How do I get root view of activity?

anyview. getRootView(); will be the easiest way. Show activity on this post. in any onClick we will be getting “View view”, by using ‘view’ get the rootView.

What is findViewById () method used for?

findViewById is the method that finds the View by the ID it is given. So findViewById(R. id. myName) finds the View with name ‘myName’.

How do you write a view by ID?

With this you can call findViewById() . @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { ImageView imageView = (ImageView) getView(). findViewById(R. id.

What is the use of findViewById in Android with example?

Overloads

FindViewById(Int32)	Finds a view that was identified by the android:id XML attribute that was processed in #onCreate .
FindViewById(Int32)	Finds a view that was identified by the id attribute from the XML layout resource.

What parameters are passed to findViewById function?

findViewById(int id) The easiest way to find element of the Android app layout is to use its ID. We could add our own IDs to almost every XML tags. To add ID we use android:id attribute. We have to set in brackets a type of View we’re looking for and then give type and name of resources: (view_type) findViewById(R.

What are Viewgroups in Android?

ViewGroup is a collection of Views(TextView, EditText, ListView, etc..), somewhat like a container. A View object is a component of the user interface (UI) like a button or a text box, and it’s also called a widget.

What does findViewById return?

findViewById returns an instance of View , which is then cast to the target class. All good so far. To setup the view, findViewById constructs an AttributeSet from the parameters in the associated XML declaration which it passes to the constructor of View . We then cast the View instance to Button .

What is the return type of findViewById?

FindViewById returns View which is super class of all ui elements therefore u need to cast it to specific type.

What is the return type of the function findViewById int id?

As mentioned by @Jon Skeet in comments, findViewById(int id) method returns view(not subviews) in general, but this method is generic and can returns subviews if the compiler knows the type of target class, so in this case, casting is redundant, but in the case that, the type of target class is unconstrained, you have …

What is findViewById Kotlin?

findViewById(int id) is very useful function to access or update properties of Views (Direct and Indirect Classes of android. view. View). Some of the regularly used Views are LinearLayout, TextView, Button, EditText, ImageView etc.

What is the disadvantage of calling findViewById?

What’s the Problem With findViewById. The problem with using findViewById(id) calls is that they feel needlessly tedious and can lead to runtime crashes. In this simple Fragment I wrote 10 lines of code just to initialize references to my View objects in code. And that’s in addition to defining these Views in XML.

Is findViewById () the method used to find the view object given its ID number?

The Android SDK provided a method: findViewById() . Functionality-wise, this method performs a singular task — it will give you the reference to the view in XML layouts by searching its ID. And if nothing is found, it will give you the good old NULL , which is said to be the 1-billion dollar mistake by its creator.

What is view Viewgroups?

View is a basic building block of UI (User Interface) in android. A view is a small rectangular box that responds to user inputs. Eg: EditText, Button, CheckBox, etc. ViewGroup is an invisible container of other views (child views) and other ViewGroup.

Can a view contain ViewGroup?

ViewGroup is a invisible container of other views (child views) and other viewgroups. Eg: LinearLayout is a viewgroup which can contain other views in it. ViewGroup is a special kind of view which is extended from View as its base class. ViewGroup is the base class for layouts.

Do we need findViewById in Kotlin?

Kotlin Android Extensions To solve the issue of writing useless code, JetBrains has created the Kotlin Android Extensions which have a number of features, but exist primarily to avoid the need for findViewById code. Using them is straightforward, you simply need to import kotlinx.

Is findViewById deprecated?

findViewById. Recently Android has announced that with Kotlin 1.4. 20, their Android Kotlin Extensions Gradle plugin will be deprecated and will no longer be shipped in the future Kotlin releases.

How do I stop findViewById?

Use view binding in an Activity You don’t have to call findViewById when using view binding — instead just use the properties provided to reference any view in the layout with an id. The root element of the layout is always stored in a property called root which is generated automatically for you.

What are the different types of ViewGroups?

Following are the commonly used ViewGroup subclasses used in android applications.

• FrameLayout.
• WebView.
• ListView.
• GridView.
• LinearLayout.
• RelativeLayout.
• TableLayout and many more.

What is the difference between ViewGroup and view?

View is a simple rectangle box that responds to the user’s actions. ViewGroup is a collection of Views(TextView, EditText, ListView, etc..), somewhat like a container. A View object is a component of the user interface (UI) like a button or a text box, and it’s also called a widget.

Is layout a ViewGroup?

The ViewGroup is the base class for Layouts in android, like LinearLayout , RelativeLayout , FrameLayout etc. In other words, ViewGroup is generally used to define the layout in which views(widgets) will be set/arranged/listed on the android screen.

How to get the root view of a view in Android?

Actually just findViewById(android.R.id.content) is giving me the root view. If that is not true in some cases I can get root view from the findViewById(android.R.id.content).getRootView().

What is findviewbyid in Android?

Finds the first descendant view with the given ID, the view itself if the ID matches #getId (), or null if the ID is invalid (< 0) or there is no matching view in the hierarchy. [Android.Runtime.Register (“findViewById”, ” (I)Landroid/view/View;”, “”)] public Android.Views.View?

How to get the rootview of a view group?

Inside our activity we can get the rootview with: ViewGroup rootView = (ViewGroup) ((ViewGroup) this .findViewById(android.R.id.content)).getChildAt(0); or View rootView = getWindow().getDecorView().getRootView(); Share Improve this answer Follow edited Jun 20 ’20 at 9:12 CommunityBot 111 silver badge

What does findviewbyid Int32 mean?

FindViewById (Int32) Finds a view that was identified by the id attribute from the XML that was processed in OnCreate (Bundle).