flutter 按键监听

 

import 'package:flutter/material.dart'; import 'package:flutter/services.dart'; void main() => runApp(MyApp()); class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State<MyApp> { FocusNode _focusNode = FocusNode(); String s=""; void initState() { //super.initState();
    print("初始化_DemoState"); //HongWai(); //_initNotification();
 } @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: Text("测试"), ), body: Center(child: HongWai() //Text('data'),
 )), ); } Widget HongWai() => RawKeyboardListener( focusNode: FocusNode(), onKey: (RawKeyEvent event) { print("start"); RawKeyDownEvent rawKeyDownEvent = event; RawKeyEventDataAndroid rawKeyEventDataAndroid = rawKeyDownEvent.data; if (rawKeyEventDataAndroid.keyCode == 288) { //  } print("keyCode: ${rawKeyEventDataAndroid.keyCode}"); }, child: Container(child:TextField()), ); }