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Fragment lifecycle8/27/2023 ![]() Supports both tablets and handsets by reusing fragments in different combinations, as illustrated inįor more information about designing your application with different fragment combinations forĭifferent screen configurations, see the guide to Supporting Tablets and Handsets. Only the fragment for the list of articles, and when the user selects an article, it startsĪctivity B, which includes the second fragment to read the article. Handset-sized screen, there's not enough room for both fragments, so Activity A includes Two fragments in Activity A, when running on a tablet-sized device. An example of how two UI modules defined byįragments can be combined into one activity for a tablet design, but separated for aįor example-to continue with the news application example-the application can embed More than one cannot fit within the same activity.įigure 1. ForĮxample, on a handset, it might be necessary to separate fragments to provide a single-pane UI when Layout configurations to optimize the user experience based on the available screen space. Your application to support both tablets and handsets, you can reuse your fragments in different This is especially important because a modularįragment allows you to change your fragment combinations for different screen sizes. Manipulating one fragment from another fragment. Include one fragment in multiple activities, so you should design for reuse and avoid directly That is, becauseĮach fragment defines its own layout and its own behavior with its own lifecycle callbacks, you can You should design each fragment as a modular and reusable activity component. Thus, instead of using one activity to select an article and anotherĪctivity to read the article, the user can select an article and read it all within the sameĪctivity, as illustrated in the tablet layout in figure 1. Left and another fragment to display an article on the right-both fragments appear in oneĪctivity, side by side, and each fragment has its own set of lifecycle callback methods and handle ![]() To modify the activity's appearance at runtime and preserve those changes in a back stackįor example, a news application can use one fragment to show a list of articles on the 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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