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Revision as of 05:44, 12 March 2012 by hamishwillee (Talk | contribs)

Qt Mobility example application: Fall Detector

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Code ExampleCompatibility
Platform(s):
Symbian
Article
Created: domgus (05 Mar 2010)
Last edited: hamishwillee (12 Mar 2012)

The Fall Detector demo application automatically detects when a person falls down and provides a simple notification facility for detected downfalls (e.g. to request first aid etc.). In general the given example application demonstrates the utilization of Sensor, Location, Contacts and Messaging modules from the Qt Mobility APIs Beta[1] release


Falldetector--screens.png

Contents

Build Instructions

Download the File:Falldetector.zip and unzip it somewhere. Move to that directory and build it with

  • qmake
  • make <cfg>

where <cfg> is a wildcard for your current build configuration and target (for example debug-gcce, release-gcce etc.)

Project Dependencies

Install the Qt SDK

Capabilities

The application requires the following capabilities:

CAPABILITY = Location NetworkServices LocalServices ReadUserData WriteUserData UserEnvironment ReadDeviceData WriteDeviceData

Using the fall detector application

  • Start the fall detector application
  • If the application is started for the first time, you will be prompted to enter some notification details (name and email address). This details will be saved in your local contact store. In case of a detected fall the application uses the given email address for notification as well.

Code Snippets

Using the Sensor API to get current device acceleration

#include <QAccelerometer>
 
// Neccessary for Qt Mobility API usage
QTM_USE_NAMESPACE
 
class AccelerationInfo : public QObject, public QAccelerometerFilter
{
Q_OBJECT
 
public:
 
AccelerationInfo(QObject* parent = 0) : QObject(parent)
{
m_sensor = new QAccelerometer(this);
m_sensor->addFilter(this);
m_sensor->start();
}
 
private slots:
 
// Override of QAcclerometerFilter::filter(QAccelerometerReading*)
void filter(QAccelerometerReading* reading)
{
qreal x = reading->x();
qreal y = reading->y();
qreal z = reading->z();
 
// Process acceleration sensor readings ...
 
qDebug("Current device acceleration: x=%f y=%f z=%f", x, y, z);
}
 
private:
 
QAccelerometer* m_sensor;
};

Using the Location API to get current position

#include <QGeoPositionInfo>
#include <QGeoPositionInfoSource>
 
// Neccessary for Qt Mobility API usage
QTM_USE_NAMESPACE
 
class LocationInfo : public QObject
{
Q_OBJECT
 
public:
 
LocationInfo(QObject* parent = 0) : QObject(parent)
{
QGeoPositionInfoSource* src = QGeoPositionInfoSource::createDefaultSource(this);
if (src)
{
connect(src, SIGNAL(positionUpdated(QGeoPositionInfo)), this,
SLOT(updatePosition(QGeoPositionInfo));
connect(src, SIGNAL(updateTimeout()), this, SLOT(updateTimeout()));
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.”);
}
};

Using the Contacts API

Create an example contact and populate it with data

// Construct contact manager for default contact backend
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);

Add custom field Interests to a note detail associated with a contact

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

Search for a contact based on an incoming call ID

// 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);
 
// 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));


Using the Message API to send an email message with a photo attachment

// Setup new email message
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,\n\nthis 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.”);
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