我們做的比較簡單，在后端設置版本號，并在uniapp的config.js中定義版本號，每次跟后端的進行對比，不一致的話就更新。

一、下載apk

主要代碼（下載安裝包，并進行安裝，一般得手動同意安裝）

const uploadTask = uni.downloadFile({ // 下載apk/資源包url: 'xxx',//下載apk的地址success: (downloadResult) => {console.log(downloadResult);if (downloadResult.statusCode === 200) {// uni.clearStorage()plus.runtime.install(downloadResult.tempFilePath, {force: true},function() {plus.runtime.restart(); // 重啟APP  },function(e) {_this.show = falseuni.showToast({title: e.message,icon: 'none'})});} else {_this.show = falseif (_this.updateType === 1) {uni.showToast({title: '資源包下載失敗',duration: 2000,icon: 'error'})} else {uni.showToast({title: 'APK下載失敗',duration: 2000,icon: 'error'})}}}});

?二、監聽下載進度

//監聽下載進度 uploadTask.onProgressUpdate((res) => {_this.updateProgress = res.progress  //下載進度  0-100if (_this.updateType === 1) {if (res.progress > 95) {// _this.restartFlag = true}}});

三、全部代碼

dialog.vue

<template><view class="uploadCon"  v-if="show"><view class="uploadBox"><!-- 版本信息彈窗 --><view class="dialogBox"><view class="circle"><image src="@/static/images/icons/upload.png" mode="widthFix"></image></view><view class="needLoad" v-if="versionsFlag === 1"><view class="title">{{updateType === 1?'最新資源包':'發現新版本'}} V{{getVersion}}</view><view class="tips"><view>電子秤檢測到新版本，請更新后使用!</view></view><view class="buttonCon"><!-- <view class="button button2" @click="show = false">暫不更新</view> --><view class="button button1" @click="updateNow">立即更新</view></view></view><view class="loadingBox" v-if="versionsFlag === 3"><view class="title">正在下載,請稍后 </view><view><progress :percent="updateProgress" show-info stroke-width="20" /></view></view></view></view></view>
</template><script>import {appInfo,} from "@/config.js"import {uploadSys} from "@/api/system/user.js"import {getToken} from "@/api/login.js"export default {data() {return {// 版本更新相關version: '', //版本名稱versionCode: '', //版本號  當前getVersion:'',//最新版本apkUpdateContent: '', //更新內容說明updateType: '', //1資源包更新2版本更新versionsFlag: 1, //1需要更新彈窗2已是最新版本彈窗3正在下載latestVersionInfo: '', //已是最新版本彈窗內容updateAPKPath: '', //下載文件路徑updateProgress: 0, //下載進度restartFlag: false,show: false}},mounted() {this.update();},methods: {update() {let _this = thislet platform = uni.getSystemInfoSync().platformlet server = '***********************'let signServer = '***********************'// 當前版本信息this.versionCode = appInfo.version; //版本號uploadSys({}).then(response => {this.getVersion = response.rows[0].dictValue;if (this.versionCode == this.getVersion) {//已經是最新版本} else {this.show = true//要更新this.versionsFlag = 1;}})},//彈窗點擊確認更新以后updateNow() {let _this = this_this.versionsFlag = 3const uploadTask = uni.downloadFile({ // 下載apk/資源包url: 'xxx',//apk下載地址，更換成你自己的success: (downloadResult) => {console.log(downloadResult);if (downloadResult.statusCode === 200) {// uni.clearStorage()plus.runtime.install(downloadResult.tempFilePath, {force: true},function() {plus.runtime.restart(); // 重啟APP  },function(e) {_this.show = falseuni.showToast({title: e.message,icon: 'none'})});} else {_this.show = falseif (_this.updateType === 1) {uni.showToast({title: '資源包下載失敗',duration: 2000,icon: 'error'})} else {uni.showToast({title: 'APK下載失敗',duration: 2000,icon: 'error'})}}}});//監聽下載進度 uploadTask.onProgressUpdate((res) => {_this.updateProgress = res.progressif (_this.updateType === 1) {if (res.progress > 95) {// _this.restartFlag = true}}});},}}
</script><style scoped lang="scss">@import "@/static/scss/dialog.scss";</style>

dialog.scss

.uploadCon{position: fixed;top: 0;left: 0;right: 0;bottom: 0;z-index: 100;background-color: rgba(0,0,0,0.6);.uploadBox{position: fixed;width: 24%;height: 40%;top: 30%;left: 38%;z-index: 1000;background-image: -webkit-linear-gradient(top, #fff,#f4f8ff, #e4ecfb, #c7d9fc);border: 1px solid #fff;border-radius: 15rpx;box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);.dialogBox{display: flex;flex-direction: column;padding: 10% 15% 0%;height: 67%;position: relative;.needLoad{height: 100%;display: flex;flex-direction: column;justify-content: space-between;}.loadingBox{height: 100%;display: flex;flex-direction: column;justify-content: space-around;}.circle{position: absolute;left: 0;right: 0;width: 14vh;height: 14vh;margin: 0 auto;top: -7vh;background-color: #fff;border-radius: 100%;display: flex;justify-content: center;align-items: center;image{width: 8vh;}}.title{margin-top: 30rpx;text-align: center;// line-height: 90rpx;font-size: 50rpx;font-weight: bold;}.buttonCon{display: flex;justify-content: space-between;.button{line-height: 90rpx;border-radius: 10rpx;text-align: center;width: 100%;font-size: 34rpx;}.button1{background-color: #336edf;color: #fff;}.button2{background-color: #fff;color: #7d7d7d;}.tips{font-size: 34rpx;line-height: 60rpx;}}}}
}

四、下載到安卓指定位置

uni.downloadFile設置下載文件的路徑，但不能指定下載到設備的某個路徑下，用plus.downloader.createDownload可以實現，代碼還提供了替換功能。

代碼如下：

            //下載人臉文件updateNow() {this.saveFileWithCN('https://xxx/statics/datFile/Users.dat', 'Users.dat')},saveFileWithCN(fileUrl, customFileName) { // 文件下載地址, 自定義文件名const defaultPathPrefix = "/sdcard/Documents";  //下載到內存Documents文件下const fullPath = `${defaultPathPrefix}/${customFileName}`;console.log(fullPath)// 3. 檢查并刪除已存在的文件（實現替換功能）const File = plus.android.importClass('java.io.File');const targetFile = new File(fullPath);// uni.showLoading({// 	title: '核心文件下載中...',// 	mask: true// });this.tips = '核心文件下載中...';if (targetFile.exists()) {targetFile.delete(); // 刪除舊文件console.log("已刪除舊文件:", fullPath);}const dtask = plus.downloader.createDownload(fileUrl, {filename: fullPath}, (d, status) => {if (status === 200) {console.log("保存路徑：", d.filename);this.tips = '核心文件下載完成!';uni.setStorageSync('update',true);this.initFaceModule();setTimeout(() => {this.tips = ''}, 1000)} else {this.tips = '核心文件下載失敗!';setTimeout(() => {this.tips = ''}, 1000)}});dtask.start();},

五、運行結果

?