Layouts | Intent | Event | XML |Android App Development Tutorial in Hindi | Android Studio #20
A ViewGroup is a special view that can contain other views (called children.) The view group is the base class for layouts and views containers. This class also defines the ViewGroup.LayoutParams class which serves as the base class for layouts parameters
A layout defines the structure for a user interface in your app, such as in an activity. All elements in the layout are built using a hierarchy of View and ViewGroup objects. A View usually draws something the user can see and interact with. Whereas a ViewGroup is an invisible container that defines the layout structure for View and other ViewGroup objects, as shown in figure 1.
Declare UI elements in XML. Android provides a straightforward XML vocabulary that corresponds to the View classes and subclasses, such as those for widgets and layouts.
You can also use Android Studio’s Layout Editor to build your XML layout using a drag-and-drop interface.
Instantiate layout elements at runtime. Your app can create View and ViewGroup objects (and manipulate their properties) programmatically.
Crashing if the user receives a phone call or switches to another app while using your app.
Consuming valuable system resources when the user is not actively using it.
Losing the user’s progress if they leave your app and return to it at a later time.
Crashing or losing the user’s progress when the screen rotates between landscape and portrait orientation.
This document explains the activity lifecycle in detail. The document begins by describing the lifecycle paradigm. Next, it explains each of the callbacks: what happens internally while they execute, and what you should implement during them. It then briefly introduces the relationship between activity state and a process’s vulnerability to being killed by the system. Last, it discusses several topics related to transitions between activity states.
For information about handling lifecycles, including guidance about best practices, see Handling Lifecycles with Lifecycle-Aware Components and Saving UI States. To learn how to architect a robust, production-quality app using activities in combination with architecture components, see Guide to App Architecture.
Activity-lifecycle concepts
To navigate transitions between stages of the activity lifecycle, the Activity class provides a core set of six callbacks: onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy(). The system invokes each of these callbacks as an activity enters a new state.
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Firebase Tutorial No-6 URl-
Firebase Tutorial No-1 URl-
Firebase Tutorial No-2 URl-
Firebase Tutorial No-3 URl-
Firebase Tutorial No-4 URl-
Write program url using Firebase Database-
https://www.dropbox.com/s/wxggu30ajqa992c/FirebaseDemo%20%282%29.zip?dl=0
Sqlite database tutorials part-1 url-
Sqlite database tutorials part-2 url-
Storage option url-
https://www.youtube.com/watch?v=KgCfx…
Internal Storage url-
https://www.youtube.com/watch?v=O-VKJ…
External Storage url-
https://www.youtube.com/watch?v=EteGm…
Shared Prefrences url-
https://www.youtube.com/watch?v=KZJC2…
Spinner Url-
https://www.youtube.com/watch?v=o3KZz…
CustomListView Url-
https://www.youtube.com/watch?v=2geTp…
ListView In Android Studio Part-1
https://www.youtube.com/watch?v=taItn…
ListView In Android Studio Part-1
ListView In Android Studio Part-2 With EventHandling
https://www.youtube.com/watch?v=F3tsW…
ListView In Android Studio Part-3 With EventHandling
https://www.youtube.com/watch?v=fCh5D…
Firebase:-
https://www.youtube.com/watch?v=Lncmj…
How to Install Java Url-
https://www.youtube.com/watch?v=NXlHE…
GridLayout url-
https://www.youtube.com/watch?v=B3TUS…
TableLayout url-
https://www.youtube.com/watch?v=wbV3t…
RelativeLayout-
https://www.youtube.com/watch?v=80Kk_…
https://www.youtube.com/watch?v=1jnNF…
Linearlayout-
https://www.youtube.com/watch?v=yY3xL…
https://www.youtube.com/watch?v=vnEdL…
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