How to use Ubuntu SDK downloadmanager to download multiple files at the same time

In the previous article, "How to use Download Manager in the Ubuntu SDK to download files," We've covered how to use Singledownload to download a file. In this article, we'll show you how to use Downloadmanager to download multiple files at the same time.

We can create a simple ' QML App with Easy UI (qmlproject) ' project in the same way. A specific description of the API for Downloadmanager can be specific to an article. This is no longer a statement of exhaustion. We can declare an example of a downloadmanager:

        Downloadmanager {            Id:manager            ondownloadschanged: {                Console.log ("Something is changed!");                var length = downloads.length;                Console.log ("Length:" + length);                for (var i = 0; i < length; i + +) {                    downloads[i].finished.connect (onfinished);                }                function onfinished (path) {                    Console.log ("path:" + path);                    Mymodel.append ({"FileName": Path})}}}        

Remember to add the following libraries:

Import Ubuntu.downloadmanager 0.1

Here, in order to get the information of the downloaded file, we capture the signal "ondownloadschanged" and make a dynamic signal/slot binding to it:

                for (var i = 0; i < length; i + +) {                    downloads[i].finished.connect (onfinished);                }

So we can get the downloaded file. There is nothing special about the others. This is to understand that each of the downloads is singledownload. It's not hard to understand.

We have modified our main.qml as follows:

Import QtQuick 2.0import ubuntu.components 1.1import ubuntu.downloadmanager 0.1/*! \brief MainView with a Label and Button Elements.*/mainview {//ObjectName for functional testing purposes (autopilot- QT5) ObjectName: "MainView"//note!    ApplicationName needs to match the "name" field of the click Manifest ApplicationName: "Downloadmanager.liu-xiao-guo" /* The enables the application to change orientation when the device is rotated.    The default is False.    *///automaticorientation:true//Removes the old toolbar and enables new features of the new header. Usedeprecatedtoolbar:false width:units.gu (height:units.gu) page {title:i18n.tr ("Download manag ER ") listmodel {Id:mymodel} downloadmanager {Id:manager ondownl                Oadschanged: {Console.log ("Something is changed!");                var length = Downloads.length; Console.log ("LenGth: "+ Length";                for (var i = 0; i < length; i + +) {downloads[i].finished.connect (onfinished);                    } function onfinished (path) {Console.log ("path:" + path);            Mymodel.append ({"FileName": Path})}}} TextField {Id:text Placeholdertext: "File URL to download ..." Height:units.gu (5) Anchors {left:p Arent.left right:button.left RightMargin:units.gu (2)} text: "http:/ /img0.bdstatic.com/img/image/6446027056db8afa73b23eaf953dadde1410240902.jpg "} button {Id:butto N Text: "Download" height:50 anchors.top:text.top Anchors.bottom:text.botto        M anchors.right:parent.right anchors.verticalCenter:text.verticalCenter onclicked: {        Manager.download (Text.text); }} ListView {id:list clip:true anchors {left:parent.le            FT right:parent.right Top:text.bottom} height:units.gu (20) Model:manager.downloads Delegate:progressbar {width:parent.width MINIMUMV            alue:0 maximumvalue:100 Value:modelData.progress}} GridView {            Id:pics clip:true Anchors.bottom:parent.bottom Anchors.left:parent.left Anchors.right:parent.right Anchors.top:list.bottom Model:mymodel Cellwidth:p ICS.WIDTH/4; Cellheight:cellwidth + units.gu (2) delegate:image {WIDTH:PARENT.WIDTH/4 hei Ght:width + units.gu (2) Source:filename Fillmode:imaGe. Preserveaspectfit}}}}

Run the app, shown as:

We can modify the link address of the download, or you can press the download button directly. Each time a new download is generated. Let's show the pictures.

All source code in: Git clone https://gitcafe.com/ubuntu/downloadmanager.git

How to use Ubuntu SDK downloadmanager to download multiple files at the same time