如何使用UserMetric发布消息到Welcome Screen

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我们可以通过UserMetric的API发布消息到我们手机的欢迎页面（手机的锁屏界面）。在锁屏界面中，我们可以双击中间的圆圈，来循环播放我们手机发布的消息。如下图所示，

我们发布了“Useermetric messages received: 4”个消息。

我们需要使用的模块是:

import UserMetrics 0.1

我们可以使用如下的方法得到它所有的API:

liuxg@liuxg:~$ qmlplugindump import UserMetrics 0.1QQmlComponent: Component is not readyliuxg@liuxg:~$ qmlplugindump  UserMetrics 0.1import QtQuick.tooling 1.1// This file describes the plugin-supplied types contained in the library.// It is used for QML tooling purposes only.//// This file was auto-generated by:// 'qmlplugindump UserMetrics 0.1'Module {    Component {        name: "Metric"        prototype: "QObject"        exports: ["Metric 0.1"]        exportMetaObjectRevisions: [0]        Property { name: "name"; type: "string" }        Property { name: "format"; type: "string" }        Property { name: "emptyFormat"; type: "string" }        Property { name: "domain"; type: "string" }        Property { name: "minimum"; type: "double" }        Property { name: "maximum"; type: "double" }        Method {            name: "increment"            Parameter { name: "amount"; type: "double" }        }        Method { name: "increment" }        Method {            name: "update"            Parameter { name: "value"; type: "double" }        }    }}

我们的应用非常简单：

Main.qml

import QtQuick 2.0import Ubuntu.Components 1.1import UserMetrics 0.1/*!    \brief MainView with a Label and Button elements.*/MainView {    // objectName for functional testing purposes (autopilot-qt5)    objectName: "mainView"    // Note! applicationName needs to match the "name" field of the click manifest    applicationName: "usermetrics.liu-xiao-guo"    /*     This property enables the application to change orientation     when the device is rotated. The default is false.    */    //automaticOrientation: true    // Removes the old toolbar and enables new features of the new header.    useDeprecatedToolbar: false    width: units.gu(60)    height: units.gu(85)    Page {        title: i18n.tr("usermetrics")        Metric {            id: incomingMessagesMetric            name: "usermetric"            format: i18n.tr("Usermetric messages received today: %1")            emptyFormat: i18n.tr("No Usermetric messages received today.")            domain: applicationName        }        Column {            anchors.centerIn: parent            spacing: units.gu(2)            Button {                text: i18n.tr("Increase")                onClicked: {                    console.log("Going to increase the metric!");                    incomingMessagesMetric.increment()                }            }            Button {                text: i18n.tr("Decrease")                onClicked: {                    console.log("Going to increase the metric bye 2!");                    incomingMessagesMetric.increment(-2)                }            }            Button {                text: i18n.tr("Decrease")                onClicked: {                    console.log("Going to update to 3 to the metric!");                    incomingMessagesMetric.update(3)                }            }        }    }}

为了使用UserMetric，我们必须在我们的应用中使用usermetrics security policy:

usermetrics.apparmor

{    "policy_groups": [        "networking",        "webview",        "usermetrics"    ],    "policy_version": 1.3}

运行我们的应用：

每当我们点击increase按钮后，我们的欢迎界面数据将增加一个：

整个应用的源码在：https://github.com/liu-xiao-guo/usermetrics

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