[Flutter]检测新版本功能实现

检测新版本

配置权限

配置AndroidMenifest.xml文件

流程图

开始检测

//开始检测按钮
ElevatedButton(
onPressed: () {
//__getPackageInfo()返回值是Future，用then拆开获得当前版本号
_getPackageInfo().then((value) {
//当前版本号赋值给version，最新版本号暂设置在全局newVersion
version = value;
//引用CheckVersion类比较当前版本号和最新版本号大小
CheckVersion.isNewVersion(version, newVersion)
? _needUpdate()//需要更新
: _needNotUpdate();//不需要更新
});
},
child: Text('检测新版本'),
),


//返回当前版本号
_getPackageInfo() async {
PackageInfo packageInfo = await PackageInfo.fromPlatform();
String version = packageInfo.version;
return version;
}


是否需要更新

//需要更新Dialog
void _needUpdate() async {
await showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: Text("版本检测!"),
content: Text("发现新的版本，是否更新!"),
actions: [
TextButton(
child: Text("否"),
onPressed: () {
Navigator.pop(context);
},
),
TextButton(
child: Text("是"),
onPressed: () {
_downLoad();//引用下载方法
Navigator.pop(context);//取消dialog
})
],
);
});
}


//不需要更新Dialog
_needNotUpdate() async {
await showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: Text('版本检测'),
content: Text('无需更新，已是最新版本！'),
actions: [
TextButton(
child: Text("好"),
onPressed: () {
Navigator.pop(context, 'Cancle');//取消dialog
},
),
],
);
});
}


开始执行下载方法

//下载打开文件
_downLoad() async {
var permission = await this._checkPermission();//检测是否有权限
//如果有权限，配置安装路径
if (permission) {
Directory? directory = await getExternalStorageDirectory();
String? _localPath;
//注意Flutter2.2以后的版本加入了Null safety
if (directory != null) {
_localPath = directory.path;
String _appName = "app-release.apk";
String _savePath = "$_localPath/$_appName";
String apkUrl = "https://www.tobutomi.top/app/app-release.apk";
//实例化Dio网络请求库
Dio dio = new Dio();
//实例化下载进度Dialog库
ProgressDialog pd = ProgressDialog(context: context);
pd.show(max: 100, msg: '正在下载...');
//使用dio.download进行下载
await dio.download(apkUrl, _savePath,
onReceiveProgress: (received, total) {
//下载进度
int progress = (((received / total) * 100).toInt());
pd.update(value: progress);
});
await OpenFile.open(_savePath,
type: "application/vnd.android.package-archive");
} else {
print("获取目录失败");
}
} else {
print("没有权限");
}
}


//检查权限_checkPermission
Future _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;
}


完整代码

CheckVersion工具类

class CheckVersion {
static bool isNew = false;
static isNewVersion(version, newversion) {
List verList = version.split('.');
List newVerList = newversion.split('.');
if (int.parse(newVerList[0]) > int.parse(verList[0])) {
isNew = true;
} else if (int.parse(newVerList[0]) == int.parse(verList[0])) {
if (int.parse(newVerList[1]) > int.parse(verList[1])) {
isNew = true;
} else if (int.parse(newVerList[1]) == int.parse(verList[1])) {
if (int.parse(newVerList[2]) > int.parse(verList[2])) {
isNew = true;
}
}
}
return isNew;
}
}


主页代码

import 'package:flutter/material.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:io';
import 'package:open_file/open_file.dart';
import 'package:dio/dio.dart';
import 'package:permission_handler/permission_handler.dart';
import '../../components/CheckVersion.dart';
import 'package:sn_progress_dialog/sn_progress_dialog.dart';
class AppVersionPage extends StatefulWidget {
AppVersionPage({Key? key}) : super(key: key);
_AppVersionPageState createState() => _AppVersionPageState();
}
class _AppVersionPageState extends State {
//设置新版本号，可以存于云端
var newVersion = '1.0.0';
var version;
//需要更新
void _needUpdate() async {
await showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: Text("版本检测!"),
content: Text("发现新的版本，是否更新!"),
actions: [
TextButton(
child: Text("否"),
onPressed: () {
Navigator.pop(context);
},
),
TextButton(
child: Text("是"),
onPressed: () {
_downLoad();
Navigator.pop(context);
})
],
);
});
}
//不需要更新
_needNotUpdate() async {
await showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: Text('版本检测'),
content: Text('无需更新，已是最新版本！'),
actions: [
TextButton(
child: Text("好"),
onPressed: () {
Navigator.pop(context, 'Cancle');
},
),
],
);
});
}
//获取版本号
_getPackageInfo() async {
PackageInfo packageInfo = await PackageInfo.fromPlatform();
String version = packageInfo.version;
return version;
}
//检查权限
Future _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;
}
//下载打开文件
_downLoad() async {
var permission = await this._checkPermission();
if (permission) {
Directory? directory = await getExternalStorageDirectory();
String? _localPath;
//注意Flutter2.2以后的版本加入了Null safety
if (directory != null) {
_localPath = directory.path;
String _appName = "aaa.apk";
String _savePath = "$_localPath/$_appName";
String apkUrl = "https://www.tobutomi.top/app/app-release.apk";
Dio dio = new Dio();
ProgressDialog pd = ProgressDialog(context: context);
pd.show(max: 100, msg: '正在下载...');
await dio.download(apkUrl, _savePath,
onReceiveProgress: (received, total) {
int progress = (((received / total) * 100).toInt());
pd.update(value: progress);
});
await OpenFile.open(_savePath,
type: "application/vnd.android.package-archive");
} else {
print("获取目录失败");
}
} else {
print("没有权限");
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("app升级演示"),
),
body: Center(
child: ElevatedButton(
onPressed: () {
_getPackageInfo().then((value) {
version = value;
CheckVersion.isNewVersion(version, newVersion)
? _needUpdate()
: _needNotUpdate();
});
},
child: Text('检测新版本'),
),
),
);
}
}