1、开发更新服务接口

namespace UpdateApkpublic interface IUpgradeService
{/// <summary>/// 检查更新/// </summary>/// <param name="url">/// 检查URL/// </param>/// <returns></returns>Task<Dictionary<string, string>> CheckUpdatesAsync(string url);/// <summary>/// 下载安装文件/// </summary>/// <param name="url">/// 下载URL/// </param>/// <param name="action">/// 进度条处理方法/// </param>/// <returns></returns>Task DownloadFileAsync(string url, Action<long, long> action);/// <summary>/// 安装APK的方法/// </summary>void InstallNewVersion();
}

using Android.Content;
using Android.OS;namespace UpdateApkpublic class UpgradeService : IUpgradeService
{readonly HttpClient _client;public UpgradeService(){_client = new HttpClient();}public async Task<Dictionary<string, string>> CheckUpdatesAsync(string url){var result = new Dictionary<string, string>();// MAUI获取当前版本号var currentVersion = VersionTracking.CurrentVersion;var latestVersion = await _client.GetStringAsync(url);result.Add("CurrentVersion", currentVersion);result.Add("LatestVersion", latestVersion);return result;}public void InstallNewVersion(){var file = $"{FileSystem.AppDataDirectory}/{"com.a.b.apk"}";var apkFile = new Java.IO.File(file);var intent = new Intent(Intent.ActionView);// 判断Android版本if (Build.VERSION.SdkInt >= BuildVersionCodes.N){//给临时读取权限intent.SetFlags(ActivityFlags.GrantReadUriPermission);var uri = FileProvider.GetUriForFile(Android.App.Application.Context, "com.a.b.fileprovider", apkFile);// 设置显式 MIME 数据类型intent.SetDataAndType(uri, "application/vnd.android.package-archive");}else{intent.SetDataAndType(Android.Net.Uri.FromFile(new Java.IO.File(file)), "application/vnd.android.package-archive");}//指定以新任务的方式启动Activityintent.AddFlags(ActivityFlags.NewTask);//激活一个新的ActivityAndroid.App.Application.Context.StartActivity(intent);}public async Task DownloadFileAsync(string url, Action<long, long> action){var req = new HttpRequestMessage(new HttpMethod("GET"), url);var response = await _client.SendAsync(req, HttpCompletionOption.ResponseHeadersRead);var allLength = response.Content.Headers.ContentLength;var stream = await response.Content.ReadAsStreamAsync();var file = $"{FileSystem.AppDataDirectory}/{"com.a.b.apk"}";await using var fileStream = new FileStream(file, FileMode.Create);await using (stream){var buffer = new byte[10240];var readLength = 0;int length;while ((length = await stream.ReadAsync(buffer, 0, buffer.Length)) != 0){readLength += length;action(readLength, allLength!.Value);// 写入到文件fileStream.Write(buffer, 0, length);}}}
}

2、开发检查更新页面

        Update.razor内容如下：

@page "/Check/Update"
@inherits LayoutComponentBase<div class="mine-div"><div class="update-button"><Button Icon="mdi-home" OnClick="GetVersionNew">检查更新</Button></div>
</div><Modal @ref="CenterModal" IsBackdrop="true"><ModalDialog IsCentered="true" Size="Size.Small" ShowHeader="false" ShowFooter="false"><BodyTemplate><p>正在更新请稍后...</p><p>@BytesReceived KB/@TotalBytesToReceive KB</p><BootstrapBlazor.Components.Progress IsAnimated="true" IsStriped="true" Value="Ps" Color="Color.Success" IsShowValue="true"></BootstrapBlazor.Components.Progress></BodyTemplate></ModalDialog>
</Modal>

        Update.razor.css内容如下：

.mine-div {position: relative;width: 100%;height: 100%;
}.update-button {margin-top: 5px;margin-left: 5px;
}

        Update.razor.cs内容如下：

using Microsoft.AspNetCore.Components;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace UpdateApk
{public partial class MinePage{#region 检查更新[Inject]private IUpgradeService UpgradeService { get; set; }private int Ps { get; set; }private long TotalBytesToReceive { get; set; }private long BytesReceived { get; set; }private long _unReadMsgCnt = 0;private bool _updateDialog;[NotNull]private Modal? CenterModal { get; set; }/// <summary>/// 获取最新版本/// </summary>/// <returns></returns>public async Task GetVersionNew(){try{var result = await UpgradeService.CheckUpdatesAsync($"https://xxx.com/Android/update.txt?t={DateTime.Now.ToUniversalTime().Ticks}");if (result["CurrentVersion"] != result["LatestVersion"]){var confirm = await _MsgBox.ShowDialog($"检测到新版本，是否升级" + "版本号为：" + result["LatestVersion"]);if (confirm == DialogResult.Yes){_updateDialog = true;CenterModal?.Toggle();await Task.Run(async () => await UpgradeService.DownloadFileAsync("https://xxx.com/Android/com.a.b.apk", DownloadProgressChanged));UpgradeService.InstallNewVersion();}}else{_MsgBox.Show($"当前版本已经是最新版,版本号为：" + result["LatestVersion"], AlertTypes.Success);}}catch (Exception ex){_updateDialog = false;//await InvokeAsync(StateHasChanged);_MsgBox.Show(ex.Message, AlertTypes.Error);}finally{await InvokeAsync(StateHasChanged);CenterModal?.Close();await InvokeAsync(StateHasChanged);//_MsgBox.Show("更新成功!", AlertTypes.Success);}}private void DownloadProgressChanged(long readLength, long allLength){InvokeAsync(() =>{var c = (int)(readLength * 100 / allLength);if (c > 0 && c % 5 == 0) //刷新进度为每5%更新一次，过快的刷新会导致页面显示数值与实际不一致{Ps = c; //下载完成百分比BytesReceived = readLength / 1024; //当前已经下载的KbTotalBytesToReceive = allLength / 1024; //文件总大小KbStateHasChanged();}});}#endregion}
}