（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 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
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 downloadAndroid(String url) async {
/// 创建存储文件
Directory storageDir = await getExternalStorageDirectory();
String storagePath = storageDir.path;
File file = new File(’s t o r a g e P a t h / storagePath/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 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: $error’);
});
}
这里我用的是install_plugin: ^2.0.1，该插件在安卓上能正常运行，但是在Apple上先是报
[!] Unable to determine Swift version for the following pods:
install_plugin does not specify a Swift version and none of the targets (Runner) integrating it have the SWIFT_VERSION attribute set. Please contact the author or set the SWIFT_VERSION attribute in at least one of the targets that integrate this pod.
Xcode:
The sandbox is not in sync with the Podfile.lock. Run ‘pod install’ or update your CocoaPods installation.
手动添加了SWIFT_VERSION后，又报
fatal error: ‘install_plugin/install_plugin-Swift.h’ file not found
#import <install_plugin/install_plugin-Swift.h>
报错原因是iOS在构建的时候默认是objective-c，而这个插件使用的是swift
解决方法：
创建ios/File.swift
//
// File.swift
// Runner
//
// Created by richer on 2019/11/22.
// Copyright © 2019 The Chromium Authors. All rights reserved.
//
import Foundation
创建ios/Runner-Bridging-Header.h文件
//
// Use this file to import your target’s public headers that you would like to expose to Swift.
//
编辑ios/Podfile，在target ‘Runner’ do后面添加 use_frameworks!
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target ‘Runner’ do
use_frameworks!
- 展示下载进度，dio提供下载进度的回调
/// 展示下载进度
void showDownloadProgress(num received, num total) {
if (total != -1) {
double _progress =
double.parse(’${(received / total).toStringAsFixed(2)}’);
eventManager.eventBus
.fire(new UpdateAndroidProgressEvent(_progress));
}
}