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This is unlikely but it would potentially save me a lot of time to re-write the same code. I want to implement a UI using alert-type service (like Chathead) yet I'd still like to use my fragments. Is it possible? I know I can add views to the window but fragments?
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A fragment is not required to be a part of the Activity layout; you may also use a fragment without its own UI as an invisible worker for the Activity but it needs to be attached to an Activity in order to appear on the screen. Android app must have an Activity or FragmentActivity that handles the fragment.
To read more refer to Activity Lifecycle in Android with Demo App. Activity is an application component that gives a user interface where the user can interact. The fragment is only part of an activity, it basically contributes its UI to that activity. Fragment is dependent on activity.
A fragment represents a reusable portion of your app's UI. A fragment defines and manages its own layout, has its own lifecycle, and can handle its own input events. Fragments cannot live on their own--they must be hosted by an activity or another fragment.
However, a fragment is not required to be a part of the activity layout; you may also use a fragment without its own UI as an invisible worker for the activity. You can combine multiple fragments in a single activity to build a multi-pane UI. A modular fragment allows you to change your fragment combinations for different screen sizes.
Fragments are part of the activity, so they cannot replace activity. Though they behave like activity, they cannot stand themselves. Its like view cannot itself act like activity.
From Android Developers:
A Fragment represents a behavior or a portion of user interface in an Activity. You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities. You can think of a fragment as a modular section of an activity, which has its own lifecycle, receives its own input events, and which you can add or remove while the activity is running (sort of like a "sub activity" that you can reuse in different activities).
I hope it is helpful to you.
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