如何在Ubuntu手機中監測網路的串連資訊

標籤：

我們知道對於很多的網路應用來說，網路的串連資訊對於我們來說非常重要。我們有必要對網路的串連資訊進行監測。一旦網路串連斷開，我們需要提醒使用者或做一些處理。在Ubuntu平台上，我們可以使用connectivity庫來查看。

我們可以利用SDK的模版來建立一個最簡單的QML應用。因為我們要使用connectivity，所以我們必須加入“connectivity”的security policy。

在我們的開發人員網站上雖然也有NetworkStatus的介紹，但是可能並不是很全，我們可以使用如下的命令來得到更多的資訊：

$qmlplugindump Ubuntu.Connectivity 1.0

顯示的結果如下：

import 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 Ubuntu.Connectivity 1.0'Module {    Component {        name: "NetworkingStatus"        prototype: "ubuntu::connectivity::NetworkingStatus"        exports: ["NetworkingStatus 1.0"]        isCreatable: false        isSingleton: true        exportMetaObjectRevisions: [0]        Property { name: "online"; type: "bool"; isReadonly: true }        Property { name: "limitedBandwith"; type: "bool"; isReadonly: true }        Signal {            name: "onlineChanged"            Parameter { name: "value"; type: "bool" }        }        Signal {            name: "limitedBandwithChanged"            Parameter { name: "value"; type: "bool" }        }    }    Component {        name: "ubuntu::connectivity::NetworkingStatus"        prototype: "QObject"        Enum {            name: "Limitations"            values: {                "Bandwith": 0            }        }        Enum {            name: "Status"            values: {                "Offline": 0,                "Connecting": 1,                "Online": 2            }        }        Property { name: "limitations"; type: "QVector<Limitations>"; isReadonly: true }        Property { name: "status"; type: "Status"; isReadonly: true }        Signal {            name: "statusChanged"            Parameter { name: "value"; type: "Status" }        }    }}

這裡我們可以看到有一個叫做“status”的屬性。我們可以通過監測這個屬性的變化而得到網路的串連狀態的變化。我們的main.qml的檔案如下：

import QtQuick 2.0import Ubuntu.Components 1.1import Ubuntu.Connectivity 1.0/*!    \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: "networkstatus.ubuntu"    /*     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(50)    height: units.gu(75)    property real margins: units.gu(2)    property real buttonWidth: units.gu(9)    Connections {        target: NetworkingStatus        // full status can be retrieved from the base C++ class        // status property        onStatusChanged: {            console.log("name: " + value );            if (value === NetworkingStatus.Offline)                console.log("Status: Offline")            if (value === NetworkingStatus.Connecting)                console.log("Status: Connecting")            if (value === NetworkingStatus.Online)                console.log("Status: Online")        }    }    Page {        title: i18n.tr("Networking Status")        Column {            anchors.centerIn: parent            Label {                // use the online property                text: NetworkingStatus.online ? "Online" : "Not online"                fontSize: "large"            }            Label {                // use the limitedBandwith property                text: NetworkingStatus.limitedBandwith ? "Bandwith limited" : "Bandwith not limited"                fontSize: "large"            }        }    }}

最終運行我們的應用，我們可以看到在wifi斷開和串連上時的狀態變化：

  

測試代碼在：　git clone https://gitcafe.com/ubuntu/networkstatus.git

如何在Ubuntu手機中監測網路的串連資訊