Dominik Gusenbauer Qt Mobility

Qt is © 2009 Nokia Corporation and/or its subsidiaries. Nokia, Qt, Qt Development Frameworks and their respective
logos are trademarks of Nokia Corporation in Finland and/or other countries worldwide.

Qt Mobility is not about supplying ready made
solutions but delivering the means to create great
software using your own skill and creativity.
f k ll d

Inspire your creativity for using the new Qt Mobility APIs
Inspire your creativity for using the new Qt Mobility APIs
in your own projects and developments.

Dominik Gusenbauer, 2010 2

Q g
Qt Background

The Qt Mobility Project

Overview of new Mobility APIs
Introducing description
Some code snippets
Example application (http://bit.ly/cgRI7V)
E l li i (h //bi l / RI7V)

Open Discussion/Development
Open Discussion/Development


Q y p
Qt traditionally based in the desktop world
Cross‐platform application and UI framework
Linux
Mac OS‐X
Windows

Previous ports to embedded platforms
Simple port of desktop APIs
No specific APIs for mobile platforms
N ifi API f bil l tf


y ( )
Takeover of Trolltech by Nokia (2008)
Availability of additional features through mobile domain
Location
Sensors
etc.

Need for specific APIs to support mobile device functionality on
particular platforms (Symbian, Maemo, Windows Mobile/CE)
particular platforms (Symbian Maemo Windows Mobile/CE)

Solution: Qt Mobility
S l ti Qt M bilit


y g y g
The Mobility APIs generally intend to be an enabling
technology.

New Qt APIs add support for mobile device functionality
pp y
Enlarge developer offering irrespective of actual platform
Functional back‐ends implementation on all platforms where
it makes sense
Simplify cross‐platform transfer of applications even between
desktop and mobile world


p pp
Scope of application

Application Use Cases

80 % of Application Use Cases

Native Platform
New Qt Developer Offering
APIs

Native Platform

Symbian Maemo Win. Mobile/CE Others

Source: A. Luddy – The Mobility Project, 2009


p
Roadmap

Q1 2009 Q2 2009 Q3 2009 Q4 2009 Q1 2010 …
Q1 2009 Q2 2009 Q3 2009 Q4 2009 Q1 2010 …

Qt Mobile Extensions Qt Mobile Extensions Qt Mobile Extensions Qt Mobility APIs Qt Mobility APIs
(Techn. Preview 1) (Techn. Preview 2) (Techn. Preview 3) (Technology Preview) (Beta Release)

Qt 4.5 Garden Qt 4.5 Garden Qt 4.5.2 Tower Qt 4.6 Qt 4.6 API Completeness
Early preview of Enhancement of Major Major changes to Added preview for Calendar
mobile APIs (pre‐ the TP 1 package enhancements of Mobile Extensions Sensors API and Location and
alpha stage) previous packages Installer package Camera API Landmarks
Added Alarms and of pre‐built libs Enhanced example Sensors
AP Manager
AP‐Manager Qt Mobility Project
Qt Mobility Project Calendar API
Calendar API applications
Audio announced Added email Bearer Management Full Release of
Camera support within Contacts Mobility Project
Contacts Messaging API Location
Landmarks Installer package Messaging
Location of pre‐built libs Multimedia
Media
d Publish and Subscribe
bl h d b b
Messaging Service Framework
Profile System Information
Sensors Versit
System Information
Telephony
p y
Vibra
Source: http://qt.nokia.com/developer/qt‐roadmap


p y
Platform Compatibility

S60 rd Edition

S60 th Edition
Functional back‐end

mbian 10.1
API Maturity

mbian 9.2
implementation available.

CE/Mobile
1, FP2)

ndows

ndows

c OS‐X
emo 5

emo 6

XP/Vista
Functional back‐end

0 3

0 5

ux
el
Leve

Mae

Mae
(FP1

Mac
Sym

Sym

Linu
Win

Win
implementation available
but not complete.
Service
BETA Work on functional back‐
Framework API
end implementation. No
Messaging API
g g BETA platform specific code
inside Qt API.
Bearer
BETA No functional back‐end
Management API
implementation.
Publish and
BETA
Subscribe API

Contacts API BETA

Location API BETA

Multimedia API BETA

System
BETA
Information API

Sensor API TP

Camera API
Camera API TP

Versit API TP

Source: http://qt.nokia.com/doc/qtmobility‐1.0‐beta/index.html#platform‐compatability
9

We want to create a…
mobile application
which is cross‐platform

Scenario/Idea: Fall Detection Agent
/ g
Automatically detects when a person falls down
Notification of predefined contact person(s) – first aid,
emergency, …


p
Purpose
Provides access to various hardware sensors on a device

Supports both low‐level, real‐time sensors (accelerometer
etc.) and high level sensors (device orientation etc.)
etc.) and high‐level sensors (device orientation etc.)
Each sensor provides certain update policies (polling, timed
updates, on value changed etc.)
updates on value changed etc )
Plugin based approach – utilizes dedicated
backend library implementations for
backend library implementations for
concrete hardware sensor access
Note: The Sensor API is still in a technology preview state
N t Th S API i till i t h l i t t
and under development or subject to change respectively.

Basic architecture overview
Holds the actual
Base class for concrete sensor readings.
hardware sensors.
Interface – provides callback
QSensorReading facility for async. notifications.

1 *
QSensor
QS QSensorFilter
QS Filt Supported hardware sensors:
S t dh d
‐ Accelerometer
‐ Ambient Light Sensor
QSensorManager ‐ Compass
‐ Magnetometer
‐ Orientation Sensor
<< creates, instantiates >> ‐ Proximity Sensor
‐ Rotation Sensor
QSensorBackend ‐ Tap Sensor

Symbian Sensor Maemo Sensor … QSensorBackend instance is created by a
(backend) (backend) (backend) factory class for concrete sensor on demand
factory class for concrete sensor on demand.


int main(int argc, char** argv) {
QCoreApplication app(argc, argv);

// Try to instantiate sensor class AccelerometerFilter
QAccelerometer sensor; : public QAccelerometerFilter
sensor.connect(); {
if (!sensor isAvailable()) {
(!sensor.isAvailable()) public:
qWarning(“Sensor not available.”); bool filter(QAccelerometerReading* r) {
return 1; QString format(“%0.2f %0.2f %0.2f”);
} qDebug() << “Acceleration: “
<< QString().sprintf(format,
// U
Use async. callback facility
llb k f ilit r >x(),
r->x()
// instead of signals and slots r->y(),
// (faster) r->z());
AccelerometerFilter filter;
sensor.setSignalEnabled(false); // Do not store the reading in the
sensor.addFilter(&filter); // sensor
// Set update interval as fast as return false;
// the sensor can go }
sensor.setUpdateInterval(100); }
// Start sensor Process actual sensor
sensor.start(); reading.

return app.exec();
}
Reading actual device
Reading actual device
acceleration from sensor.


Features we need …
Acceleration sensor readings
Current location
Contacts for notification
Messaging for notification


p
Purpose
Receive, access and distribute location data using arbitrary and
independent data sources
independent data sources

Stream location information
Stream location information
Abstracts underlying location technology
(GPS, Cell Network, WiFi etc.)
(GPS Cell‐Network WiFi etc )
Provides notifications when entering or
leaving specified location range
leaving specified location range
Simplifies implementation of custom
position data sources
position data sources


Actual position data: Longitude,
Latitude, Altitude, Bearing etc. Actual satellite information:
number of satellites, signal
b f t llit i l
strengths, satellite elevation etc.

QGeoPositionInfo
Enables the detection of proximity
Enables the detection of proximity
QGeoCoordinate QGeoSatelliteInfo changes for a specified set of
coordinates.

QGeoPositionInfoSource QGeoSatelliteInfoSource QGeoAreaMonitor

Basic Location API

Symbian Location
Maemo Location API … Serial NMEA Source
Acquisition API

Qt software emulation


Requesting actual location
class LocationInfo : public QObject { information from data source.
information from data source
Q_OBJECT

public:
LocationInfo(QObject* parent) : QObject(parent) {
QGeoPositionInfoSource
QGeoPositionInfoSource* src =
QGeoPositionInfoSource::createDefaultSource();
if (src) {
connect(src, SIGNAL(positionUpdated(QGeoPositionInfo)),
this, SLOT(updatePosition(QGeoPositionInfo));
connect(src, SIGNAL( d t Ti
t( SIGNAL(updateTimeout()), thi
t()) this, SLOT( d t Ti
SLOT(updateTimeout()));
t()))
src->requestUpdate(5000); // Start request for actual position
}
}

private slots:
void updatePosition(const QGeoPositionInfo& info) {
qDebug() << “Current position: ” << info;
}
void updateTimeout() {
// Current location could not be retrieved within the specified timeout
// of 5 seconds.
qWarning(“Failed to retrieve current position.”);
}
}


Current location


p
Purpose
Management of contact data in a platform independent and
datastore‐agnostic way
datastore‐agnostic way

Introduces a generic abstraction level
Introduces a generic abstraction level
for personal information data
Use of contact data stores (local and remote)
Use of contact data stores (local and remote)
Supports asynchronous operations on data
stores (enabling remote contact stores)
stores (enabling remote contact stores)
Modify and introspect available contact data
Add application specific data to contacts (attributes etc.)

Contact name, address, phone
number etc. Provides specification for a detail
in any particular contact. Defines
semantics of the representation
QContactDetail and use of data details.

QContact Detail Definition QAbstractContactRequest
QMap<Qstring, QContactDetailDefinition>
QMap<Qstring, QContactDetailDefinition>

create, read, update, delete query and update asynchronous operations

QContactManager

QContactManagerEngine (plugin)
QC t tM E i plugin)
l i

Symbian Contact Meamo Contact
Default Store Other Contact Store
Store Store



// Construct contact manager for default contact backend
g
QContactManager* cm = new QContactManager();
// Create example contact
QContact example;

// Add contact name
QContactName name;
name.setFirst(“John”);
name.setLast(“Doe”);
( )
example.saveDetail(&name);

// Add contact email address
QContactEmailAddress email;
email.setContexts(QContactDetail::ContextHome);
email.setEmailAddress(“john.doe@example.com”);
example.saveDetail(&email);

// Finally, save the contact details
cm->saveContact(&example);
Create an example contact and
populate it with data.


// Get the contact definition we want to modify (
y (cm is a
// previously created QContactManager object)
QMap<QString, QContactDetailDefinition> def =
cm->detailDefinitions();
Q
QContactDetailDefinition modified =
def.value(QContactNote::DefinitionName);

// Define new field ‘Interests’
Q
QContactDetailDefinitionField field;
field.setDataType(QVariant::String);
QMap<QString, QContactDetailDefinitionField> fields =
modified.fields();

// Insert new field to the list of contact’s fields and update
// the contact’s field definitions
fields.insert(“Interests”, field);
modified.setFields(fields);

// Save the updated field definitions back to the manager
cm->saveDetailDefinition(modified);
Add custom field Interests to a note
Add custom field “Interests” to a note
associated with a contact.


// Create new contact detail filter
QContactDetailFilter filter;
filter.setDetailDefinitionName(QContactPhoneNumber::DefinitionName,
QContactPhoneNumber::FieldNumber);

// Specify the requested value and filter matching criteria
QString incomingNbr(“+436641234567”);
filter.setValue(incomingNbr);
filter.setMatchFlags(QContactFilter::MatchExactly);
g (Q y)

// Fetch matching contacts list for specified filter (cm is a
// previously created QContactManager object)
QList<QContactLocalId> matches = cm->contacts(filter);

for (int i = 0; i < matches.size(); ++i)
qDebug() << cm->contact(matches.at(i));

Search for a contact based on an
f
incoming phone call id.


Current location


p
Purpose
Provide a common interface for handling Email, SMS and MMS
messages

Send and retrieve messages (with or without attachments)
Send and retrieve messages (with or without attachments)
Notification of new messages
Work with stored or remote messages
k h d
Launches preferred messaging client for
displaying or composing of messages
Access and manage message accounts
defined on device

Each message has an associated
message account and where
QMessageServiceAction
QM S i A ti i t d l i t d
appropriated also an associated Single Message store for the
message folder. platform but multiple message
send, query, retrieve accounts (for each message type).

QMessage Has A

QM F ld
QMessageFolder QM A t
QMessageAccount

QMessageStore
(messages, folders, accounts)

Platform message services



Send an email message with a photo
// Setup new email message attachment using the messaging API.
QMessage msg;
msg.setType(QMessage::Email);

// Set recipient for our email message
QString recipient(“john.doe@example.com”);
msg.setTo(QMessageAddress(QMessageAddress::Email, recipient));

// Define message subject, body and append attachment
msg.setSubject(“Messaging API example”);
msg.setBody(“Hello,nnthis is an example message.”);

QStringList attachments;
attachments << “images/example.png”;
msg.appendAttachments(attachments);

// Send message using a new service handle
QMessageService* svc = new QMessageService();

if (svc->send(msg))
qDebug(“Successfully sent message.”);
else
qWarning(“Failed to send message.”);


Current location


g
Bearer Management
Controls the application’s connectivity state and enables
seamless management and selection of connections

Multimedia
Provides an easy way to play, record and manage a collection of
P id l d d ll i f
media content of various formats

System Information
Offers a simple interface to access system related information
and capabilities of a device


( gy p
Camera API (technology preview) )
Provides interfaces for utilizing the system’s camera devices.

Versit (technology preview)
Enables parsing and encoding of Versit® documents such as
vCards as well as importing and exporting contact data from
C d ll i i d i d f
and to Versit® documents

Calendar (coming soon)


Publish and Subscribe
Serves primarily as a means of easy inter‐process
communication with additional notification capability
communication with additional notification capability
Enables context sensitive access to various unified sources of
hierarchical data
hierarchical data
Uses key‐value (key: QString, value:
QValueSpacePublisher publisher(“/Location”);
QV l S P bli h bli h (“/L ti ”) QVariant) tuples to store data.
QVariant) tuples to store data
publisher.setValue(“City”, “Vienna”);
publisher.setValue(“ZIP”, 1010);
publisher.setValue(“Street”, “Opernring”);
publisher.setValue(“Number”, 2)
bli h tV l (“N b ” 2);
publisher.sync(); // Usually not required This defines four keys:
‐ /Location/City
‐ /Location/ZIP
‐ /Location/Street
‐ /Location/Number


Service Framework
QObject

Provides a unified way of finding,
implementing and accessing
implementing and accessing Qt S i F k
Qt Service Framework
services across multiple platforms service interface

Service: an independent component
Service: an independent component Service Provider
that allows a client to perform a well
dll
defined operation
p
Qt Mobility API

Symbian Maemo Windows …
(backend)
( ) ( )
(backend) (backend)
( ) ( )
(backend)
Note: Both Publish and Subscribe API as well
Note: Both Publish and Subscribe API as well
as Service Framework API are more focused
on the development of a system rather than
Symbian Maemo Windows …
an application.
Source: Qt Mobility Whitepaper, 2010


p pp
Development of application scenario
(Fall Detection Agent)
http://bit.ly/cgRI7V
http://wiki.forum.nokia.com/index.php/Qt_Mobility_example_application:_Fall_Detector

Questions ?

For latest Information on Qt Mobility visit
http://labs.qt.nokia.com/page/Projects/QtMobility
h //l b ki / /P j /Q M bili


Alex Luddy. The Mobility Project. Technical Session at Qt Developer Days 2009,
Munich.
F.H.P. Fitzek, Tommi Mikonen and Tony Torp. Qt for Symbian. John Wiley & Sons,
2010.
Forum Nokia Online. Qt Mobility Project: http://discussion.forum.nokia.com/
forum/showthread.php?t=193452.
Qt Labs Online. Qt Mobility Project: http://labs.qt.nokia.com/page/Projects/
QtMobility.
Qt Mobility Project Online. New Qt APIs Beta: http://qt.nokia.com/developer/
Q M bili P j O li N Q API B h // ki /d l /
new‐qt‐apis.
y j ,
Qt Mobility Project 1.0.0 API Documentation. Nokia, 2009.
Qt Mobility Whitepaper 2010: http://qt.nokia.com/files/pdf/qt‐mobility‐
whitepaper‐1.0.0. Nokia, 2010
Qt Online Documentation: http://qt.nokia.com. Nokia, 2010.

34

Dominik Gusenbauer Qt Mobility

Dominik Gusenbauer Qt Mobility

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