如何在Ubuntu平台上使用Bluetooth

截止到目前为止，在Ubuntu平台上，Bluetooth还没有被正式支持。对于一些hacker级的开发者来说，可能等不急。我们在这里提供一个方法让大家来尝尝鲜。最终的平台会支持Bluetooth。而且相应的库也将会安装到平台之中去。

为了能够在手机中运行Bluetooth的应用，我们必须做如下的动做：



上面的句子：

$ sudo mount -o rw,remount /

是为了让我们的image变为可读写的状态，以便我们在下面安装我们的Qt Bluetooth库

我们通过命令：

$ sudo apt-get install qml-module-qtbluetooth

来安装相应的Qt Bluetooth的库。

由于目前Bluetooth没有被完全支持，所以没有相应的security policy和它对应。在我们的测试应用中，我们必须适应“unconfined” template:

bluetooth.apparmor

{
"policy_groups": [
"networking",
"webview",
"connectivity"
],
"policy_version": 1.3,
"template": "unconfined"
}

Scanner.qml

import QtQuick 2.0
import QtBluetooth 5.2

Item {
id: top

property BluetoothService currentService

BluetoothDiscoveryModel {
id: btModel
running: true
discoveryMode: BluetoothDiscoveryModel.DeviceDiscovery
onDiscoveryModeChanged: console.log("Discovery mode: " + discoveryMode)
onServiceDiscovered: console.log("Found new service " + service.deviceAddress + " " + service.deviceName + " " + service.serviceName);
onDeviceDiscovered: console.log("New device: " + device)
onErrorChanged: {
switch (btModel.error) {
case BluetoothDiscoveryModel.PoweredOffError:
console.log("Error: Bluetooth device not turned on"); break;
case BluetoothDiscoveryModel.InputOutputError:
console.log("Error: Bluetooth I/O Error"); break;
case BluetoothDiscoveryModel.InvalidBluetoothAdapterError:
console.log("Error: Invalid Bluetooth Adapter Error"); break;
case BluetoothDiscoveryModel.NoError:
break;
default:
console.log("Error: Unknown Error"); break;
}
}
}

Rectangle {
id: busy

width: top.width * 0.7;
anchors.horizontalCenter: parent.horizontalCenter
anchors.top: top.top;
height: text.height*1.2;
radius: 5
color: "#1c56f3"
visible: btModel.running

Text {
id: text
text: "Scanning"
font.bold: true
font.pointSize: 20
anchors.centerIn: parent
}

SequentialAnimation on color {
id: busyThrobber
ColorAnimation { easing.type: Easing.InOutSine; from: "#1c56f3"; to: "white"; duration: 1000; }
ColorAnimation { easing.type: Easing.InOutSine; to: "#1c56f3"; from: "white"; duration: 1000 }
loops: Animation.Infinite
}
}

ListView {
id: mainList
width: top.width
anchors.top: busy.bottom
anchors.bottom: buttonGroup.top
anchors.bottomMargin: 10
anchors.topMargin: 10
clip: true

model: btModel
delegate: Rectangle {
id: btDelegate
width: parent.width
height: column.height + 10

property bool expended: false;
clip: true
Image {
id: bticon
source: "images/default.png";
width: bttext.height;
height: bttext.height;
anchors.top: parent.top
anchors.left: parent.left
anchors.margins: 5
}

Column {
id: column
anchors.left: bticon.right
anchors.leftMargin: 5
Text {
id: bttext
text: deviceName ? deviceName : name
font.family: "FreeSerif"
font.pointSize: 16
}

Text {
id: details
function get_details(s) {
if (btModel.discoveryMode == BluetoothDiscoveryModel.DeviceDiscovery) {
//We are doing a device discovery
var str = "Address: " + remoteAddress;
return str;
} else {
var str = "Address: " + s.deviceAddress;
if (s.serviceName) { str += "<br>Service: " + s.serviceName; }
if (s.serviceDescription) { str += "<br>Description: " + s.serviceDescription; }
if (s.serviceProtocol) { str += "<br>Protocol: " + s.serviceProtocol; }
return str;
}
}
visible: opacity !== 0
opacity: btDelegate.expended ? 1 : 0.0
text: get_details(service)
font.family: "FreeSerif"
font.pointSize: 14
Behavior on opacity {
NumberAnimation { duration: 200}
}
}
}
Behavior on height { NumberAnimation { duration: 200} }

MouseArea {
anchors.fill: parent
onClicked: btDelegate.expended = !btDelegate.expended
}
}
focus: true
}

Row {
id: buttonGroup
property var activeButton: devButton

anchors.bottom: parent.bottom
anchors.horizontalCenter: parent.horizontalCenter
anchors.bottomMargin: 5
spacing: 10

Button {
id: fdButton
width: top.width/3*0.9
//mdButton has longest text
height: mdButton.height
text: "Full Discovery"
onClicked: btModel.discoveryMode = BluetoothDiscoveryModel.FullServiceDiscovery
}
Button {
id: mdButton
width: top.width/3*0.9
text: "Minimal Discovery"
onClicked: btModel.discoveryMode = BluetoothDiscoveryModel.MinimalServiceDiscovery
}
Button {
id: devButton
width: top.width/3*0.9
//mdButton has longest text
height: mdButton.height
text: "Device Discovery"
onClicked: btModel.discoveryMode = BluetoothDiscoveryModel.DeviceDiscovery
}
}

}

关于BluetoothDiscoveryModel的介绍，开发者可以直接参阅Qt文档做更一步的认识。

运行我们的应用：





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