trailmop.blogg.se - Android studio fragment oncreateview

#ANDROID STUDIO FRAGMENT ONCREATEVIEW ANDROID#
#ANDROID STUDIO FRAGMENT ONCREATEVIEW CODE#
#ANDROID STUDIO FRAGMENT ONCREATEVIEW TV#

Typically you get in this method a reference to the activity which uses the fragment for further initialization work.

onAttach() : The fragment instance is associated with an activity instance.The fragment and the activity is not fully initialized.

#ANDROID STUDIO FRAGMENT ONCREATEVIEW ANDROID#

One activity for a tablet design but separated for a handset design.Īndroid fragments have their own life cycle very similar to an android activity. The below image shows how two UI modules defined by fragments can be combined into Use fragments also to support different layout for landscape and portrait orientation on Single-pane layouts for handsets (phones) and multi-pane layouts for tablets. Simplify the reuse of components in different layouts and their logic. Often we need to lookup or find a fragment instance within an activity layout file.A fragment encapsulates functionality so that it is easier to reuse within activitiesĪnd layouts.Android devices exists in a variety of screen sizes and densities. Refer to this detailed lifecycle chart to view the lifecycle of a fragment more visually. The Java controller for a fragment looks like: import public class FooFragment extends Fragment Think of them as a partial (re-usable) activity: The XML layout file is just like any other layout file, and can be named fragment_foo.xml. Usage Defining a FragmentĪ fragment, like an activity, has an XML layout file and a Java class that represents the Fragment controller. To reiterate, in a fragment-based architecture, the activities are for navigation and the fragments are for views and logic. Retrieval and storage of data from persistence through model objects.Triggering of network request through a client object.View state management logic such as visibility or error handling.Event handling logic associated with relevant views.Layouts and views displaying relevant app content.Receiving data from intents and passing data between fragments.įragments are content controllers and contain most views, layouts, and event logic including:.Hiding and showing relevant fragments using the fragment manager.Presenting navigational components such as the navigation drawer or the viewpager.Navigation to other activities through intents.Inside of an app which uses fragments extensively, we need to keep in mind that the role of an activity shifts.Īctivities are navigation controllers primarily responsible for:

#ANDROID STUDIO FRAGMENT ONCREATEVIEW CODE#

Within a fragment-heavy app, we need to remember to organize our code according to architectural best practices. Fragments enable both orientations to reuse shared elements while also having differences.

Screen Orientation - Often within apps, the portrait version of an activity has a substantially different layout from the landscape version.

Fragments enable device-specific activities to reuse shared elements while also having differences.

#ANDROID STUDIO FRAGMENT ONCREATEVIEW TV#

Tablet Support - Often within apps, the tablet version of an activity has a substantially different layout from the phone version which is different from the TV version.

For example, using the same list across different data sources within an app.

Reusing View and Logic Components - Fragments enable re-use of parts of your screen including views and event logic over and over in different ways across many disparate activities.

There are many use cases for fragments but the most common use cases include: Within a fragment-oriented architecture, activities become navigational containers that are primarily responsible for navigation to other activities, presenting fragments and passing data.

Fragments are standalone components that can contain views, events and logic.

Fragments encapsulate views and logic so that it is easier to reuse within activities.

Using the support library, fragments are supported back to all relevant Android versions.

A Fragment is a combination of an XML layout file and a java class much like an Activity.Here are the important things to understand about fragments: Fragments must be embedded in activities they cannot run independently of activities. A Fragment typically defines a part of a user interface. A fragment is a reusable class implementing a portion of an activity.