Kotlin For Android Developers

Kotlin For Android Developers

Kotlin For Android Developers

Kotlin is a new programming language from JetBrains, the maker of the world’s best IDEs. Now Kotlin supported by Google For Android.
 
Kotlin comes from industry, not academia. It solves problems faced by working programmers today. As an example, the type system helps you avoid null pointer exceptions. Research languages tend to not have null at all.

1. Why Kotlin

 
1.1 Java Interoperability
 
Kotlin language is inter-operable with java. It means we can user previous java project with new kotlin classes also and all java frameworks are still available. We have a one click java to kotlin converters also.
 
1.2 Familiar syntax
 
Kotlin Language syntax is very familiar to any programing language who came from OOP domine. There are some differences compare to Java such as val, var
 
Class Example{
 
val a:String= “Kosmik” //val means unmodifiable
 
Var i:int=1 // var means modifiable
 
}
 
Fun hellworld(){
 
Val str=”hello”
 
print(“$str World”)
 
}
 
1.3 String Interpolation
 
It’s as if a smarter and more readable version of Java’s String.format() built into the Kotlin language
 
var x=4
 
var y=3
 
print(“sum of $x and $y is ${x+y}”) //sum of 4 and 7 is 11
 
1.4 Open Source
 
It is open source under apache 2.0
 
1.5 Compatibility
 
Kotlin is fully compatible with JDK6 and kotlin applications can run on older android devices also
 
1.6 Performance
 
Kotlin application will run fast as an equal to java
 
1.7 Support
 
Kotlin is fully supported from Android Studio 3.0
 
1.8 Some Syntaxes
  1. No more semicolons ;
  2. Variable declaration is different in kotlin like var is mutable and val is immutable
  3. Functions in kotlin (methods)

fun sum (x: Int ,y: Int): Int{

return x+y

}

  1. when function

Now switch changed into when a condition, which is very easy to understand  like below example

when (x) {

   1 -> print(“x is 1”)

   2 -> print(“x is 2”)

   3, 4 -> print(“x is 3 or 4”)

   in 5..10 -> print(“x is 5, 6, 7, 8, 9, or 10”)

   else -> print(“x is out of range”)

}

6.creating a class in kotlin

val rectangle = Rectangle(5.0, 2.0) //no ‘new’ keyword required

val triangle = Triangle(3.0, 4.0, 5.0)

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Brief History of Android

Brief History of Android

What Is Android?

 Android is an operating system for mobile devices. Such as smartphones and tablet computers. It invented by the Open Handset Alliance led by Google. It built on a Linux foundation. Google purchased the initial developer of the software, Android in 2005. An Android distribution on November 5, 2007, was announced. Android founder of Open Handset Alliance. The consortium of 84 hardware, software, and telecommunication companies standards for mobile devices.

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This alliance shares a common goal of fostering innovation on mobile devices. The consumers a far better user experience is available on today’s mobile platforms. It provides developers with a new level of openness. That enables them to work more Android will speed up the pace. Which new compelling mobile services made available to consumers. Android is often symbolized by the green robot to the right.

Android has evolved since its launch. Google has named all projects after a dessert. The main releases listed below, this is nothing you have to memorize. It’s to illustrate the rapid pace of development and all the innovations. Android developed “on Internet time”, that is much faster than the old style of development Android Training  Hyderabad.

Features & Specifications

Android is an Operating System supporting a large number of Smart Phones. These applications make life more comfortable and advanced for the users. Hardware that supports Android based on ARM architecture platform.

Android comes with an Android market which is an online software store. It developed by Google. Android users to select, download applications developed by third-party developers use them. There are around 2.0 lack+ games, application, and widgets available on the market for users use in Android Training  Hyderabad.
 
  Android applications are written in Java programming language. Android is available as open source for developers to develop applications. This further used for selling in an android market. There are 200000 applications developed for Android with over 3 billion+ downloads. Android relies on Linux version 2.6 for core system services. It has security, memory management, process management, and network stack and driver model.

Applications

These are the basics of Android applications

Android applications composed of one or more application components
• Each component performs a different role in the application behavior activated
• The manifest file must declare all components in the application. It all application requirements the least version of Android hardware configurations required
• Non-code application resources should include alternatives for different device configurations
 
Google, for software development and application development. It launched two competitions ADC1 and ADC2 innovative applications for Android. It offered prizes of USD 10 million combined in ADC1 and 2. ADC1 launched in January 2008 and ADC 2 launched in May 2009.

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