What is a ViewStub?
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.
How to use ViewStub?
How to use ViewStub in Android :
- id: ViewStub defined can be found using the id.
- inflatedId: This attribute is used to set the id of the inflated View.
- layout: This attribute is used to supply an identifier for the layout resource to inflate.
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?
When the ViewStub is inflated, it replaces itself in its parent view with the inflated layout resource. Its visibility will exist in the view hierarchy only when setVisibility(int) or inflate() is invoked. The inflated view is added to ViewStub’s parent using the layout parameter.
What is FrameLayout?
In android, Framelayout is a ViewGroup subclass that is used to specify the position of View instances it contains on the top of each other to display only single View inside the FrameLayout. In android, FrameLayout will act as a placeholder on the screen and it is used to hold a single child view.
What is a ViewGroup?
ViewGroup Refer to the android. view. ViewGroup class, which is the base class of some special UI classes that can contain other View objects as children. Since ViewGroup objects are also View objects, multiple ViewGroup objects and View objects can be organized into an object tree to build a complex UI structure.
Why do we use constraint layout?
ConstraintLayout , which is now the default layout in Android Studio, gives you many ways to place objects. You can constrain them to their container, to each other or to guidelines. This allows you to create large, complex, dynamic and responsive views in a flat hierarchy. It even supports animations!
Which is the property of frame layout?
FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that’s scalable to different screen sizes without the children overlapping each other.
Is layout a view or ViewGroup?
View or ViewGroup subclasses are used to build the GUI elements. View is a basic building block of UI (User Interface) in android….Difference Table.
|android.view.View which is the base class of all UI classes.||ViewGroup is the base class for Layouts.|
Which view can hold one direct child?
lang. IllegalStateException: ScrollView can host only one direct child [duplicate]
Is constraint layout best?
xml, in Design view. Notice the structure of the layout is a series of nested LinearLayout s and RelativeLayout s. ConstraintLayout is not the best choice for simple layouts, but it’s great for complex layouts like the one in this tutorial.
Which layout is faster in android?
If you really know what you’re doing, RelativeLayouts can be faster. If you don’t, they can be much slower. Long Answer: Nesting layouts manually such as a FrameLayout within a LinearLayout versus using relative positioning in a RelativeLayout can have pros and cons either way.
What is a viewstub and what does it do?
A ViewStub is an invisible, zero-sized View that can be used to lazily inflate layout resources at runtime. It is a dumb and lightweight view. It does not participate nor draws anything in the layout.
Where do I find viewstub in Android Studio?
The ViewStub thus defined can be found using the id “simpleViewStub”. After inflation of the layout resource “mySubView,” the ViewStub is removed from its parent. The View created by inflating the layout resource “mySubView” can be found using the id “subView,” specified by the inflatedId property.
How to make a viewtub visible in Java?
To make ViewStub visible or invisible, setVisibility (int) method is invoked. The View.VISIBLE constant is used for making ViewStub visible and View.GONE constant is used for invisible.
How to set the ID of viewstub inflatedid?
Attributes of ViewStub Attributes Description id To uniquely identify a ViewStub inflatedId To set the id of the inflated View. Via layout To supply an identifier for the layout r