Flutter实战之坑——按返回键回到手机桌面不退出app

曾经终败给现在 2022-01-19 01:23 960阅读 0赞

> 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);
    					} 
    				}
    			}
    		);
    	}
    }
    复制代码

### 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);
    	}
    }
    复制代码

### 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"),
              ),
            );
          },
        );
      }
    }
    复制代码

### End ###

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