How to add onLongPress listener in Flutter PopupMenuButton

In this Google flutter code example we are going to learn how to add onLongPress listener in Flutter PopupMenuButton.

You can copy and adopt this source code example to your android project without reinventing the wheel.

The code is based on flutter version 1.

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'onlongpress_popupmenu_task-12.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: OnLongPressPopupMenu(),
    );
  }
}

onlongpress_popupmenu_task-12.dart

import 'package:flutter/material.dart';

class OnLongPressPopupMenu extends StatefulWidget {
  @override
  OnLongPressPopupMenuState createState() {
    return new OnLongPressPopupMenuState();
  }
}

class OnLongPressPopupMenuState extends State<OnLongPressPopupMenu> {
  _showMenu() async {
    await showMenu(
      position: RelativeRect.fromLTRB(100, 400, 100, 400),
      context: context,
      items: [
        PopupMenuItem(
          child: Text("InduceSmile.com"),
        ),
        PopupMenuItem(
          child: Text("Flutter.io"),
        ),
        PopupMenuItem(
          child: Text("Google.com"),
        ),
      ],
      elevation: 8.0,
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("OnLongPress PopupMenuButton Listener Example"),
        ),
        body: Center(
          child: GestureDetector(
            onLongPress: _showMenu,
            child: Padding(
              padding: EdgeInsets.all(12.0),
              child: Text("Long Press Here"),
            ),
          ),
        ));
  }
}

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