Since sensor backends are created on demand, the sensor plugin is loaded and asked to register the sensor backends it handles. The plugin should implement QSensorPluginInterface::registerSensors() and call QSensorManager::registerBackend() to register available backends. Typically the plugin will also implement QSensorBackendFactory::createBackend() in order to instantiate backends it has registered.
The simplest plugin will have just once sensor backend although there is no reason that multiple sensor backends cannot be in a plugin.
An example follows.
class MyPluginClass : public QObject, QSensorPluginInterface, public QSensorBackendFactory
{
Q_OBJECT
Q_INTERFACES(QtMobility::QSensorPluginInterface)
public:
void registerSensors()
{
QSensorManager::registerBackend(QAccelerometer::type, MyBackend::id, this);
}
QSensorBackend *createBackend(QSensor *sensor)
{
if (sensor->identifier() == MyBackend::id)
return new MyBackend(sensor);
return 0;
}
};
If you would like to build a backend into a library or application you can use the REGISTER_STATIC_PLUGIN() macro although it may not work in all situations as it uses static initialization.