背景
目前flutter发展火热，生态越来越繁荣，但相比于原生开发，仍非常稚嫩，使用起来坑很多，最近做需求——app内完成安装包的更新，完成该功能踩了很多的坑，现在记录一下实现过程。
实现过程
- 获取当前app的版本、平台信息
static String _version;
static String _flatform;
import 'package:package_info/package_info.dart';
/// 获取当前版本
PackageInfo packageInfo = await PackageInfo.fromPlatform();
_version = packageInfo.version;
import 'package:device_info/device_info.dart';
/// 获取平台信息
Future<String> getFlatForm() async {
if (Platform.isAndroid) {
_flatform = 'android';
} else {
_flatform = 'ios';
}
return _flatform;
}
- 从服务器拉取app版本的最新信息
Map _data = await _fetchVersionInfo();
/// 拉取版本号信息
Future<Map> _fetchVersionInfo() async {
HttpResult res = await Api.get('/version-api/versions/latest', query: {
'from': _flatform,
'version': _version,
});
return res.code == 200 ? res.data : null;
}
- 与本地version信息比对，选择是否展示更新弹窗，我们采用的是event_bus触发
if (localVersion == remoteVersion) return;
eventManager.eventBus.fire(new UpdateAppEvent(versionInfo));
- 进行版本升级，要注意区分Android与IOS
（1） IOS更新app包
IOS的处理方式比较简单，直接跳转到appStore即可，我这里采用的urlLauncher直接跳转
urlLauncher.launch(_link);
（2） Android更新app包
需要开启存储权限，如果没有权限就申请
import 'package:permission_handler/permission_handler.dart';
/// 检查是否有权限，用于安卓
Future<bool> checkPermission() async {
if (_flatform == 'android') {
PermissionStatus permission = await PermissionHandler()
.checkPermissionStatus(PermissionGroup.storage);
if (permission != PermissionStatus.granted) {
Map<PermissionGroup, PermissionStatus> permissions =
await PermissionHandler()
.requestPermissions([PermissionGroup.storage]);
if (permissions[PermissionGroup.storage] == PermissionStatus.granted) {
return true;
}
} else {
return true;
}
} else {
return true;
}
return false;
}
需要在Android的 AndroidManifest.xml文件增加权限配置
<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" />
下载apk
根据返回的下载链接，需要先把Android包文件下载到本地，这里需要对文件流进行操作，下载工具我是采用的HTTP请求工具库dio，这里也可以采用专业的下载插件flutter_downloader，这个插件支持Android、IOS下载，但是配置起来复杂，我折腾了好长时间，也没能配置成功，有玩转这个插件的可以给我推荐些文章。
import 'package:dio/dio.dart';
import 'package:path_provider/path_provider.dart';
/// 下载安卓更新包
Future<File> downloadAndroid(String url) async {
/// 创建存储文件
Directory storageDir = await getExternalStorageDirectory();
String storagePath = storageDir.path;
File file = new File('$storagePath/${Config.APP_NAME}v${_version}.apk');
if (!file.existsSync()) {
file.createSync();
}
try {
/// 发起下载请求
Response response = await Dio().get(url,
onReceiveProgress: showDownloadProgress,
options: Options(
responseType: ResponseType.bytes,
followRedirects: false,
));
file.writeAsBytesSync(response.data);
return file;
} catch (e) {
print(e);
}
}
安装apk
import 'package:install_plugin/install_plugin.dart';
/// 安装apk
Future<Null> installApk(String url) async {
File _apkFile = await downloadAndroid(url);
String _apkFilePath = _apkFile.path;
if (_apkFilePath.isEmpty) {
print('make sure the apk file is set');
return;
}
InstallPlugin.installApk(_apkFilePath, Config.APP_ID)
.then((result) {
print('install apk $result');
}).catchError((error) {
print('install apk error: $error');
});
}
这里我用的是install_plugin: ^2.0.1，该插件在安卓上能正常运行，但是在Apple上
先是报
[!] Unable to determine Swift version for the following pods:
install_plugin does not specify a Swift version and none of the targets (Runner) integrating it have the SWIFT_VERSION attribute set. Please contact the author or set the SWIFT_VERSION attribute in at least one of the targets that integrate this pod.
Xcode:
The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.
手动添加了SWIFT_VERSION后，又报
fatal error: 'install_plugin/install_plugin-Swift.h' file not found
#import <install_plugin/install_plugin-Swift.h>
报错原因是iOS在构建的时候默认是objective-c，而这个插件使用的是swift
解决方法：
创建ios/File.swift
//
// File.swift
// Runner
//
// Created by richer on 2019/11/22.
// Copyright © 2019 The Chromium Authors. All rights reserved.
//
import Foundation
创建ios/Runner-Bridging-Header.h文件
//
// Use this file to import your target's public headers that you would like to expose to Swift.
//
编辑ios/Podfile，在target 'Runner' do后面添加 use_frameworks!
target 'Runner' do
use_frameworks!
- 展示下载进度，dio提供下载进度的回调
/// 展示下载进度
void showDownloadProgress(num received, num total) {
if (total != -1) {
double _progress =
double.parse('${(received / total).toStringAsFixed(2)}');
eventManager.eventBus
.fire(new UpdateAndroidProgressEvent(_progress));
}
}
