By dividing the layout of an activity into fragments, you become able Fragments allow such designs without the need for you to manage complexĬhanges to the view hierarchy. Tablet's screen is much larger than that of a handset, there's more room to combine and How fragments can maintain their state when added to the activity's back stack, shareĮvents with the activity and other fragments in the activity, contribute to the activity's actionĪndroid introduced fragments in Android 3.0 (API level 11), primarily to support moreĭynamic and flexible UI designs on large screens, such as tablets. This document describes how to build your application to use fragments, including However, a fragment is not required to be a part of theĪctivity layout you may also use a fragment without its own UI as an invisible worker for the Layout file, as a element, or from your application code by adding it to anĮxisting ViewGroup. You can insert a fragment into your activity layout by declaring the fragment in the activity's When you add a fragment as a part of your activity layout, it lives in a ViewGroup inside the activity's view hierarchy and the fragment defines its own view The back stack allows the user to reverse a fragment transaction (navigate backwards),
When you perform such aįragment transaction, you can also add it to a back stack that's managed by theĪctivity-each back stack entry in the activity is a record of the fragment transaction that Manipulate each fragment independently, such as add or remove them. However, while anĪctivity is running (it is in the resumed lifecycle state), you can For example, when the activity is paused, so are allįragments in it, and when the activity is destroyed, so are all fragments.
Which you can add or remove while the activity is running (sort of like a "sub activity" thatĪ fragment must always be embedded in an activity and the fragment's lifecycle is directlyĪffected by the host activity's lifecycle. Modular section of an activity, which has its own lifecycle, receives its own input events, and
Multi-pane UI and reuse a fragment in multiple activities. You can combine multiple fragments in a single activity to build a Coordinating with the activity lifecycleĪ Fragment represents a behavior or a portion of user interface in anĪctivity.Creating event callbacks to the activity.Fragments require API Level 11 or greater.Fragments have their own lifecycle, state, and back stack.Add multiple fragments to a screen to avoid switching activities.Fragments decompose application functionality and UI into reusable modules.
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