radius.circular(0),
    
                ),
              ),
              width: 140,
              padding: EdgeInsets.symmetric(vertical: 10,horizontal: 16),
              margin: EdgeInsets.symmetric(vertical: 4, horizontal: 8),
              child: Column(
                children: [
                  Column(
                    children: [
                      FutureBuilder(
              

      future: FirebaseFirestore.instance.collection('users').doc(userID).get(),
                    builder: (context, snapshot) {
                      if(snapshot.connectionState== ConnectionState.waiting){
                      return Text('جاري التحميل...');}
                      return Text(snapshot.data['username'], style: TextStyle(fontWeight: FontWeight.bold),);
                    }
                  ),
                ],
              ),
              Text(messsage, style: TextStyle(color: isMe? white : Colors.black,),),
            ],
          ) ,
        ),
      ],
    );
  }
}