Making a Call Using Bluetooth Device in Windows Store Apps

Introduction

In this article I describe how to create a Windows Store App for making a call by Bluetooth device using JavaScript. To use this app, ensure you have a Bluetooth device and press the Initialize Call Control button. After initialization you will be able to simulate an incoming call by pressing the Indicate Phone Call button. Use your Bluetooth device to answer and hang up the call. Redial and dial should work after initialization. Some devices require a stream to be opened so a file will start playing to the default communications device.

I assume you can create a simple Windows Store App using JavaScript. For more help visit Simple Windows Store Apps using JavaScript.

To start the creation of the app, add two JavaScript pages by right-clicking on the js folder in the Solution Explorer and select Add > new item > JavaScript Page and then give an appropriate name. In the same way, add one HTML page to your project.

Write the following code in default.html:

<!DOCTYPE html>

<html>

<head>

</head>

</div>

</center>

</body>

</html>

Write the following code in default.js:

(function () {

"use strict";

var appTitle = "";

var pages = [

{ url: "page.html" }

];

function activated(eventObject) {

if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) {

eventObject.setPromise(WinJS.UI.processAll().then(function () {

var url = WinJS.Application.sessionState.lastUrl || pages[0].url;

return WinJS.Navigation.navigate(url);

}));

}

WinJS.Navigation.addEventListener("navigated", function (eventObject) {

var url = eventObject.detail.location;

var host = document.getElementById("contentHost");

host.winControl && host.winControl.unload && host.winControl.unload();

WinJS.Utilities.empty(host);

eventObject.detail.setPromise(WinJS.UI.Pages.render(url, host, eventObject.detail.state).then(function () {

WinJS.Application.sessionState.lastUrl = url;

}));

});

WinJS.Namespace.define("App", {

appTitle: appTitle,

pages: pages

});

WinJS.Application.addEventListener("activated", activated, false);

WinJS.Application.start();

})();

Write the following code in page.html:

<!DOCTYPE html>

<head>

</head>

<body>

<button class="action" id="buttonInitialize">Initialize Call Buttons</button>

<button class="action secondary" id="buttonIncomingCall" disabled="disabled">Indicate Phone Call</button>

<br />

</div>

</div>

</audio>

</div>

</body>

</html>

Write the following code in script.js:

(function () {

"use strict";

var page = WinJS.UI.Pages.define("page.html", {

ready: function (element, options) {

document.getElementById("buttonInitialize").addEventListener("click", initDevice, false);

document.getElementById("buttonIncomingCall").addEventListener("click", newIncomingCall, false);

document.getElementById("buttonHangUp").addEventListener("click", hangupButton, false);

}

});

var callControls = null;

var callToken;

var audiotag;

function displayStatus(message) {

WinJS.log && WinJS.log(getTimeStampedMessage(message), "Call Control", "status");

}

function displayError(message) {

WinJS.log && WinJS.log(getTimeStampedMessage(message), "Call Control", "error");

}

function id(elementId) {

return document.getElementById(elementId);

}

function initDevice() {

if (!callControls) {

callControls = Windows.Media.Devices.CallControl.getDefault();

if (callControls) {

callControls.addEventListener("answerrequested", answerButton, false);

callControls.addEventListener("hanguprequested", hangupButton, false);

callControls.addEventListener("audiotransferrequested", audiotransferButton, false);

callControls.addEventListener("redialrequested", redialButton, false);

callControls.addEventListener("dialrequested", dialButton, false);

displayStatus("Call Controls Initialized");

id("buttonIncomingCall").disabled = false;

id("buttonHangUp").disabled = true;

id("buttonInitialize").disabled = true;

} else {

displayError("No Bluetooth device detected.");

}

function newIncomingCall() {

callToken = callControls.indicateNewIncomingCall(true, "5555555555");

displayStatus("Call Token: " + callToken);

id("buttonIncomingCall").disabled = true;

}

function answerButton() {

displayStatus("Answer requested: " + callToken);

callControls.indicateActiveCall(callToken);

audiotag = document.getElementById("audiotag");

audiotag.play();

id("buttonHangUp").disabled = false;

}

function hangupButton() {

displayStatus("Hangup requested");

callControls.endCall(callToken);

audiotag = document.getElementById("audiotag");

audiotag.pause();

id("buttonIncomingCall").disabled = false;

id("buttonHangUp").disabled = true;

callToken = 0;

}

function audiotransferButton() {

displayStatus("Audio Transfer requested");

}

function redialButton(redialRequestedEventArgs) {

displayStatus("Redial requested");

redialRequestedEventArgs.handled();

}

function dialButton(dialRequestedEventArgs) {

if (typeof (dialRequestedEventArgs.contact) === "number") {

displayStatus("Dial requested: " + dialRequestedEventArgs.contact);

dialRequestedEventArgs.handled();

}

else {

displayStatus("Dial requested: " + dialRequestedEventArgs.contact.schemeName + ":" +

dialRequestedEventArgs.contact.path);

dialRequestedEventArgs.handled();

}

function getTimeStampedMessage(eventCalled) {

var timeformat = new Windows.Globalization.DateTimeFormatting.DateTimeFormatter("longtime");

var time = timeformat.format(new Date());

var message = eventCalled + "\t\t" + time;

return message;

}

})();

Write the following code in script1.js:

(function () {

var pageOutput = WinJS.Class.define(

function (element, options) {

element.winControl = this;

this.element = element;

new WinJS.Utilities.QueryCollection(element)

.setAttribute("role", "region")

.setAttribute("aria-labelledby", "outputLabel")

.setAttribute("aria-live", "assertive");

element.id = "output";

this._addOutputLabel(element);

this._addStatusOutput(element);

}, {

_addOutputLabel: function (element) {

var label = document.createElement("h2");

label.id = "outputLabel";

label.textContent = "Output";

element.parentNode.insertBefore(label, element);

_addStatusOutput: function (element) {

var statusDiv = document.createElement("div");

statusDiv.id = "statusMessage";

element.insertBefore(statusDiv, element.childNodes[0]);

}

);

var currentpageUrl = null;

WinJS.Navigation.addEventListener("navigating", function (evt) {

currentpageUrl = evt.detail.location;

});

WinJS.log = function (message, tag, type) {

var statusDiv = document.getElementById("statusMessage");

};

function activated(e) {

WinJS.Utilities.query("#featureLabel")[0].textContent = App.appTitle;

}

WinJS.Application.addEventListener("activated", activated, false);

WinJS.Namespace.define("App", {

pageOutput: pageOutput

});

})();

Output:

Summary

In this app I described how to make and control a call by bluetooth device in a Windows Store App using JavaScript. I hope this article has helped you to understand this topic. Please share if you know more about this. Your feedback and constructive contributions are welcome.