I have Retroarch installed on my Nexus 4 and I am using a Moga Hero gamepad as my input device. Retroarch does a good job automatically detecting the gamepad and configuring the buttons, however, I cant find a way to access the RGUI to access the save and load state options. I went into setting>input and selected “back button behavior”, but it doesn’t do anything. If I click the back button on my phone a graphic appears saying something to the extent of “port 0…”, but it doesn’t access the RGUI. If I click on the gamepad after, a message saying something to the extent of “port 1…” appears. I cant seem to find out where to go from here. Please help. Should I manually edit the button mapping, or it this just a flaw that I will need to wait to be resolved? Thanks.
If you’re using a gamepad, I recommend using the ‘immerse’ overlay, which shows nothing by default, but when you tap on the screen, it will bring up some function-related buttons, including one to enter RGUI. It’s really handy for staying out of the way until you need it 
Thank you! You just jogged my memory…I remember now that on my Nexus 7 I used a similar overlay to access the RGUI…this should work for me, thanks. I will report back once I get a chance to test it out (controller is at home).