Finally got it.
- Choose
File > Settings > Code Style > XML > Set from > Predefined Style > Android - Set
File > Settings > Editor > Formatting > Show "Reformat Code" dialog - Run formatting on a XML file (
CTRL+ALT+Lby default) - You will see a popup window, set the
Rearrange entriesflag - Disable
Reformat Codedialog in the settings
This way every XML file formatting will set the attributes in a proper order.
Edit:
Starting with Android Studio 0.2.6 release the XML Android style formatting is set by default, but you still have to set the Rearrange Entries flag manually.
http://tools.android.com/recent/androidstudio026released
Automatically apply the Android XML code style if a code style hasn’t
already been customized. This will make it possible to automatically
order XML attributes (check the “Rearrange Entries” checkbox in the
“Code > Reformat Code…” dialog.)