Difference between QQmlApplicationEngine and QtQuick2ApplicationViewer

[DerMas]

I started developing my app with Qt 5.1. So I created a new QtQuick Application with the QtCreator wizard. The Application is started with the following code in main.cpp:

@#include <QtGui/QGuiApplication>
#include "qtquick2applicationviewer.h"

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

QtQuick2ApplicationViewer viewer;
viewer.setMainQmlFile(QStringLiteral("qml/MyApp/main.qml"));
viewer.showExpanded();

return app.exec();

}@

Now with Qt 5.3 I created a new QtQuick Application with the QtCreator wizard and the startup process has changed in main.cpp:

@#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:///main.qml")));

return app.exec();

}
@

Are there any important differences between the startup strategies, like performance impacts? My Application runs on Android, if that matters.

[Vincent007]

You can run QML profiler to test the speed.