Despite a failing economy, Smartphone sales are still growing quarter over quarter with the International Data Corporation announcing that Smartphone sales last year grew by 45.3% year-over-year. This huge growth is fueling the demand for android apps and learning android development now could really boost your career options in the near future and most likely in the long term as well. Learning android development can seem intimidating at first, but if you know enough about the basics then learning android development doesn’t need to be hard.
If you have some previous programming experience, know about object oriented programming, have some basic java experience and experience in XML, then you can dive in head first by enrolling in the Learn Android Development From Scratch course now. This course is a complete guide for learning to create programs for the Android environment. It contains over forty lectures that will teach you to create full android applications and games. It will explain the core concepts of android programming, it will teach you about the features and specifications of the Android SDK. It also covers Eclipse ADT and the Android SDK. Once you’ve completed the course you will be able to work on commercial and freelance Android projects.
Although it is possible to learn android development without any previous programming experience, some knowledge in object oriented programming, java, XML and SQL will help you to make sense of android development and help you learn to create apps a lot quicker. Here are some of the basics you should take the time to learn before you try to learn android programming:
1. Basic concepts of Object-orientated programming
2. Basics of the Java programming language
3. The basics of XML
Android apps generally use classes and objects as part of the app development. It is therefore helpful to understand what classes and objects are in an object-oriented programming environment and how classes and objects work.
Objects in Object oriented are predefined data structures that have certain qualities that are predetermined and recognized by the program. Let’s take a simple example that most people would understand. Let’s create an object called a cat. The cat object will be defined as an object that has a name, breed and gender. To create an instance of cat, we need to instantiate the instance of cat by calling it within our program. So we can now create two instances of a cat without having to define a new object for each instance. The beauty of object orientated programming is that we can cut out a lot of duplication and coding by creating classes and objects and then using those objects over and over again. To create of two cat objects the code would look something like this:
Cat DannyCat = newCat [“Danny”, Persian, male]
Cat TiggerCat = newCat [“Tigger”, Siamese, female]
Now that you know what an object is, you need to know how to define objects in the first place. This is where classes come in. Classes are written to provide definitions for the objects you will use in your android apps or in your programs. Classes are generally defined in their own class files and stored in a library for easy access. To include an object within your code you first need to tell the code where to find the definition of the object and you do so by including an include statement at the beginning of the code. The “include” statement would look something like this:
Classes do more than merely define an object. Classes also assign methods to the object. In the case of our cat object, a method would be equivalent to meouw or scratch.
One more aspect you need to understand with regards to OOP and android development is the concept of inheritance. Inheritance is a concept that allows classes to inherit attributes from parent or super classes. So if we continue with our cat class as the superclass, we could add a subclass called domestic cats and add extra attributes to our domestic cat class called “food” to store information about the brand of food domestic cats eat. The domestic cat object will inherit the attributes of the main class and store our new attributes as well.
As mentioned, learning android development is a lot easier when you have a basic understanding of Java programming. Most Android applications use Java syntax for coding, so a basic knowledge of Java syntax will help you to understand the code a lot quicker.
Most programming languages allow for comments and Java is no different. Comments allow you to create explanations of your code for later reference or for use by other programmers. Comments in Java take one of two forms: the multiline comment and the inline or single line comment.
This is what a multiline comment looks like:
This is a single line comment:
int y = 0; // First variable called y equals zero
The definition of variables is also important since variables generally form the lifeblood of any program. Declaring variables in Java is fairly simple. Variables are generally divided into objects or primitive data types like integers, float, double and char.
It is important to note that a variable is only valid for the scope of the variable. That means its valid for the section of code contained within the curly braces. A variable is generally assigned using the equal sign. Java also makes use of unary operators to increase or decrease a variable. For example to increment x by 1, if you are using it as a counter in a programming loop for example then x++ would increment x by one for each loop.
Finally, Android makes use of a number of Java objects like the String object and it is helpful therefore to have some knowledge of the most common object types in Java.
If you would like to improve your Java programming skills then sign up for the Programming Java for Beginners – The Ultimate Java Tutorial course today. This course offers over one hundred lectures that will teach you how to program in Java. It includes information on object-oriented programming, classes, objects, loops and more. It is aimed at beginners and those who want to improve their java skills. It will teach you about the various data types in Java, variables, operators and expressions, and much more.
XML and SQLLite
There are two possible reasons why you should invest some time in getting to know the basics of XML before you start learning android development. The first reason is that the UI or user interface is written using XML so it may be important to understand how to write and structure XML. There are however developer environments that allow you to avoid setting up your UI using XML so you may not necessarily need XML for the UI. The second reason is that most apps these days interface with the internet for one reason or another. Since most of the data on the internet is written or formatted using XML, it may be important for you to understand the format and syntax of XML. Luckily, you don’t necessarily need an in-depth knowledge of XML and a simple XML tutorial will teach you the basics you will need to know.
If your android application requires a database then knowledge of basic SQL syntax will also be useful. SQLLite is automatically embedded into android devices and it is therefore the database of choice for android applications. Once again, you don’t need to become a SQL wizard but a basic knowledge of the syntax and methods used in SQL are highly advantageous. The Insert, update and delete methods commonly used in SQL also apply to this version of SQLLite. To search the database, the “query” or rawQuery methods can be used.
Learn Android Development
As mentioned above, it is not a prerequisite to understand OOP, Java and XML to develop android applications but if you have these foundations, it’s a lot easier to understand and learn. Luckily some android development courses include these concepts within the course itself.
Get started today and learn android development by checking out the Android 101: Android Development for Beginners course. This course offers over ninety lectures that will teach you about OOP and the basics of Java. The course will also take you through the step by step process of creating an android application. It will teach you about event listeners and how to create them. It will teach you how to work with Android widgets and how to store information. It will also show you how to add audio and video to your android applications.