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Barry Burd
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Published:
November 7, 2016

Java Programming for Android Developers For Dummies

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Overview

Develop the next killer Android App using Java programming!

Android is everywhere! It runs more than half the smartphones in the U.S.—and Java makes it go. If you want to cash in on its popularity by learning to build Android apps with Java, all the easy-to-follow guidance you need to get started is at your fingertips. Inside, you'll learn the basics of Java and grasp how it works with Android; then, you'll go on to create your first real, working application. How cool is that?

The demand for Android apps isn't showing any signs of slowing, but if you're a mobile developer who wants to get in on the action, it's vital that you get the necessary Java background to be a success. With the help of Java Programming for Android Developers For Dummies, you'll quickly and painlessly discover the ins and outs of using Java to create groundbreaking Android apps—no prior knowledge or experience required!

  • Get the know-how to create an Android program from the ground up
  • Make sense of basic Java development concepts and techniques
  • Develop the skills to handle programming challenges
  • Find out how to debug your app

Don't sit back and watch other developers release apps that bring in the bucks! Everything you need to create that next killer Android app is just a page away!

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About The Author

Barry Burd, PhD, is a professor in the Department of Mathematics and Computer Science at Drew University in Madison, New Jersey. He has lectured at conferences in the United States, Europe, Australia, and Asia. He hosts podcasts and videos about software and other technology topics. He is the author of many articles and books, including Java For Dummies.

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CHEAT SHEET

Android is the open source, Linux- and Java-based, software framework for mobile and portable devices. The Android operating system powers 86% of all smartphones in the world today. Android not only has a majority of users, but with the help of a (very well designed) Java-based software development kit (SDK, for short), developing apps can be straightforward and fun.
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Everyone makes mistakes. It’s a fact of life. However, if you heed the advice here, it doesn’t have to be a fact of your Java programming. Putting capital letters where they belong Java is a case-sensitive language, so you really have to mind your ps and qs — along with every other letter of the alphabet. Here are some concepts to keep in mind as you create Java programs: Java’s keywords are all completely lowercase.
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This list gives you ten useful and fun websites that you can use when developing with Java. Each one has resources to help you use Java more effectively. And currently, none of these sites uses adware or pop-ups or other grotesque programs. Book websites For all matters related to the technical content of Java Programming for Android Developers For Dummies, 2nd Edition, visit www.
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If you look in the app/manifests branch in Android Studio's Project tool window, you see an AndroidManifest.xml file. The file isn't written in Java; it's written in XML.Here is some code from an AndroidManifest.xml file. With minor tweaks, this same code could accompany lots of examples.<activity android:name=<strong>".
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Java has many collection classes you can use in your Android app. The ArrayList class is only the tip of the Java collections iceberg. The Java library contains many collections classes, each with its own advantages. This table contains an abbreviated list. Some Collection Classes Class Name Characteristic ArrayList A resizable array.
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You can use a Java constructor call in your Android app. A constructor call creates a new object from an existing class. You can spot a constructor call by noticing that A constructor call starts with Java's new keyword: new BagOfCheese() and A constructor call's name is the name of a Java class: new <strong>BagOfCheese</strong>() When Java encounters a method call, Java executes the statements inside a method's declaration.
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"I have to create an enhanced for statement. Can someone remind me how to code an enhanced for statement? And while you're at it, how can I catch an exception? Where can I find all that Java stuff quickly?"You find all that stuff right here in this cheat sheet. The Java program in this cheat sheet contains snippets of code representing many of Java's most important language features, including switches, strings, breaks, if .
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A bare-bones Android project contains over 1,000 files in nearly 500 folders. That's a lot of stuff. If you expand some of the branches in Android Studio's Project tool window, you see the tree shown. The Project tool window displays some parts of an Android app.For many examples, you can forget about 99 percent of the stuff in the Project tool window.
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For your Android app to communicate with Twitter servers, you need your own OAuth keys and tokens. To get them, just follow these simple steps. The following instructions apply to the Twitter web pages for current developers. Twitter might change the design of its website at any time without notice. Sign in to your Twitter user account (or register for an account if you don't already have one).
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Coding the behavior of your Android app depends on how much work you want to do. Android 1.6 (also known as Donut) introduced an android:onClick attribute that streamlines the coding of an app's actions. Here's what you do: Launch Android Studio. Make sure you have already created the “look” for your app. If you don't see the Designer tool with its preview screens, double-click the app/res/layout/activity_main.
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Objects can be a very useful tool in your Android app. Check out the code below which illustrates Java in action. This code contains real-life Java code to create two objects.package com.allmycode.a09_02; import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.TextView; <strong>import com.
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So, you want to see the fundamentals of Android app development in one small example? How about the Empty Activity app that Android Studio creates for you automatically? Too simple? How about adding a button and a menu?When you launch this section's app, you see a button with the words CLICK ME on its face. When you click the button, the button's text changes to I'VE BEEN CLICKED.
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A general guideline in Android app development tells you to separate logic from presentation. In less technical terms, the guideline warns against confusing what an app does with how an app looks. The guideline applies to many aspects of life. For example, if you're designing a website, have artists do the layout and have geeks do the coding.
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You can make meaningful use of Java's logical operators in your Android app. In the code below, the app gets two pieces of information from the user. The app gets a person's age, and gets a check or no-check, indicating a movie's special showing status.package com.allmycode.a06_01;import android.support.v7.app.
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Sometimes, you want to give your Java object more to do in your Android app. Consider this: You have a printer and you try to install it on your computer. It's a capable printer, but it didn't come with your computer, so your computer needs a program to drive the printer: a printer driver. Without a driver, your new printer is nothing but a giant paperweight.
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In the Android world, things change very quickly. The folks at Google are always creating new features and new tools. The old tools stop working and the old instructions no longer apply. If you see something on your screen that doesn't look like familiar, don't despair. It might be something very new, or you might have reached a corner of the software that is a dark corner.
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You can inherit a lot from your parents. Maybe not the ability to code your Android app with Java, but that’s another discussion. One thing you can't inherit is their experiences of having been born. Yes, you can see pictures that your grandparents took. But that's not the same as having been there.At this point, you may feel like quibbling.
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In Java, elements that start with an at-sign (@) are annotations. In the following code, the @Override annotation reminds Java that the method immediately below the annotation has the same name and the same parameter types as a method in the parent class. The use of the @Override annotation is optional. If you remove all @Override lines, the code works the same way.
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You can set access for fields and methods in your Android app. A Java class can have either public access or nonpublic (default) access. But a member of a class has four possibilities: public, private, default, and protected. A class's fields and methods are the class's members. Here's how member access works: A default member of a class (a member whose declaration doesn't contain the words public, private, or protected) can be used by any code inside the same package as that class.
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When programming your Android app with Java, you could use getters and setters. In this code, the UseAccount and UseAccountFromOutside classes can set an account's customerName and get the account's existing customerName:account.customerName = "Occam";String nameBackup = account.customerName;But neither the UseAccount class nor the UseAccountFromOutside class can tinker with an account's internalIdNumber field.
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The key to succeeding with Java programming is to keep it simple. Most programs operate entirely in the virtual realm. They have no bricks, nails, or girders. You can type a fairly complicated program in minutes. Even with no muscle and no heavy equipment, you can create a structure whose complexity rivals that of many complicated physical structures.
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A good chunk of code in your Android app will likely begin with the word public. When a class is public, any program in any package can use the code (or at least some of the code) inside that class. If a class isn't public, then for a program to use the code inside that class, the program must be inside the same package as the class.
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There are a couple of things you want to think about when reusing names in your Android app. You could declare two Java variables — bag1 and bag2 — to refer to two different BagOfCheese objects. That's fine. But sometimes, having only one variable and reusing it for the second object works just as well, as shown here.
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When you start a new Java project, Android Studio offers to create an activity for your project. Android Studio offers you several different kinds of activities, such as a Basic Activity, an Empty Activity, a Login Activity, and so on. If you ask for an Empty Activity, you get this code:package com.allyourcode.
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