Flutter实战之坑——按返回键回到手机桌面不退出app

原理：在main里监听最外层返回键，然后通讯原生，执行 moveTaskToBack(false) 回到手机桌面不退出app

安卓文件里 MainActivity.java

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

新建一个 android_back_desktop.dart

import 'package:flutter/services.dart';import 'package:flutter/material.dart';class AndroidBackTop {    //初始化通信管道-设置退出到手机桌面    static const String CHANNEL = "android/back/desktop";    //设置回退到手机桌面    static Future<bool> backDeskTop() async {        final platform = MethodChannel(CHANNEL);        //通知安卓返回,到手机桌面        try {            final bool out = await platform.invokeMethod('backDesktop');            if (out) debugPrint('返回到桌面');        } on PlatformException catch (e) {            debugPrint("通信失败(设置回退到安卓手机桌面:设置失败)");            print(e.toString());        }        return Future.value(false);    }}

入口文件 main.dart

import 'package:flutter_smart_park/untils/android_back_desktop.dart';export 'package:common_utils/common_utils.dart';void main() async {  runApp(MyApp());}class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return Provide<ConfigModel>(      builder: (context, child, configModel) {        return MaterialApp(          title: 'test',          debugShowCheckedModeBanner: false,          home: WillPopScope(            onWillPop: () async {                AndroidBackTop.backDeskTop();  //设置为返回不退出app                return false;  //一定要return false            },            child: Text("Test"),          ),        );      },    );  }}

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