Android application restarts on orientation change

Question

When I change orientation application restarts and I lost my current data.. I am using activity group which contain lots of activities when i change orientation application

Answer 1

if your android:targetSdkVersion="12" or less

android:configChanges="orientation|keyboardHidden">

if your android:targetSdkVersion="13" or more

android:configChanges="orientation|keyboardHidden|screenSize">