What is ViewStub in Android?

What is ViewStub in Android?

android.view.ViewStub. A ViewStub is an invisible, zero-sized View that can be used to lazily inflate layout resources at runtime. When a ViewStub is made visible, or when inflate() is invoked, the layout resource is inflated. The ViewStub then replaces itself in its parent with the inflated View or Views.

Why use ViewStub?

Simply a ViewStub is used to increase efficiency of rendering layout. By using ViewStub, manually views can be created but not added to view hierarchy. At the runtime, can be easily inflated, while ViewStub is inflated, the content of the viewstub will be replaced the defined layout in the viewstub.

How do I use view stubs on Android?

A ViewStub is a zero-sized invisible View which is used to load “layout resource” at runtime. ViewStub is a zero dimension View, so you will not see anything on the layout pallete. To make parent resource visible, inflate() method is invoked. To make ViewStub visible or invisible, setVisibility(int) method is invoked.

What is Stubview?

In Android, ViewStub is zero sized invisible View that can be used to lazily inflate layout resource at runtime. It is a dumb and lightweight view. The special thing about ViewStub is that it neither participate nor draw anything in the layout. It has zero dimension.

How do you use AsyncLayoutInflater?

Android Documentation: To use, construct an instance of AsyncLayoutInflater on the UI thread and call inflate(int, ViewGroup, OnInflateFinishedListener) . The AsyncLayoutInflater. OnInflateFinishedListener will be invoked on the UI thread when the inflate request has completed.

What is layout inflation in Android?

android.view.LayoutInflater. Instantiates a layout XML file into its corresponding View objects. It is never used directly. Instead, use Activity.

What is Nav_host_fragment?

NavHostFragment provides an area within your layout for self-contained navigation to occur. NavHostFragment is intended to be used as the content area within a layout resource defining your app’s chrome around it, e.g.:

What is NavGraph?

NavGraph is a collection of NavDestination nodes fetchable by ID. A NavGraph serves as a ‘virtual’ destination: while the NavGraph itself will not appear on the back stack, navigating to the NavGraph will cause the starting destination to be added to the back stack.

Why We Use inflate in android Studio?

“Inflating” a view means taking the layout XML and parsing it to create the view and viewgroup objects from the elements and their attributes specified within, and then adding the hierarchy of those views and viewgroups to the parent ViewGroup.

What is a ViewGroup in android?

A ViewGroup is a container to hold views. All the android activities, fragment layouts, etc. are ViewGroups. The ViewGroup classes are extended from Views. They are used as containers on the android app screen.

What is NAV host?

The navigation host is an empty container where destinations are swapped in and out as a user navigates through your app. A navigation host must derive from NavHost . The Navigation component’s default NavHost implementation, NavHostFragment , handles swapping fragment destinations.

What is onSupportNavigateUp?

onSupportNavigateUp() This method is called whenever the user chooses to navigate Up within your application’s activity hierarchy from the action bar. ActionMode. onWindowStartingSupportActionMode(ActionMode.Callback callback) Called when a support action mode is being started for this window.

What is jetpack Library in Android?

Jetpack is a suite of libraries to help developers follow best practices, reduce boilerplate code, and write code that works consistently across Android versions and devices so that developers can focus on the code they care about.

What is inflate () in android?

In this context, Inflate means reading a layout XML (often given as parameter) to translate them in Java code. This process happens: in an activity (the main process) or a fragment.

What is inflating a layout?

What is difference between View and ViewGroup?

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.

How does navigation work on Android?

Navigation refers to the interactions that allow users to navigate across, into, and back out from the different pieces of content within your app. Android Jetpack’s Navigation component helps you implement navigation, from simple button clicks to more complex patterns, such as app bars and the navigation drawer.