创建传感器插件

传感器插件的加载方式

由于传感器后端是按需创建的，因此会加载传感器插件，并要求其注册所处理的传感器后端。插件应实现QSensorPluginInterface::registerSensors()方法，并调用QSensorManager::registerBackend()方法来注册可用的后端。通常，插件还会继承自QSensorBackendFactory 类，并实现QSensorBackendFactory::createBackend()方法，以便实例化已注册的后端。

最简单的插件通常只包含一个传感器后端，但也没有理由限制一个插件不能包含多个传感器后端。

下面是一个示例。

class MyPluginClass : public QObject, public QSensorPluginInterface, public QSensorBackendFactory
{
    Q_OBJECT
    //Q_PLUGIN_METADATA(IID "com.qt-project.Qt.QSensorPluginInterface/1.0" FILE "plugin.json")
    Q_INTERFACES(QSensorPluginInterface)
public:
    void registerSensors() override
    {
        QSensorManager::registerBackend(QAccelerometer::sensorType, MyBackend::id, this);
    }

    QSensorBackend *createBackend(QSensor *sensor) override
    {
        if (sensor->identifier() == MyBackend::id)
            return new MyBackend(sensor);
        return 0;
    }
};

Qt Sensors 后端确定某类型的默认传感器

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