Flutter: ShowDialog not working with the OnTap() method of a ListTile

Question

I am using a drawer to create a menu that houses ListTiles for the options. I want to create a popup when the tiles are tapped by the user. Currently, the code displays nothing when the tiles are tapped even though after the showDialog there is a Navigator.pop().

// Drawer that includes the ListTiles in question
 Drawer(
          child: ListView(
            padding: EdgeInsets.zero,
            children: <Widget>[
              DrawerHeader(
                child: Text('Smash Tracker'),
                ),
              ),
              ListTile(
                title: Text(
                    'About',
                  style: TextStyle(
                    fontFamily: 'Smash',
                    fontSize: 15.0,
                    color: Color.fromRGBO(77, 114, 152, 1.0),
                  ),
                ),
                onTap: () {
                  // Show PopUp
                  showDialog(context: context, child:
                    new AlertDialog(
                      title: new Text(
                        'About',
                        style: TextStyle(fontFamily: "Smash"),
                      ),
                      content: new Text(
                        'This is a placeholder. This is a placeholder. This is a placeholder. This is a placeholder.',
                        style: TextStyle(fontFamily: "Smash"),
                      ),
                    )
                  );

                  // Doesn't run
                  Navigator.pop(context);
                },
              ),

Here is a demo:

via GIPHY

The other ListTiles have the only have Navigator.pop() inside of their onTap() method.

It was used in answer to a question I thought was similar to my issue. — Ayren King, Aug 02 '20 at 05:21
First do `Navigator.pop()` to close the drawer and then call `showDialog` — Navaneeth P, Aug 02 '20 at 05:24
I moved the ```Navigator.pop()``` above the ```showDialog``` and it only closes the drawer with no pop up. — Ayren King, Aug 02 '20 at 05:30

score 3 · Accepted Answer · answered Aug 02 '20 at 05:31

The dialog isn't showing because you are popping it immediately with the Navigator.pop(context). You can await the Dialog since it returns a Future<T> before popping.

I added a demo using your widget tree as an example:

Drawer(
        child: ListView(
          padding: EdgeInsets.zero,
          children: <Widget>[
            DrawerHeader(
              child: Text('Smash Tracker'),
            ),
            ListTile(
              title: Text(
                'About',
                style: TextStyle(
                  fontFamily: 'Smash',
                  fontSize: 15.0,
                  color: Color.fromRGBO(77, 114, 152, 1.0),
                ),
              ),
              onTap: () async { // mark the function as async
                print('tap');
                // Show PopUp

                // await the dialog
                 await showDialog(
                    context: context,
                    child: new AlertDialog(
                      title: new Text(
                        'About',
                        style: TextStyle(fontFamily: "Smash"),
                      ),
                      content: new Text(
                        'This is a placeholder. This is a placeholder. This is a placeholder. This is a placeholder.',
                        style: TextStyle(fontFamily: "Smash"),
                      ),
                    ));

                // Doesn't run
                Navigator.pop(context);
              },
            ),
          ],
        ),
      ),

OUTPUT:

Flutter: ShowDialog not working with the OnTap() method of a ListTile

1 Answers1

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