I have the Sound Manager app . The app dates back to Android 2.2 and needs a hardware menu button press to launch its menu .
Can I emulate the hardware menu button on my KitKat 4.4 device , so that I can see the menu?
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Apps that could either customize the navigation bar or generate another way of navigation would get it done; however, I've yet to seen one emulating MENU key without requiring root permissions.
LMT Launcher is the app of this type I've been using - it hides a pie-shaped control tray into the edge(s) of your screen that you can activate by swiping from the edge, and contains not just regular navigation keys like BACK, HOME, MENU but also custom keypresses (e.g. POWER) and actions.
On my Samsung SM-J100H (Android KitKat 4.4.4), I can get the effect I want with a long press on the App Switch hardware button. I tested it in two apps:
On Sound Manager app, the menu slides out from the bottom of the screen.
On the Stack Exchange app, an 'Ask Question' button pops up across the bottom of the screen (but only in portrait orientation.)