Using onX to program my android phone in javascript

A very useful little app : as it allows 'rules' on your android phone with a near-complete access to the smartphone functionality from JS.

https://www.onx.ms

What is it good for? in my case, starting the music player at full volume when I plug in the headset cable in the car! 

Otherwise, I had to unlock the phone, select the music player, put the volume up to max (as otherwise its inaudible due to the 3.5mm jack hookup I use in my Touran), and press play... all while driving off..

Now, I just plug in the jack and it all happens automatically...