Flutter学习笔记按返回键直接回到桌面，不退出APP

在Flutter应用中，每次按返回键返回桌面时，APP就自动退出了。为了使返回到桌面时，应用可以在后台继续执行，需要与Android原生进行通讯

首先在android包下的MainActivity中，修改

package com.example.flutter_app;import android.os.Bundle;import io.flutter.app.FlutterActivity;import io.flutter.plugin.common.MethodCall;import io.flutter.plugin.common.MethodChannel;import io.flutter.plugins.GeneratedPluginRegistrant;public class MainActivity extends FlutterActivity {         //通讯名称，回到手机桌面    private final String CHANNEL = "android/back/desktop";    //返回手机桌面事件    static final String eventBackDesktop = "backDesktop";    @Override    protected void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);        GeneratedPluginRegistrant.registerWith(this);        initBackToDesktop();    }    //注册返回到手机桌面事件    private void initBackToDesktop() {             new MethodChannel(getFlutterView(), CHANNEL).setMethodCallHandler(                new MethodChannel.MethodCallHandler() {                         @Override                    public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {                             if (methodCall.method.equals(eventBackDesktop)) {                                 moveTaskToBack(false);                            result.success(true);                        }                    }                }        );    }}

接下来在Flutter的lib下添加一个android_back_desktop.dart文件：

import 'package:flutter/services.dart';class AndroidBackDesktop{       //通讯名称，回到手机桌面  static const String CHANNEL = "android/back/desktop";  //设置回退到手机桌面事件  static const String eventBackDesktop = "backDesktop";  //设置回退到手机桌面方法  static Future<bool> backToDesktop() async {         final platform = MethodChannel(CHANNEL);    //通知安卓返回到手机桌面    try{           await platform.invokeMethod(eventBackDesktop);    }    on PlatformException catch (e){           print("通信失败，设置回退到安卓手机桌面失败");      print(e.toString());    }    return Future.value(false);  }}

最后在main.dart中使用WillPopScope包裹，在onWillpop中调用通知回到桌面方法：

import 'package:flutter/material.dart';import 'package:flutter_app/android_back_desktop.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget {       @override  Widget build(BuildContext context) {         return MaterialApp(      title: 'Flutter Demo',      theme: ThemeData(        primarySwatch: Colors.blue,      ),      home: MyHomePage(title: 'Flutter Demo Home Page'),    );  }}class MyHomePage extends StatefulWidget {       MyHomePage({     Key key, this.title}) : super(key: key);  final String title;  @override  _MyHomePageState createState() => _MyHomePageState();}class _MyHomePageState extends State<MyHomePage> {       int _counter = 0;  void _incrementCounter() {         setState(() {           _counter++;    });  }  @override  Widget build(BuildContext context) {         return WillPopScope(        child: Scaffold(          appBar: AppBar(            title: Text(widget.title),          ),          body: Center(            child: Column(              mainAxisAlignment: MainAxisAlignment.center,              children: <Widget>[                Text(                  'You have pushed the button this many times:',                ),                Text(                  '$_counter',                  style: Theme.of(context).textTheme.display1,                ),              ],            ),          ),          floatingActionButton: FloatingActionButton(            onPressed: _incrementCounter,            tooltip: 'Increment',            child: Icon(Icons.add),          ), // This trailing comma makes auto-formatting nicer for build methods.        ),        onWillPop: AndroidBackDesktop.backToDesktop);  }}

效果：

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