The Android SDK provides a class called View that is the base class for all user interface components. It provides the methods and properties necessary to render components on the screen.
A view can be composed of other views, but it can also contain widgets that are not views. For example, a TextView is not a View but it is contained by one or more Views.
The hierarchy of views in an Android app is similar to the hierarchy of objects in Java because they both use inheritance. The View class inherits from android.view.ViewGroup which inherits from android.view.ViewRootImpl which inherits from java.lang.Object
The object hierarchy is a way to organize the objects in an Android project. It helps developers to keep track of all the objects and their relationships with each other. The hierarchy can be used for designing the UI, managing the data, and creating new objects.
The advantages of using an object hierarchy in Android development are:
It helps developers to keep track of all the objects and their relationships with each other.
The hierarchy can be used for designing the UI, managing the data, and creating new objects.
Organizing an app is not easy, especially if it has a lot of features. There are many ways to organize an app, but one of the most popular ways is through object hierarchy. This is when you divide your app into smaller pieces and organize them in a hierarchical manner.
Object hierarchy helps to organize complicated apps by dividing them into smaller pieces and organizing them hierarchically. The idea behind this approach is that it can be easier to manage these objects separately than managing everything at once. This way, developers can focus on one object at a time and then move onto the next object when they are finished with the first one.
A callback interface is a type of programming interface that allows for the passing of a function as an argument to another function. The callback function is invoked by the called function when it has completed its task. The callback interface can be used in Android development to create applications that are more responsive and interactive. Android provides developers with various types of callback interfaces, such as onClick(), onKey(), and onTouch().
Intents are a mechanism that Android uses to allow applications to share data. There are four types of intents:
A category intent is used to start an activity.
A content intent is used to send or receive data from another app.
An action intent starts a service.
A broadcast intent sends a message to all receivers of a particular type.
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