Add RTCBrowserType.isAndroid().

modules/RTC/RTCBrowserType.js

 
 var browserVersion;
 
+var isAndroid;
+
 var RTCBrowserType = {
 
     RTC_BROWSER_CHROME: "rtc_browser.chrome",
 
     usesUnifiedPlan: function() {
         return RTCBrowserType.isFirefox();
+    },
+
+    /**
+     * Whether the browser is running on an android device.
+     */
+    isAndroid: function() {
+        return isAndroid;
     }
 
     // Add version getters for other browsers when needed
 }
 
 browserVersion = detectBrowser();
+isAndroid = navigator.userAgent.indexOf('Android') != -1;
 
 module.exports = RTCBrowserType;

modules/RTC/RTCUtils.js

     return resName;
 }
 
-function setResolutionConstraints(constraints, resolution, isAndroid) {
+function setResolutionConstraints(constraints, resolution) {
+    var isAndroid = RTCBrowserType.isAndroid();
 
     if (Resolutions[resolution]) {
         constraints.video.mandatory.minWidth = Resolutions[resolution].width;
             constraints.video.mandatory.minHeight;
 }
 
-function getConstraints(um, resolution, bandwidth, fps, desktopStream, isAndroid)
-{
+function getConstraints(um, resolution, bandwidth, fps, desktopStream) {
     var constraints = {audio: false, video: false};
 
     if (um.indexOf('video') >= 0) {
 
         constraints.video.optional.push({ googLeakyBucket: true });
 
-        setResolutionConstraints(constraints, resolution, isAndroid);
+        setResolutionConstraints(constraints, resolution);
     }
     if (um.indexOf('audio') >= 0) {
         if (!RTCBrowserType.isFirefox()) {
         };
         // DTLS should now be enabled by default but..
         this.pc_constraints = {'optional': [{'DtlsSrtpKeyAgreement': 'true'}]};
-        if (navigator.userAgent.indexOf('Android') != -1) {
+        if (RTCBrowserType.isAndroid()) {
             this.pc_constraints = {}; // disable DTLS on Android
         }
         if (!webkitMediaStream.prototype.getVideoTracks) {
     um, success_callback, failure_callback, resolution,bandwidth, fps,
     desktopStream) {
     currentResolution = resolution;
-    // Check if we are running on Android device
-    var isAndroid = navigator.userAgent.indexOf('Android') != -1;
 
     var constraints = getConstraints(
-        um, resolution, bandwidth, fps, desktopStream, isAndroid);
+        um, resolution, bandwidth, fps, desktopStream);
 
     console.info("Get media constraints", constraints);