Update of ListView dummy image using images from URL http
Hi guys...
Please help me with this.
I have created a ListView in QML file and filled with data received from a webservice. Since this web service provides all the images, I have to place a dummy image at this location. Then I used another method to retrieve images of the url. Now, I got the image in my CPC file. But I could not update my listview. I tried several methods. But failed.
Here is my code snippet.
ListView {
id: listView
objectName: "listView"
dataModel: ArrayDataModel {
id: myListModel
}
// Override default GroupDataModel::itemType() behaviour, which is to return item type "header"
listItemComponents: ListItemComponent {
id: listcomponent
// StandardListItem is a convivience component for lists with default cascades look and feel
StandardListItem {
title: ListItemData.postText
description: ListItemData.postDate
status: ListItemData.filePath
imageSource: "asset:///images/4.png"
}
}
layoutProperties: StackLayoutProperties {
spaceQuota: 1.0
}
horizontalAlignment: HorizontalAlignment.Fill
verticalAlignment: VerticalAlignment.Fill
}
In the PRC, I get my image like this.
void PostHttp::imageFetcher(){
const QUrl url("http:///828/828_20135312012288.png");
if (flag1 == true) {
get(url);
}
}
void PostHttp::onImageReply(){
QNetworkReply* reply = qobject_cast(sender());
QString response;
QImage img;
QString filePathWithName = "data/img/";
QString imageName;
if (reply) {
if (reply->error() == QNetworkReply::NoError) {
flag1 = false;
const int available = reply->bytesAvailable();
if (available > 0) {
const QByteArray buffer(reply->readAll());
response = QString::fromUtf8(buffer);
img.loadFromData(buffer);
img = img.scaled(40, 40, Qt::KeepAspectRatioByExpanding);
const QImage swappedImage = img.rgbSwapped();
const bb::ImageData imageData = bb::ImageData::fromPixels(
swappedImage.bits(), bb::PixelFormat::RGBX,
swappedImage.width(), swappedImage.height(),
swappedImage.bytesPerLine());
bb::utility::ImageConverter::encode(QUrl(QDir::currentPath() + "/shared/camera/img.png"), imageData, 75);
qDebug()<<"current path is "<
Thanks in advance
You can pass a QByteArray of image data coded directly to an imageView in the image property, set of QVariant::fromValue (). However, in your case you can place the uri to which you saved the image and not the bytes. Advantage: cascades puts these images in cache. If you use deterministic file names, you can avoid any networking calls or loading of images when only the populated list of point sier after be recycled.
img.loadFromData(buffer);
img = img.scaled(40, 40, Qt::KeepAspectRatioByExpanding);
img.save(QDir::currentPath() + "/shared/camera/img.png"), 0, 75);
QImage can do all this for you, without permutation of bytes.
All you have to do is then updated the datamodel.
Tags: BlackBerry Developers
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