Detecting Android's native browser with JavaScript

Like usual I googled this and figured I would have a nice and simple copy and paste for my project. To my dismay there was nothing of the sort... The answers I did find did not alienate just the android browser but the whole device.

Most answers look something like this:

nua = navigator.userAgent;
var isAndroid = ((nua.indexOf('Mozilla/5.0') > -1 && nua.indexOf('Android ') > -1 && nua.indexOf('AppleWebKit') > -1) && !(nua.indexOf('Chrome') > -1));
if(isAndroid) {

The issue was that not only does this test true for the Native Android Browser but also Google Chrome on Android.

I used http://www.whatsmyua.info on each browser to find out what the user agent was returning.

This is what comes up on Android Native on my Galaxy S4:

Ua: Mozilla/5.0 (Linux; Android 4.2.2; en-us; SAMSUNG SCH-I545 Build/JDQ39) AppleWebKit/535.19 (KHTML, like Gecko) 
Version/1.0 Chrome/18.0.1025.308 Mobile Safari/535.19
string: Chrome Mobile 18.0.1025
family: Chrome Mobile
major: 18
minor:
patch: 1025
device: SAMSUNG SCH-I545

And Google Chrome:

rawUa: Mozilla/5.0 (Linux; Android 4.2.2; SCH-I545 Build/JDQ39) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.166 Mobile Safari/537.36
string: Chrome Mobile 33.0.1750
family: Chrome Mobile
major: 33
minor:
patch: 1750
device: SCH-I545

So looking at this I notice that they are both coming up as "Chrome Mobile". There's my problem...

I decided to go ahead and single out the stock Android Browser by version number. Notice for the Stock browser it is major: 18 and Chrome is major: 33. So the psuedo code is - looking for a mobile Chrome browser with a version below 19.

This method is probably considered bad practice but I had to make it happen!!

I didn't do very much research but I'm willing to bet that most Chrome Mobile browsers are running higher than version 18...

Anyways - hopefully this will be a fun copy and paste for the next person looking for the same code that I was ;)