Disconnect network in Android emulator while keeping ADB alive

Question

I have made a mistake somewhere in my code that my Android app crashes when I switch off the network in the emulator while the app's HTTPClient is making some request.

But I cannot debug it, because when I switched off the network, I also lost the ADB connection. Thus I cannot see what exception is causing the crash.

I have tried switching off the network by:

• F8
• Set 'Data' to 'Unregistered' or 'Denied' in DDMS Emulator Control

I can put my Mac offline and ADB will stay up, but unfortunately I cannot reproduce the crash that way.

Is there a way to turn off network in the emulator, while keeping ADB alive? I basically need access to the LogCat entries.

Thanks!

Answer 1

You can run logcat from the device instead of from ADB and redirect it to a file for offline reading.

adb shell logcat [-v threadtime] > /sdcard/mylogs/logcat.log

Instead of

adb logcat [-v threadtime]

Then you can get the file when you reconnect to the device.

Answer 2

On linux this is pretty simple with iptables firewall. I suppose you trying to debug api calls so just block api host:

iptables -I OUTPUT -d api.example.com -j DROP

Sure you can do the same thing with Mac or Windows firewall.