sms not readin flutter code example

Example: how read all messages in mobile flutter

class MyInbox extends StatefulWidget{
  @override
  State createState() {
    // TODO: implement createState
    return MyInboxState();
  }

}

class MyInboxState extends State{
  SmsQuery query = new SmsQuery();
  List messages=new List();
  @override
 initState()  {
    // TODO: implement initState
    super.initState();

  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text("SMS Inbox"),
        backgroundColor: Colors.pink,
      ),
      body: FutureBuilder(
        future: fetchSMS() ,
        builder: (context, snapshot)  {

        return ListView.separated(
            separatorBuilder: (context, index) => Divider(
              color: Colors.black,
            ),
            itemCount: messages.length,
            itemBuilder: (context,index){
          return Padding(
            padding: const EdgeInsets.all(8.0),
            child: ListTile(
              leading: Icon(Icons.markunread,color: Colors.pink,),
              title: Text(messages[index].address),
              subtitle: Text(messages[index].body,maxLines:2,style: TextStyle(),),
            ),
          );
        });
      },)
    );
  }

  fetchSMS()
  async {
    messages = await query.getAllSms;
  }
}