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I already solved the problem... it was problem of configuration of hosts on emulator
To solve the problem follow these steps...
With the emulator arleady opened, run:
cd adt-bundle/sdk/platform-tools/
./adb -s emulator-5554 remount
To remount the filesystem so its not read only and you’ll be able to change the hosts file.
Then run:
./adb -s emulator-5554 pull /etc/hosts
This gets the current hosts file from the device. Edit it in whatever text editor, it’s been pulled to the current working dir. I used gedit. gedit hosts
and add the following line
10.0.2.2 machineName
in my case
10.0.2.2 rocha
Finally run:
./adb -s emulator-5554 push hosts /etc/hosts