What is a Fragment, in android?
i. Fragments are designed to use the device UI space efficiently.
ii. Fragments are designed as a reusable components for multiple activities.
iii. Fragment will have its own life cycle, which will not dependent on Activity's life cycle.
iv. Fragment will have its own life cycle, which will be affected by Activity's life cycle as well.
i & ii
i, ii, & iii
i, ii, & iv
Fragments is a new concept introduced in 3.0 version.
The basic purpose of fragments is:
1. Fragments are designed to use the device UI space efficiently.
When you are writing an application in android, then some people can download it into phone, some into tablets. If you see the space in tablets it will be little bigger than phones. You should be able to use that space efficiently. But you can't keep writing different applications one targeting for phone, and other targeting for tablets. In order to do it efficiently, i.e writing only application that can fit well with all screen sizes, we use fragments concept.
2. fragments are designed as a reusable UI components between more than one activity.
Once you design a fragment, you can view it as a detachable independent unit, so that you can plug it into any activity where ever there is a space. That means you can reuse the code designed for a fragment.
Fragment you can think of it like a sub activity, which sits with in an activity and which contributes its own UI to the activity screen.
Fragments are always part of an activity. With out an activity, a fragment will not exist. So your fragment life cycle will always be affected by activity life cycle.
An activity can contain more than one fragment. Similarly a fragment can be re used in multiple activities.
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