Debugging React Native apps on Android can be a bit of a pain. If you're trying to find the logging for the emulator or device (not just React logging) then there is a way:

  1. From Android Studio, create or open an Android project. It doesn't matter which project it is, but it must be an Android one to get the Android menu to be visible.
  2. From the Android Studio menu, choose Tools > Android > AVD.
Open AVD menu
  1. Create or start your emulator from the AVD dialogue.
  2. Go back to Android Studio; from the menu choose Tools > Android > Android Device Manager.
Open device manager
  1. Click on your device or emulator in the left-hand panel; your debugging will appear in the LogCat panel at the bottom of the screen.
Open logcat menu

Now run react-native run-android and check for the output!