小编Rob*_*isa的帖子

String _reason;
  Future<void> _performLogin() async {
    String reason;
    // This is just a demo, so no actual login here.
    try{
      FirebaseUser user =  await FirebaseAuth.instance.signInWithEmailAndPassword(email: _email, password: _password);
      if(user != null){
        Navigator.of(context).push(new MaterialPageRoute<dynamic>(
          builder: (BuildContext context) {
            return new MyApp();
          },
        ));
        final snack = new SnackBar(
          content: new Text("Signed In Successfully"),
          action: null,
          duration: new Duration(seconds: 4),
          backgroundColor: Colors.black,
        );

        Scaffold.of(context).showSnackBar(snack);
      }
    }on PlatformException catch(e){

      reason = '${e.message}';

      /*final snack = new SnackBar(
        content: new Text(e.message), …