React native debug menu does not work in Android.
Command 'RR' does work. CMD + M does not work.
It was working previously. Keyboard input is enabled in AVD Manager.
There is an obscure setting only available after opening the emulator.
Toggle Send keyboard shortcuts to: Emulator Controls (default)
I have no idea why this was so hard to find. Hopefully you reap the benefits of my stress and heartache.
I wish you the best Christmas in 2017 and that 2018 is great for you.
来源：https://stackoverflow.com/questions/47321228/react-native-debug-menu-does-not-open-android-cmd-m