sgApp/src/providers/update.ts

import { Injectable } from '@angular/core';

import { FileOpener } from '@ionic-native/file-opener/ngx';
import { FileTransfer, FileTransferObject } from '@ionic-native/file-transfer/ngx';
import { AppVersion } from '@ionic-native/app-version/ngx';
import { File } from '@ionic-native/file/ngx';
import { AlertController, LoadingController } from '@ionic/angular';
import { HTTP } from '@ionic-native/http/ngx';

@Injectable({
    providedIn: 'root'
})

export class Update {
    constructor(private file: File,
        private transfer: FileTransfer,
        private nativeHttp: HTTP,
        private appVersion: AppVersion,
        private fileOpener: FileOpener,
        private loadingCtrl: LoadingController,
        public alertController: AlertController) {
    }

    //设备加载完成再去调用硬件

    // ngAfterContentInit(): void {
    //     //Called after ngOnInit when the component's or directive's content has been initialized.
    //     //Add 'implements AfterContentInit' to the class.
    //     this.isUpdate();
    // }

    async isUpdate() {
        // 1、获取当前应用的版本号
        // console.log(this.appVersion.getAppName())
        let server_version_number = await this.getServerVersionNumber()
        let version_number = await this.getVersionNumber()
        if (version_number !== server_version_number) {
            this.showAlert(server_version_number);
        }

    }

    getVersionNumber() {
        return new Promise((resolve, reject) => {
            this.appVersion.getVersionNumber().then((value: any) => {
                resolve(value)
            }).catch(err => {
                console.log('getVersionNumber:' + err);
                return
            });
        })
    }

    getServerVersionNumber() {
        return new Promise((resolve, reject) => {
            this.nativeHttp.get('http://app.sgsino.cn/version.json', {}, {})
                .then(data => {
                    resolve(JSON.parse(data.data).version)
                })
                .catch(error => {
                    console.log(error.status);
                    console.log(error.error); // error message as string
                    console.log(error.headers);

                });
            // from(this.nativeHttp.get(`http://192.168.20.15:803/SoftUpdate/SgApp/version.txt`,
            //     {},
            //     {})).pipe(
            //         finalize(() => { })
            //     ).subscribe(data => {
            //         console.log(JSON.parse(data.data).version)
            //         resolve(JSON.parse(data.data).version)
            //     }, async err => {
            //         console.log(err)
            //     });
            // return
        })
    }

    setLoadingText(text: string) {
        const elem = document.querySelector(
            "div.loading-wrapper div.loading-content");
        if (elem) elem.innerHTML = text;
    }

    async showAlert(version) {
        //3.弹窗提示用户是否更新    
        const alert = await this.alertController.create({
            header: '升级!',
            message: `发现新版本(${version}),是否立即升级？`,
            buttons: [
                {
                    text: '取消',
                    role: 'cancel',
                    cssClass: 'secondary',
                    handler: (blah) => {
                    }
                }, {
                    text: '确认',
                    handler: () => {
                        //4.下载apk
                        this.downloadApp();
                    }
                }
            ]
        });
        await alert.present();

    }


    async downloadApp() {
        //4.下载apk
        const targetUrl = 'http://192.168.20.15:803/SoftUpdate/SgApp/app-debug.apk';
        const fileTransfer: FileTransferObject = this.transfer.create();
        //获取当前应用的安装（home）目录     1、应用包名称要一致   2、升级的包的版本号要大于当前应用的版本号   3、签名要一致    4、sdk 要安装

        fileTransfer.download(targetUrl, this.file.externalDataDirectory + 'app-debug.apk').then((entry) => {
            //6、下载完成调用打开应用

            this.fileOpener.open(entry.toURL(),
                'application/vnd.android.package-archive')
                .then(() => {
                    console.log('File is opened')
                })
                .catch(e => {
                    console.log('Error openening file', e)
                });


        }, (error) => {
            alert(JSON.stringify(error));
        });

        let loading = await this.loadingCtrl.create({
            message: '下载进度：0%'
        })
        await loading.present()

        //5、获取下载进度    
        fileTransfer.onProgress(async (event) => {
            let num = Math.ceil(event.loaded / event.total * 100);  //转化成1-100的进度
            this.setLoadingText(`下载进度：${num}%`)
            if (num === 100) {
                loading.dismiss()
            }
        });

    }
}