Android studio fragment oncreateview
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However, onCreateView() is called first and should only be used to inflate the fragment's view.
![android studio fragment oncreateview android studio fragment oncreateview](https://i.stack.imgur.com/wVkEW.jpg)
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#ANDROID STUDIO FRAGMENT ONCREATEVIEW ANDROID#
It is in this state that the Android system begins creating the fragment's view. Once onAttch() is called the fragment enters the CREATED state. Once the fragment has been added to the Fragment Manager, onAttach() is called to attach the fragment to the host activity. Difference between onCreateView() and onViewCreated() The fragmentlayout. The system inserts the view returned by the fragment directly in place of the element in the XML below. The Fragment Manager is responsible for determining what state its fragment should be in and then moving them into that state. When the system creates this activity layout, it instantiates each fragment specified in the layout and calls the onCreateView () method for each one, to retrieve each fragments layout. class syntax is the class literal syntax and for a brief summary I would recommend reading the blog post HEREįor a fragment to transition into other lifecycle states, it must be added to a Fragment Manager. You can then create instances of this fragment in the parent activity whenever you need a new page to display to the user: Kotlin Java.
![android studio fragment oncreateview android studio fragment oncreateview](https://www.edumobile.org/wp-content/uploads/2012/05/fragmentexample3.png)
So when a fragment is instantiated, it begins in the INITIALIZED state, for example when you see:ĬustomFragment frag1 = new CustomFragment() //`INITIALIZED` stateĬustomFragment.class //`INITIALIZED` state Create a Fragment class that returns the layout that you just created in the onCreateView () method. The reason that we need to talk about the fragment lifecycle is because both onCreateView() and onViewCreated() get called during the CREATED state in the lifecycle. The fragment lifecycle contains 5 states:
#ANDROID STUDIO FRAGMENT ONCREATEVIEW FULL#
The full documentation about the fragment lifecycle can be found HERE, I recommend that you read up on it, as we will only be talking about the states relevant to onCreateView() and onViewCreated(). It is worth while to talk a little about the fragment lifecycle. Open src//FragmentOne.java and paste the following.įragmentOne.java: package, so If we are going to talk about onCreateView() and onViewCreated(). We will name it FragmentOne and we will put it in the same package as the MainActivity.java file. In terms of fragments life cycle events onPause, onResume, onCreateView and other life cycle events will be invoked in case of replace but they wont be invoked in case of add. To the opened window, specify the name for the new Class. We are going to make two different classes to define the fragments, that extends the Fragment Class. The android:name defines an object of a Fragment Class, that we want to be instantiated and the android:id specifies the unique id of that fragment. When we add a element in a layout, we have to contain the android:name and android:id attributes. Open res/layout/activity_main.xml and go to the “activity_main.xml” tab. So we will create two different buttons within the main LinearLayout and a fragment by using the tag. When a button is pressed, a fragment appears below them. Create the layout of the Main Activityįor this example, we need two different Buttons. In the image below you can see the final structure of the created project.Ģ. xml file for the layout will automatically be created in the res/layout folder. Specify a name for the new Activity and a name for the layout description of your app. In the next window, select the “Blank Activity” option and press Next.