How to dismiss an AlertDialog on a FlatButton click?

Navigator.of(context, rootNavigator: true).pop('dialog')

worked with me.

Navigator.pop(_)

worked for me, but the Flutter Team's gallery contains an example using:

Navigator.of(context, rootNavigator: true).pop()

which also works, and I am tempted to follow their lead.

If you don't want to return any result, use either of them:

Navigator.of(context).pop();
Navigator.pop(context);

But if you do want to return some result, see this

Example:

showDialog(
    context: context,
    builder: (_) {
      return AlertDialog(
        title: Text('Wanna Exit?'),
        actions: [
          FlatButton(
            onPressed: () => Navigator.pop(context, false), // passing false
            child: Text('No'),
          ),
          FlatButton(
            onPressed: () => Navigator.pop(context, true), // passing true
            child: Text('Yes'),
          ),
        ],
      );
    }).then((exit) {
  if (exit == null) return;

  if (exit) {
    // user pressed Yes button
  } else {
    // user pressed No button
  }
});

Generally Navigator.pop(context); works.

But If the application has multiple Navigator objects and dialogBox doesn't close, then try this

Navigator.of(context, rootNavigator: true).pop();

If you want to pass the result call, try

Navigator.pop(context,result);

OR

Navigator.of(context, rootNavigator: true).pop(result);

Navigator.of(dialogContext).pop() otherwise you can close page if you navigated from Master to Detail page

                showDialog(
                  context: context,
                  builder: (dialogContext) {
                    return Dialog(
                      child: Column(
                        children: [
                          Text("Content"),
                          RaisedButton(
                            onPressed: () => Navigator.of(dialogContext).pop(),
                            child: Text("Close"),
                          )
                        ],
                      ),
                    );
                  },
                );

Example of dismissing alert dialog on flat button click

RaisedButton(
        onPressed: () {
          showDialog(
              context: context,
              builder: (context) => AlertDialog(
                    title: Text('Are you sure?'),
                    content: Text('Do you want to remove item?'),
                    actions: <Widget>[
                      FlatButton(
                          onPressed: () => Navigator.of(context).pop(false),//  We can return any object from here
                           child: Text('NO')),
                      FlatButton(
                          onPressed: () => Navigator.of(context).pop(true), //  We can return any object from here
                          child: Text('YES'))
                    ],
                  )).then((value) =>
              print('Selected Alert Option: ' + value.toString()));
        },
        child: Text('Show Alert Dialog'),
      ),

Above code have two unique things which is used to provide callback result of dialog

Navigator.of(context).pop(false) -- return false value when we pressed NO Navigator.of(context).pop(true) -- return true value when we pressed YES

Based on these return value, we can perform some operation outside of it or maintain the dialog status value

This works Prefectly

      RaisedButton(
                child: Text(
                  "Cancel",
                  style: TextStyle(color: Colors.white),
                ),
                color: Colors.blue,
                onPressed: () => Navigator.pop(context),
              ),

This worked for me Navigator.of(context, rootNavigator: true).pop('dialog').

Navigator.pop() just closes the current page/screen.

Use Navigator.pop(context);

Example

showDialog(
            context: context,
            child: new AlertDialog(
              title: const Text("Location disabled"),
              content: const Text(
                  """
Location is disabled on this device. Please enable it and try again.
                  """),
              actions: [
                new FlatButton(
                  child: const Text("Ok"),
                  onPressed: () {
                      Navigator.pop(context);
                    },
                ),
              ],
            ),
        );

Creating a separate context for Alert Dialog would help.

showDialog(
  context: context,
  builder: (alertContext) => AlertDialog(
    title: const Text("Location disabled"),
    content: const Text(
        """Location is disabled on this device. Please enable it and try again."""),
    actions: [
      new FlatButton(
        child: const Text("Ok"),
        onPressed: () => Navigator.pop(alertContext),
      ),
    ],
  ),
);

Please use following for code to close dialog

RaisedButton(
     onPressed: () { Navigator.of(context).pop();},
     child: Text("Close",style: TextStyle(color: Colors.white), ),
                color: Colors.black,
           )

This answer works if you want to pop the dialog and navigate to another view. This part 'current_user_location' is the string the router need to know which view to navigate to.

FlatButton(
           child: Text('NO'),
           onPressed: () {
             Navigator.popAndPushNamed(context, 'current_user_location');
              },
           ),

This enough to dismisss dialog add inside Any callback like
onpressed,ontap

Navigator.of(context).pop();

    AlertDialog(
          title: Center(child: Text("$title")),
          insetPadding: EdgeInsets.zero,
          titlePadding: EdgeInsets.only(top: 14.0, bottom: 4),
          content: Container(
            height: 50,
            child: TextFormField(
              controller: find_controller,
              decoration: InputDecoration(
                suffixIcon: context.watch<MediaProvider>().isChangeDialog
                    ? IconButton(
                        onPressed: () {
                          clearController(find_controller);
                        },
                        icon: Icon(Icons.clear))
                    : null,
                border: OutlineInputBorder(
                    borderSide: BorderSide(color: Colors.deepPurpleAccent)),
                hintText: 'Id',
              ),
              onChanged: (val) {
                if (val.isNotEmpty)
                  context.read<MediaProvider>().isChangeDialog = true;
                else
                  context.read<MediaProvider>().isChangeDialog = false;
              },
            ),
          ),
          actions: [
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Padding(
                  padding: const EdgeInsets.all(4.0),
                  child: OutlinedButton(
                      child: Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          Align(
                            child: Padding(
                              padding: const EdgeInsets.symmetric(horizontal: 12.0),
                              child: Icon(Icons.clear),
                            ),
                          ),
                          Text("Cancel")
                        ],
                      ),
                      onPressed: () {
                        context.read<MediaProvider>().isChangeDialog = false;
//========================this enough to dismisss dialog
                        Navigator.of(context).pop();
                      }),
                ),
                Padding(
                  padding: const EdgeInsets.all(4.0),
                  child: ElevatedButton(
                      onPressed: context.watch<MediaProvider>().isChangeDialog
                          ? () {
                              context.read<MediaProvider>().isChangeDialog = false;
                              okCallback;
                            }
                          : null,
                      child: Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          Align(
                            child: Padding(
                              padding: const EdgeInsets.symmetric(horizontal: 12.0),
                              child: Icon(Icons.check),
                            ),
                          ),
                          Text("OK")
                        ],
                      )),
                )
              ],
            ),
          ],
        );

use get package. then Get.back() to close Modal

pass it in the showDialog barrierDismissible : true

The accepted answer states how to dismiss a dialog using the Navigator Class. To dismiss a dialog without using Navigator you can set the onPressed event of the button to the following:

setState((){
  thisAlertDialog = null; 
});

In case the code above is not self-explanatory it is basically setting the Parent AlertDialog of the FlatButton to null, thus dismissing it.