Kotlin Extensions
Let's go into some specifics regarding the most important Kotlin extensions that each and every Android developer and programmer need to be familiar with:
Android KTX:
Android Kotlin Extensions, also known as Android KTX, is a collection of features that, when used in conjunction with the Kotlin programming language, make it possible for Android application creation that is both simple and enjoyable. If you are an Android developer, you have probably grown weary of utilizing the outdated and corroded Java APIs for Android. Therefore, in order to access the Java Android APIs in Kotlin in a more straightforward manner, the developers working on the Android team created Android KTX.
The purpose of Android KTX is not to expand the capabilities of the pre-existing Android APIs; rather, it is to simplify the process of developing Android apps by making use of the APIs that are already available.
The Android KTX operating system has a wide variety of functions, some of which are as follows:
- Extension functions: These are the functions that help us to extend the functionality of the class without getting into the code of that class. Instead, all you have to do is call the function of the class in order to extend the functionality of the class. Extension functions are also known as helper functions.
- Extension attributes are supported as well by the Kotlin programming language. However, in order to utilize the extension property in Kotlin, you need to give the getter in an explicit manner (plus setter for vars).
- Named parameters are a feature that are unique to this object-oriented programming language and cannot be found in any other language of its kind. The names of the parameters that you are giving to a function may be specified in Kotlin thanks to a feature that the language offers.
- Default values for parameters: Kotlin allows you to provide the arguments of a function default values that they should use.
Firebase:
Firebase is a development platform that can be used for both mobile and online applications. It offers services that a mobile application or web application might require in order to function properly. Firebase eliminates the burden of having to construct a backend specifically for user authentication by providing email and password authentication for users.
Firebase is an extension for the Kotlin programming language that has the potential to completely revolutionize the future of Android development as well as the process of managing the experiences of users who are actively interested in Android applications. The beta version of Firebase is now available on the market, and it will provide you with more capabilities. If any errors appear, however, they will be fixed as soon as you report them.
There is no need to worry about the safety of your smartphones or computers onto which Firebase has been loaded since cybercriminals cannot directly manipulate the privacy and security of the information in the same way that they can with Kotlin interfaces. Therefore, from today and moving forward, every Android developer, regardless of their level of expertise, will be required to become proficient in the usage of the Firebase Kotlin SDK in order to construct high-quality applications that operate efficiently on Android.
Double.toPrice():
Formatting with group separation is another enhancement that might be quite helpful when dealing with pricing. The majority of the time, inside an app, we just adhere to a single set of guidelines for structuring prices. The display of pricing across the app may be handled by a single extension.
For the purpose of making the price simpler to see, this modification involves the use of two fractional (monetary) digits, the display of a comma between the two, and the splitting of each of our three numbers with a dot.
If you are an Android developer or programmer, you should definitely give this helpful extension a go at least once. It works well with pricing and formats them in accordance with just one set of rules.
Context.screenSize:
Access to information on the status of the application may be gained via the use of a Context. It grants Activities, Fragments, and Services access to resource files, graphics, themes, and styles, as well as the locations of external directories. In addition to that, it offers access to the built-in services that are available on Android, such as those used for layout inflation, identifying content providers, and keyboarding.
In many situations in which the "context is necessary," all that is asked of us is to simply pass in the instance of the activity that is currently being performed. When we are operating inside of objects that were generated by the activity, such as adapters or fragments, we need to ensure that we are passing the activity instance into those objects.
Null Receiver:
When it comes to creating the extension functions with the class type, this Nullable Receiver extension is both exact and versatile (Nullable). In addition, the extension assures that Kotlin is null safe by clearly differentiating between references that may be null and those that cannot be null. This, in turn, avoids any problems that may have occurred during the compilation process. If you are not already using this extension, there is a chance that you will be presented with this particular NPE (Null Pointer Exception).
String.isAlphanumeric:
Validating whether or not a string contains alphanumeric characters is the responsibility of the String.isAlphanumeric extension. The only characters that can be found in an alphanumeric string are letters like a-z, A-Z, and numerals in the range from 0 to 9. An alphabetic string will ignore any special characters such as %, @, &, or $.
String.toLocation:
This String.toLocation function is essentially a Kotlin String extension that transforms a string into a place with certain longitudinal and latitudinal values, such as 53.45 and -0.943, respectively. When using this extension, it is not necessary to submit any information on the location provider.
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source: https://echoinnovateit.weebly.com/blog/7-kotlin-extensions-for-developers-must-know