Android is an operating system for mobile devices like smartphones and tablet computers that is open source and based on Linux. The Open Handset Alliance, headed by Google, and other businesses created Android. This course will walk you through some advanced ideas in Android application development in addition to teaching you the fundamentals of Android programming. Java is the foundational programming language for Android development. All other mobile operating systems are being outsold by Android on a global scale. Without a question, Android developers will have the advantage and a promising future
For all Android developers throughout the world, Android is a wonderful and growing opportunity. The majority of smartphone users utilize Android, hence there is always a need for Android applications. More and more Android developers are needed as there is a growing need for more and more applications. Android is incredibly adaptable and open source. Low investment costs and significant returns are associated with Android development. Indeed, the developer framework for Android is excellent. It assists us in developing highly intriguing new ideas based on the services already provided by android devices.
Extension Function in Java
An interesting element that aids in Android app development is extension functionalities. Without needing to employ design patterns like Decorator or inherit from them, they enable the addition of additional functionality to classes. Writing utility classes, typically referred to as Utils, that include static methods that take classes as arguments and operate on their public members is a common task when using the Android framework.
Modifying third-party classes to add functionality that makes use of public members is another example of a use case. Extension functions in java come to the rescue in these circumstances. They offer a convenient syntactic sugar that enables you to adjust how you call such methods so they appear to be standard member functions. They merely create new functions that can be called using the dot notation rather than altering the class itself. A receiver type that you want to extend must come before the function name when declaring an extension function.
Extension Functions in Android
Android has Extension functions like extension function in java. Although they are internally converted into standard Java functions, the coding interface looks cleaner as a result. Let us look at some of the key extension functions.
- Complex units
You need to programmatically set the font size and box width but in terms of dp and sp? In Kotlin, you can create an Extension value, but in Java, you would want to use a function. This is the extension function used for the above-said purpose.
- String substring
You are aware of how to use str[index] to extract a character from a string. What happens if you need a substring but detest typing that lengthy function? the get operator function, which would return the substring within the specified index range, using an IntRange parameter.
- Repeating a string
An additional frequently used operator extension function. With the aid of this function, we have taken care of the two common ones.
- Toast Message
The simplest extension function is this one, and every article will advise you to have it. Now you may more easily display a toast in your Activity or Fragment by using this function.
- Android Resources
There is a straightforward procedure available if your Kotlin code needs any resources. Calling your Extension method instead of your boilerplate code will result in cleaner code. Use a suitable Annotation for debugging so that you are aware if you pass the incorrect resource type.
Java is adored by all Android developers, but its full potential can only be realized if we make the most of it. Java is a language that is always evolving, and it gets better with each new version. The extension functions in java offer great help to its developers and it also brings a bright future to the android developing community.