Tune-in to next radio station on FM radio without unlocking the phone I'm using Moto E 1st gen. on Android KitKat. I'm used to listening to FM radio while travelling, but whenever I want to tune-in to other radio station, I have to unlock the phone first because I'm using a pattern lock. I'm also using headset, but there's no control buttons, so I can't change the radio station with it.

Since it's difficult to unlock while travelling (moving) and sometimes takes too many attempts, is it possible to tune-in to next radio station without unlocking? Perhaps a widget on the lock-screen?
Have you tired to double press the button in your headset? The stock radio player app should do it. And in case if does not there are plenty of apps (Headset Control Center to name one) in market that can recognise the double press and do a task for you, which could be change the radio station.

Update:
After realizing the absence of headset button through the OP's comment, I suggest to use Tasker and Intent Radio app.  The concept is that the Tasker can be used to identify a trigger. This could be head set plug in, head set removed, power button pressed, volume buttom pressed, movement gesture - few listed out of many options.  This trigger will raise an intent to the Intent Radio which can change the radio station.