Android Studio App Development Tutorial

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Common Mistake #: Not Using Fragments

Android App Development Tutorial #3 Install & Setting Android Studio

A while ago in Honeycomb, Android introduced the concept of fragments. Think of them as separate building blocks with their own life cycles that exist inside an Activity. They help a lot with optimizing for various screens, they are easily managed by their parent activity, can be reused, combined and positioned at will.

Launching a separate activity for each app screen is terribly inefficient, since the system will try to keep them in memory as long as it can. Killing one wont free the resources used by the others.

Unless you want to dig deep into the Android core and read this article, advocating against fragment usage, you should use fragments whenever possible. It basically says that fragments and cursor loaders have good intended purpose, but poor implementation.

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Android Programming: Pushing The Limits

The author of this book is Erik Hellman. This book is best for you if youre an advanced developer, and you wish to know what is the thing that limits you. This can help you realize your true capabilities and limits. And then it will help you to overcome your limitations. This is definitely the best choice if youre looking for crossing your limits and learning everything about Android.

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Allowing Users To Insert To

Now that you have built an app capable of showing a list of to-do items, the next logical thing to do is to enhance it to enable users to insert more items. To accomplish this, you will create a new activity that will implement this feature. So, for starters, create a new file called activity_to_do_form.xml inside ./app/src/main/res/layout/ and add the following code to it:

This layout resource is using a ConstraintLayout to put two elements side by side:

  • an EditText where users will input the description of the new to-do item
  • a Button that, when clicked, will add the to-do item in the list.

Note that the layout above is using two string resources: @string/to_do_message and @string/button_insert. On Android development, it is a best practice to use String resources to declare static text. So, open the strings.xml file and replace its contents with this:

< !--./app/src/main/res/values/strings.xml --> < resources> < string name="app_name"> To-Do List< /string> < string name="to_do_message"> Describe your to-do item< /string> < string name="button_insert"> Insert< /string> < /resources> 

This will make your input text show a message saying “Describe your to-do item”, and will add “Insert” as the label of the button.

Next, you will create the activity’s class that will render and handle this layout. In this case, you will create a file called ToDoFormActivity.java inside the com.auth0.todo package and you will add the following code to it:

Here, you are adding two new methods:

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Android Development Tutorial

The New Boston YouTube Channel provides you the good quality android tutorials. It is one of the best channels to learn Android app development tutorials. There are more than 200 android tutorial videos explaining each and everything clearly from scratch. The only thing which we need is to have minimum knowledge on programming and knowledge of Java helps you to better learn Android app development easily with these tutorials.

Apart from android tutorials, this YouTube Channel provides videos on other programming languages like Python, Ruby on Rails, and more. The New Boston Android Tutorials are perfect for beginners of android application programming.

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The Journey Is Only Beginning

You might think thats a lot to take on board, but actually were only just scratching the surface of what you can do with Android Studio, and youll need to get to grips with a lot more as you take on more ambitious projects.

For example, if you want to make cloud-enabled apps, then youll need to start getting to grips with Firebase. Google has made this easy by building support right into the IDE itself. Just choose Tools > Firebase and then you can begin setting up cloud functionality. Likewise, you may find yourself needing to use GitHub, which lets you backup your apps online and handles version control for streamlined collaboration. Then theres the Android NDK for developing in C/C++. Of course youll also need to get familiar with Java and/or Kotlin f youre going to do anything useful at all! Youll also need to learn to use external libraries.

Google is also updating Android Studio all the time, and bringing new features and functionality to the platform which can be challenging to keep up with. The latest version at the time of writing is Android Studio 3.3, and new concepts to wrap your head around include instant apps and app bundles. Then there are the new components introduced as part of Android Jetpack, such as the Navigation Architecture Component and Slices. It never ends.

Add A Stateful Widget

Stateless widgets are immutable, meaning that theirproperties cant changeall values are final.

Stateful widgets maintain state that might changeduring the lifetime of the widget. Implementing a statefulwidget requires at least two classes: 1) a StatefulWidget classthat creates an instance of 2) a State class. The StatefulWidgetclass is, itself, immutable and can be thrown away and regenerated,but the State class persists over the lifetime of the widget.

In this step, youll add a stateful widget, RandomWords, which createsits State class, _RandomWordsState. Youll then use RandomWords asa child inside the existing MyApp stateless widget.

  • Create the boilerplate code for a stateful widget. In lib/main.dart, position your cursor after all of the code, enter Return a couple times to start on a fresh line. In your IDE, start typing stful. The editor asks if you want to create aStateful widget. Press Return to accept. The boilerplate code for two classes appears, and the cursor is positioned for you to enter the name of your stateful widget.

  • Update the build method in _RandomWordsState:

    lib/main.dart

    class _RandomWordsState extends State< RandomWords>    }
  • Remove the word generation code from MyApp by making the changes shown in the following diff:

    /lib/main.dart

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    Where To Learn Android App Development

    There are many learning courses like Coursera, Udemy, Lynda, and much more which help you to learn android application programming but they are paid courses. If you dont mind spending money, I suggest you take This top-rated Android development course on Udemy. This course will save you time.

    If you dont want to spend money, continue reading this article to know the 5 best Free websites and 5 best free YouTube Channels to which give an android app development tutorial free of cost.

    Write Your First Flutter App Part 1

    Android Tutorial For Beginners | Android Studio Tutorial | Android App Development | Edureka

    Tip: This codelab walks you through writing your first Flutter app. You might prefer to trywriting your first Flutter app on the web.

    If you prefer an instructor-led version of this codelab,check out the following workshop:

    This is a guide to creating your first Flutter app. If youare familiar with object-oriented code and basic programmingconcepts such as variables, loops, and conditionals,you can complete this tutorial. You dont needprevious experience with Dart, mobile, or web programming.

    This codelab is part 1 of a two-part codelab.You can find part 2 on .

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    Downloading The Tools You Need For Android App Development

    First, you need to create your development environment so that your desktop is ready to support your Android development goals. For that, you will need Android Studio and the Android SDK. Thankfully, these both come packaged together in a single download that you can find here.

    Android Studio is an IDE. That stands for integrated development environment, which is essentially an interface where you can enter your code and access all the different tools necessary for development. Android Studio allows you to access libraries and APIs from the Android SDK, thereby giving you access to native functions of the operating system. Youll also be able to build your app into an APK using Gradle, test it via a virtual device , and debug your code while it runs.

    With all that said, keep in mind that there are other options available for your Android app development. For example, Unity is a very powerful tool for cross-platform game development that also supports Android. Likewise, Visual Studio with Xamarin is an excellent combination for creating cross-platform apps in C#.

    We have a guide on how to create non-game apps in Unity and an introduction to Xamarin for cross platform Android development to help you out!

    Android Studio is the best place for most people to start , particularly as it provides all these additional tools and resources in a single place.

    Fortunately, set up is very simple and you only need to follow along with the instructions on the screen.

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    If you are a beginner at programming an android app, then Slidenerd YouTube Channel is perfect for you. There are hundreds of videos explaining each and every bit and that to step by step of android programming. Videos are of high quality and the person behind the teaching is most enthusiastic to explain every bit of android programming. This makes this channel popular in teaching android application programming.

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    Common Mistake #: Developing For Your Android Device

    Unless you are building a kiosk/promo app for a single tablet, chances are your Android app wont look good on every device. Here are a few Android programming tips to remember:

    There are literally thousands of possible scenarios, but after a while you develop a sense for covering them all with a handful of cases.

    You dont own thousands of devices? Not a problem. The Android Emulator is super good in replicating physical devices. Even better, try out Genymotion, its lightning fast and comes with a lot of different popular preset devices.

    Also, have you tried rotating your device? All hell can break loose

    Java Vs Kotlin For Android App Development

    40 Android application development tutorial for beginners ...

    One of the biggest decisions youll need to make as an Android developer is whether youre going to learn Kotlin or Java. Both languages are officially supported by Google and Android Studio, but they have some distinct differences.

    Java has been supported by Google the longest and is what developers have been using to craft Android apps for years. Java is also one of the most in-demand programming languages in the world, which makes it a great choice for those who want to begin a career in development. As the oldest Android programming language, there is also slightly more support for Java vs Kotlin, although its not by much.

    Kotlin, on the other hand, has become Googles preferred choice for Android development. This is the default when starting a new app, and it is likely to become more common going forward. Kotlin is also significantly easier to get to grips with if youre a complete beginner.

    For these reasons, Kotlin is probably the language of choice for Android developers that are learning for fun, or that have no aspirations to develop for other platforms. However, Java makes more sense if youre interested in becoming a professional developer.

    You can learn more about the two options here by reading our guide to Kotlin vs Java for Android.

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    Adding A Menu To Your App

    Now that you configured the Auth0 library, the next thing you will do is to add a menu for your app. This will be a dynamic menu that will allow users to either log in or log out .

    To start defining this menu, create a new directory called menu inside ./app/src/main/res/. Then, create a file called menu.xml inside menu and add the following code to it:

    This menu is quite simple. It contains a single item just with an id and an empty title. You will define the title of the menu, along with its behavior, programmatically.

    Now, as the menu will only cover two scenarios , you will define two menu listeners: LoginListener and LogoutListener. When your users click on the menu, your app will call one of these listeners to either start the authentication process or end the user session.

    To define the first listener, create a class called LoginListener inside the com.auth0.todo.util package and add the following code to it:

    As you can see, this class implements an interface called MenuItem.OnMenuItemClickListener. It also defines a constructor that receives an instance of a class called AuthenticationHandler. You will create this class soon. Lastly, it defines that the onMenuItemClick will trigger a method called startAuthenticationProcess. As its name suggests, this method will start the authentication process.

    After defining the login listener, you will create the LogoutListener inside the same package and add the following code to it:

    Add Text To The Ui Layout

    Now let’s add some text to our layout.

  • In the Palette pane, pick the TextView element and drag it to the canvas below the image.

    The widget displays some default text: TextView. To change it and link it to a string, we need to create a new text resource.

  • Select the textView element in the Component Tree on the left. In the Attributes pane on the right, click the Pick a Resource icon next to the text attribute:

  • In the dialog that opens, click the Add resource to the module icon in the top left corner and choose String Value.

  • In the New String Value dialog, enter the resource name and the resource value :

  • Now let’s modify the textView element id the same way we did with imageView.

    Select textView in the Component Tree on the left, and in the Attributes pane set the id to a new value: clickCounter.

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    Android Native Or Cross

    Creating Android apps requires learning one of the languages supported by the Android software development kit. Most commonly, this means Kotlin, Java, or C++. If you happen to already know a web development language, such as JavaScript, you can take a look at frameworks that let you deploy to an Android device. Weve covered some of these frameworks previously in our React Native learning and Ionic learning tutorials. These platforms also come with the benefit of being able to deploy to multiple platforms.

    But those looking to code native apps for Android through the standard toolset, read on!

    Knowledge Of The Application Components

    Android App Development Tutorial 4 – Installing Android Studio | Java

    Application components are the essential building blocks of Android app development. Each of the components is a different point by which the system can enter your app. Although each one of them exists as its own entity and plays a specific role, there are some which depend on each other, and not all of them are actual entry points.

    There are five different types of app components each serving a distinct purpose with a distinct life cycle which defines how it is created and destroyed. They include:

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    Common Mistake #: Developing For Ios

    To my great pleasure, this Android mistake is far less common nowadays . But still, every now and then, we see an app that is an iOS clone.

    Dont get me wrong, Im not an Android programming evangelist! I respect every platform that moves the mobile world a step forward. But, its 2014 and users have been using Android for quite a while now, and theyve grown accustomed to the platform. Pushing iOS design standards to them is a terrible strategy!

    Unless there is a super good reason for breaking the guidelines, dont do it.

    Here are some of the most common examples of this Android mistake:

  • You should not be making static tabs, and they dont belong on the bottom .
  • System notification icons should not have color.
  • App icons should not be placed inside a rounded rectangle .
  • Splash screens are redundant beyond the initial setup/introduction. Do not use them in other scenarios.
  • Lists should not have carets.
  • These are just a few of the many other small things that can ruin the user experience.

    What Is Android Studio

    Android Studio is the official Integrated Development Environment for Android app development, based on IntelliJIDEA. On top of IntelliJs powerful code editor and developer tools, Android Studio offers even more features that enhance your productivity when building Android apps, such as:

    • A flexible Gradle-based build system
    • A fast and feature-rich emulator
    • A unified environment where you can develop for all Android devices
    • Apply Changes to push code and resource changes to your running app without restarting your app
    • Code templates and GitHub integration to help you build common app features and import sample code
    • Extensive testing tools and frameworks
    • Lint tools to catch performance, usability, version compatibility, and other problems
    • C++ and NDK support
    • Built-in support for , making it easy to integrate Messaging and App Engine

    Now that you know what is Android Studio, lets move further and see how to set up and configure Android Studio on your system to develop Android App.

    Setting up Android Studio

    One of the most convenient factors about Android Studio is that you can start developing Android applications on any of the operating systems. It can be Microsoft Windows, Mac OS or Linux.

    Now to start off with the implementation part, we need to install the following softwares:

  • JDK Java Development Kit

  • Android Studio

  • 1. JDK Installation

    Once you configure JDK, you can go ahead with the Android Installation.

    2. Android Studio

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