The cool thing about the landscape mode is that the two fragments are treated independently. That's because in the portrait only mode only a single fragment at time can be viewed at a time, as shown below. In portrait mode the screen renders a fragment for the titles and when one is selected it renders the details the screen - in this case the title fragment is no longer visible, only the details (i.e., play's text) is in focus.

The Fragment app is adaptive to these two events: different device form factors and orientation. The cool thing about the app is that it is responsive to real world events: for example, different form factor devices have the ability to lay out fragments differently and the user might flip the orientation of the phone - say from portrait to landscape to portrait. The user can tap on one of these titles and get a snippet of the play's text. The goal of the app is simple: it presents the user with a list of titles of some of Shakespeare's plays (BTW, I was born 17 miles from the Bard's Stratford-Upon-Avon home, but in a different century) as a list view. The Fragment app uses fragments in a number of different ways we have not seen before. Course book section on The Tactics of Fragments.This code is part of the sample code is available from the Android SDK Manager as part of the ApiDemos project. The fragment manager and fragment transactions allow us to dynamically change the UI. It includes two fragments that can be renders only one at at time in portrait mode, but in landscape more both fragments are shown side by side which is cool. Download the fragments.zip app that go with these notes.FragmentManager and Fragment Transactions.

Managing state between orientation flips.How does Android know which fragment_layout.xml to use?.Landscape mode processing: The tale of one activity and two fragments.

Portrait mode processing: The tale of two activities and two fragments.In this lecture, we will use the case study of the Fragment App to best understand how code can build dynamic layouts and respond to these types of events. The FragmentManager is responsible for adding, replacing, removing fragments dynamically. In portrait mode an app may show itself in a different manner to say landscape. Dynamic Layouts using the Fragment Managerįragments can be used to respond to user input, varying form factors (phone or tablet) and other issues, such as, the orientation of the device.

Android studio fragment not show