In android, we preserve the instance state of our activities by using onSaveInstanceState(Bundle outState)
.
Now in order to properly implement this it is necessary to have a unique string key for all variables stored inside outState
.
I am curious of how unique I need to make this string.
1) Is the Bundle
propagated via the Android OS to all active Activities - therefore all keys must be Application & activity namespaced ?
(eg com.twitter.www.mobile.LOGIN_ACTIVITY.is_logged_in
)
2) Is the Bundle
only accessed by the Activity in which it was called- therefore all keys must only be Application namespaced ?
(eg com.twitter.www.mobile.is_logged_in
)
The bundle in a particular Fragment
or Activity
is unique only that Fragment
or Activity
. They are not propagated throughout the application. It's always good to be verbose/specific in your keys and variables to avoid confusion but you do not have to worry about accessing the wrong instance state bundle or key-value pair from a different activity or fragment.
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