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Qt Mobility example application: Fall Detector

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

Revision as of 13:08, 24 March 2010


Qt Mobility Example: Fall Detector Application

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 Location, Contacts and Messaging modules from the Qt Mobility APIs Beta[1] release. The application also uses the acceleration sensor of a device. But since the Sensor API module from Qt Mobility is still in technology preview state and dedicated backend implementations are not available yet for any platform, the sensor access is implemented based on parts of the Mobile Extensions package.


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

Be sure to have the Qt Mobility Beta libraries installed to both your SDK and your device to compile and run the application. Additionally you may have to modify the INCLUDEPATH option within the qt_mobility.pri file to point to the actual location of your Mobility API source folder. This step may be necessary to overcome some inconsistencies concerning the include definitions of the new Mobility APIs if they are not installed or configured properly for your SDK.


The application requires the following capabilities:

CAPABILITY = Location NetworkServices LocalServices ReadUserData WriteUserData UserEnvironment ReadDeviceData WriteDeviceData

Using the sensor evaluation tool

  • 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 Location API to get current position

#include <qmobilityglobal.h>
#include <qgeopositioninfo.h>
#include <qgeopositioninfosource.h>
// Neccessary for Qt Mobility API usage
class LocationInfo : public QObject
LocationInfo(QObject* parent) : QObject(parent)
QGeoPositionInfoSource* src = QGeoPositionInfoSource::createDefaultSource();
if (src)
connect(src, SIGNAL(positionUpdated(QGeoPositionInfo)), this,
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;
// Add contact email address
QContactEmailAddress email;
// Finally, save the contact details

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;
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);
// Save the updated field definitions back to the manager

Search for a contact based on an incoming call ID

// Create new contact detail filter
QContactDetailFilter filter;
// Specify the requested value and filter matching criteria
QString incomingNbr(+436641234567);
// 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;
// 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;
// Send message using a new service handle
QMessageService* svc = new QMessageService();
if (svc->send(msg))
qDebug(“Successfully sent message.”);
qWarning(“Failed to send message.”);
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