4/2/2023 0 Comments Fragment example![]() It is called when the UI first initializes and later when the fragment returns back from the back stack. ![]() The system invokes this method when we need to create the user interface of the fragment. This is an important phase of implementation and all the attributes and components need to be added in this method itself. This method executes only once during the whole implementation that is when the fragment attaches to an Activity. Our fragment class needs to implement the following methods for the fragments to work properly. ![]() The lifecycle of Android fragments strongly depends on the activity lifecycle and is similar to it. When we select an item from Fragment A, it gets open in the Fragment B of Activity 2. In the case of mobiles, there are two activities that are:Īctivity 1 with Fragment A and Activity 2 with Fragment B. When we select an item from Fragment A, it gets open in Fragment B of the same activity. In Activity 1, there are two fragments, Fragment A and Fragment B. In tablets, there is only one activity that is Activity 1. Come we’ll understand both their functions: The above image depicts two devices a Handset and a Tablet. How Fragment Interacts with Activity in Different Devices It supports switching between two fragments. Fragment Transactionsįragment transactions are for the transition from one fragment to another. In this, there’s a list and the user can choose to see a Sub-Activity. List fragments are those that have a special list view feature. These are for handheld devices such as mobile phones. Single fragments show only a single view for the user on the screen. To understand how a fragment interacts with the Activity, consider the following: It can make different types of tab displays like scrolling, fixed or swiping tab. All the Fragments contain their own Events.įragments generally provide us with a more flexible and wide range of options to make our Application more interactive. Fragments improve the adaptability & user experience by making the UI flexible for all devices. Another name for Fragment can be Sub-Activity as they are part of Activities.įragments can be dynamically added and removed as per the requirements. Android Fragments cannot exist outside an activity. It represents a portion of UI that the user sees on the screen. It resides within the Activities of an Android application. What is Android Fragment?Īndroid Fragment is a Graphical User Interface component of Android. Let’s start with a basic understanding of fragments. In addition to this, we will also understand the process of adding fragments to activities, communication between fragment and activity and adding fragments within a fragment. In this tutorial, we will learn about the working of Android fragment, its types, lifecycle, methods, and an example. Moving further in our series of Android tutorials, now, it’s the turn for Android fragment. You can compare it to the version in Figure 5–2.We offer you a brighter future with FREE online courses Start Now!! ![]() The screen produced by tut-install/javaeetutorial5/examples/web/bookstore3/web/bookcatalog.jsp is shown in Figure 8–2. Invoked by the tag according to data retrieved from the book database. The formatting of the book price is determined by two fragment attributes, normalPrice and onSale, that are conditionally That has the simple attributes bookDB, which contains catalogĭata, and color, which customizes the coloring of the table The page bookcatalog.jsp invokes the catalog tag Before the tag invokes the fragment attributes using the jsp:invoke element, the web container passes values for the variables back The fragment normalPrice uses the variable price, and the fragment onSale uses the variables price and salePrice. The tag fileĭeclares that it sets variables named price and salePrice using variable directives. The tag renders the catalog of a book database as an HTML table. Simple and Fragment Attribute and Variable Exampleĭuke’s Bookstore catalog tag, defined in tut-install/javaeetutorial5/examples/web/bookstore3/web/WEB-INF/tags/catalog.tag, is a custom tag with simple and fragment attributes and variables. ![]()
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