flutter app内更新升级

爱被打了一巴掌 2023-06-29 05:53 23阅读 0赞

用flutter开发了一个简单的跨平台app，在网上找了很多 app内升级的博客，大部分都是复制的，讲的不全，不过有一篇好文章推荐给大家，重点是引用插件的版本尽量和博客中的一致，否则编译时各种报错，[Flutter 项目 app迭代更新][Flutter _ app]，我开始引用各个插件最新版本，结果一直编译失败

下面将分详细说说，为那些初学者提供思路，并把[demo分享出来][demo]

###### 1.有两种方法实现app升级 ######

*  1.直接使用url\_launcher插件跳转本地浏览器下载，版本号没有要求
 *  2.使用多个flutter插件，一起达到下载升级效果

###### 2.大概思路 ######

*  1.进入页面，请求服务端接口，对比服务端的版本与当前手机版本是否一致
 *  2.不一致则提示用户可以升级
 *  3.如果是android：则下载apk文件，存入手机某个位置，完成后打开该apk进行安装
 *  4.如果是ios：则通过url\_launcher插件，打开 app\_store中你们应用的链接地址，用户自己选择是否升级

下面看看手机上的效果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aHV5dS5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70] ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aHV5dS5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 1]

*  使用 url\_launcher插件方式，会提示使用本地浏览器下载  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aHV5dS5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 2] ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aHV5dS5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 3]  
    最后都能进入安装界面  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aHV5dS5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 4]

###### 3.代码实现 ######

*  1.引用插件，千万要注意版本，我最开始使用的最新版，结果一直编译失败

dependencies:
      flutter:
        sdk: flutter
      dio: ^3.0.8
      package_info: ^0.4.0+13
      permission_handler: 3.2.0
      flutter_downloader: 1.1.7
      path_provider: 1.5.1
      open_file: ^1.3.0
      url_launcher: 5.1.2
      progress_dialog: 1.2.0

*  2.在android/app/src/main/AndroidManifest.xml中添加配置

<uses-permission android:name="android.permission.INTERNET"/>
       <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
       <uses-permission android:name="android.permission.RECORD_AUDIO" />
       <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
       <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    
       <application .....>
          .....其他已有内容省略了
    	   <provider
    		    android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider"
    		    android:authorities="${applicationId}.flutter_downloader.provider"
    		    android:exported="false"
    		    android:grantUriPermissions="true">
    		    <meta-data
    		        android:name="android.support.FILE_PROVIDER_PATHS"
    		        android:resource="@xml/provider_paths"/>
    		</provider>
    		
    		<provider
    		    android:name="androidx.work.impl.WorkManagerInitializer"
    		    android:authorities="${applicationId}.workmanager-init"
    		    android:enabled="false"
    		    android:exported="false" />
    		
    		<provider
    		    android:name="vn.hunghd.flutterdownloader.FlutterDownloaderInitializer"
    		    android:authorities="${applicationId}.flutter-downloader-init"
    		    android:exported="false">
    		    <meta-data
    		        android:name="vn.hunghd.flutterdownloader.MAX_CONCURRENT_TASKS"
    		        android:value="5" />
    		</provider>
       </application>

*  3.服务端返回的数据集如下：

{ 
        "android_version" : "1.0.2",
        "android_msg" : "对系统进行了优化，修复了多个bug",
        "android_url" : "http://www.xxx.com/flutterApp.apk"
    }

*  4.代码实现，代码比较长，都很简单且有注释，请细心阅读一下

import 'dart:convert';
    import 'dart:io';
    import 'package:flutter/cupertino.dart';
    import 'package:flutter/material.dart';
    import 'package:flutter_downloader/flutter_downloader.dart';
    import 'package:open_file/open_file.dart';
    import 'package:package_info/package_info.dart';
    import 'package:path_provider/path_provider.dart';
    import 'package:url_launcher/url_launcher.dart';
    import 'package:permission_handler/permission_handler.dart';
    import 'Http.dart';
    import 'package:progress_dialog/progress_dialog.dart';
    
    //定义apk的名称，与下载进度dialog
    String apkName ='flutterApp.apk';
    ProgressDialog pr;
    
    class Upgrade extends StatefulWidget { 
      Upgrade({ Key key}) : super(key: key);
    
      @override
      _UpgradeState createState() => _UpgradeState();
    }
    
    class _UpgradeState extends State<Upgrade> { 
    
      @override
      void initState() { 
        super.initState();
        //检查是否有更新
        checkUpdate(context);
      }
    
      @override
      Widget build(BuildContext context) { 
        return Scaffold(
          appBar: AppBar(
            title: Text('app upgrade'),
          ),
          body: Container(
            alignment: Alignment.center,
            child: Text('Checking...' , style: TextStyle(
              fontSize: 16,
            ),),
          ),
        );
      }
    
      ///检查是否有更新
    Future<void> checkUpdate(BuildContext context) async{ 
      //Android , 需要下载apk包
      if(Platform.isAndroid){ 
        print('is android');
          PackageInfo packageInfo = await PackageInfo.fromPlatform();
          String localVersion = packageInfo.version;
          //此处使用了dio，封装了httpGet方法，获取服务端中最新的app版本信息
          String versionInfo = await httpGet('/appversion.json');
          if(versionInfo != ""){ 
            Map<String, dynamic> map = json.decode(versionInfo);
            String serverAndroidVersion = map['android_version'].toString();
            String serverMsg = map['android_msg'].toString();
            String url = map['android_url'].toString();
            print(url);
            print('本地版本: ' + localVersion + ',最新版本: ' + serverAndroidVersion );
            int c = serverAndroidVersion.compareTo(localVersion);
            //如果服务端版本大于本地版本则提示更新
            if(c == 1){ 
              showUpdate(context, serverAndroidVersion, serverMsg, url);
            }
          }
      }
      
      //Ios , 只能跳转到 AppStore , 直接采用url_launcher就可以了
      //android也可以采用此方法，会跳转到手机浏览器中下载
      if(Platform.isIOS){ 
        print('is ios');
        final url = "https://itunes.apple.com/cn/app/id1380512641"; // id 后面的数字换成自己的应用 id 就行了
        if (await canLaunch(url)) { 
          await launch(url, forceSafariVC: false);
        } else { 
          throw 'Could not launch $url';
        }
      }
    }
    
      ///2.显示更新内容
      Future<void> showUpdate(BuildContext context , String version, String data, String url) async { 
        return showDialog<void>(
          context: context,
          barrierDismissible: true,
          builder: (BuildContext context) { 
            return CupertinoAlertDialog(
              title: Text('检测到新版本 v$version'),
              content : Text('是否要更新到最新版本?') ,
              actions: <Widget>[
                FlatButton(
                  child: Text('下次在说'),
                  onPressed: () { 
                    Navigator.of(context).pop();
                  },
                ),
                FlatButton(
                  child: Text('立即更新'),
                  onPressed: ()=>doUpdate(context,version,url)
                  ,
                ),
              ],
            );
          },
        );
      }
    
      ///3.执行更新操作
      doUpdate(BuildContext context , String version,String url) async { 
        //关闭更新内容提示框
        Navigator.pop(context);
        //获取权限
        var per = await checkPermission();
        if(per != null && !per){ 
          return null;
        }
        //开始下载apk
        executeDownload(context , url);
      }
    
      ///4.检查是否有权限
      Future<bool> checkPermission() async { 
        //检查是否已有读写内存权限
        PermissionStatus status = await PermissionHandler().checkPermissionStatus(PermissionGroup.storage);
        print(status);
        
        //判断如果还没拥有读写权限就申请获取权限
        if(status != PermissionStatus.granted){ 
          var map = await PermissionHandler().requestPermissions([PermissionGroup.storage]);
          if(map[PermissionGroup.storage] != PermissionStatus.granted){ 
            return false;
          }
        }
        return true;
      }
    
      ///5.下载apk
      Future<void> executeDownload(BuildContext context ,String url) async { 
        //下载时显示下载进度dialog
        pr = new ProgressDialog(context,type: ProgressDialogType.Download, isDismissible: true, showLogs: true);
        if (!pr.isShowing()) { 
          pr.show();
        }
        //apk存放路径
        final path = await _apkLocalPath;
        File file = File(path + '/' + apkName);
        if (await file.exists()) await file.delete();
        
        //下载
        final taskId = await FlutterDownloader.enqueue(
            url: url,//下载最新apk的网络地址
            savedDir: path,
            fileName: apkName,
            showNotification: true,
            openFileFromNotification: true);
            
        FlutterDownloader.registerCallback((id, status, progress) { 
          if (status == DownloadTaskStatus.running) { 
            pr.update(progress: progress.toDouble(), message: "下载中，请稍后…");
          }
          if (status == DownloadTaskStatus.failed) { 
            if (pr.isShowing()) { 
              pr.hide();
            }
          }
          if (taskId == id && status == DownloadTaskStatus.complete) { 
            if (pr.isShowing()) { 
              pr.hide();
            }
            _installApk();
          }
        });
      }
    
      //6.安装app
      Future<Null> _installApk() async { 
        String path = await _apkLocalPath;
        await OpenFile.open(path + '/' + apkName);
      }
      // 获取apk存放地址(外部路径)
      Future<String> get _apkLocalPath async { 
        final directory = await getExternalStorageDirectory();
        return directory.path;
      }
    }

谢谢

[Flutter _ app]: https://blog.csdn.net/DeckeDeng/article/details/90067482
[demo]: https://download.csdn.net/download/zhuyu19911016520/12095883
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