Flutter 检测应用版本号、服务器下载文件以及实现App 自动升级、安装

Android App 执行自动升级流程

1. 获取本地版本号
2. 请求服务器的api 接口获取服务器保存版本号
3. 本地版本和服务器版本不一致提示升级，弹窗提示用户是否更新
4. 用户确定升级，调用文件传输方法下载apk 文件
5. 监听下载进度
6. 下载完成打开Apk 进行安装

注意：在Ios 中没法直接下载安装，如果版本不一致直接跳转到Ios 应用对应的应用市场就可以了

升级app 之前的准备工作配置权限

配置AndroidMenifest.xml 文件

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />

Android 升级app 涉及的API 库

获取版本信息

https://pub.dev/packages/package_info

PackageInfo packageInfo = await PackageInfo.fromPlatform();
String appName = packageInfo.appName;
String packageName = packageInfo.packageName;
String version = packageInfo.version;
String buildNumber = packageInfo.buildNumber;
print("appName:${appName}");
print("packageName:${packageName}");
print("version:${version}");
print("buildNumber:${buildNumber}");

获取文件存储路径

https://pub.dev/packages/path_provider

Directory tempDir = await getTemporaryDirectory();
String tempPath = tempDir.path;
Directory appDocDir = await getApplicationDocumentsDirectory();
String appDocPath = appDocDir.path;
var directory = await getExternalStorageDirectory();
String storageDirectory=directory.path;
print("tempPath:${tempPath}");
print("appDocDir:${appDocPath}");
print("StorageDirectory:${storageDirectory}");

下载文件

https://pub.dev/packages/dio\

final directory = await getExternalStorageDirectory();
String _localPath = directory.path;
String _appName = "aaa.apk";
String _savePath="$_localPath/$_appName";
String apkUrl = "https://jd.itying.com/jdshop.apk";
///参数一文件的网络储存URL
///参数二下载的本地目录文件
///参数三下载监听
Dio dio = new Dio();
await dio.download(apkUrl,_savePath,
onReceiveProgress: (received, total) {
if (total != -1) {
///当前下载的百分比例
  print((received / total * 100).toStringAsFixed(0) + "%");
}
});
print(_savePath);
await OpenFile.open(_savePath,type: "application/vnd.android.package-archive");

打开文件

https://pub.dev/packages/open_file

OpenFile.open("${_localPath}/jdshop.apk");
await OpenFile.open(_savePath,type: "application/vnd.android.package-archive");

检测权限

https://pub.dev/packages/permission_handler

Future<bool> _checkPermission() async {
  if (Theme.of(context).platform == TargetPlatform.android) {
    final status = await Permission.storage.status;
    if (status != PermissionStatus.granted) {
      final result = await Permission.storage.request();
      if (result == PermissionStatus.granted) {
        return true;
      }
    } else {
      return true;
    }
  }
  return false;
}

注意事项

1. 服务器的App 版本必须大于本地App 版本
2. 本地App 和服务器App 的包名称签名必须一致，这样的话服务器的包才可以替换本地的包。