If your Android emulator can't resolve domains or loses internet connection, try this:

# Open this file:
code ~/.android/avd/<your_avd_name>.avd/user-settings.ini
# or
code ~/.config/.android/avd/<your_avd_name>.avd/user-settings.ini

# Add this line:
commandLineOptions=-dns-server 8.8.8.8

Then restart the emulator (preferably with a cold boot).

This forces the AVD to use Google’s DNS, works like a charm when local DNS is messy.

Originally found this tip on Stack Overflow while troubleshooting DNS issues in the Android emulator.