How To Develop Android App


Your First Android Project

How to Make an Android App for Beginners

Now that you’ve weighed down your computer with all these applications and plugins, you’re ready to get started with the actual coding. But first we need to set up the project files.

To get started, go to ‘File’, ‘New’, ‘Project’ and expand the Android tab. Select ‘Android Application Project’ and you’ll be presented with this screen:

You can use the rollover icons next to each field for tips on what each value pertains to. The most important to bear in mind is ‘Application Name’, which will form the name of the application when installed, and the ‘Minimum Required SDK’, with which you specify the earliest Android version you want to support your app. If you need a refresher on the multitudinous versions of Android, check out this guide.

An activity is effectively an action or view that the user will interact with, so a logical way to divide up your program is by activity in terms of what windows the user will see and the functionality available on each. So if, for example, you’re doing a simple “Hello World” program, you only need one activity, which will be the view showing the text, while all the interface settings are pulled down from the resource files that the SDK creates.

When you’ve decided on your activities, click ‘Finish’. Eclipse will cobble together all the files you’ll need for your app, in which you will write code and/or change settings to specify the parameters of your program.

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How Do You Create An App For Free

Mobile development typically comes with a significant investment. This is especially true if your app solves a major market need.

But if youre just getting started and want to create a free app, you can do this using BuildFires app builder platform. This no-code software lets you build your own apps for free without writing a single line of code. This is perfect for those of you who dont want to learn a new programming language and want to play around with the custom editor.

With BuildFire, you can take an app idea and turn it into reality faster than any other platform on the market. Youll also get to create iOS apps and Android apps simultaneously using a single build.

So, whats the catch? While you can make an app for free using BuildFire, you cant actually launch it without subscribing to a plan. But anyone can try the app builder for free with a 14-day trial.

Once youre signed up and ready to put your app on the market for real downloads and user feedback, you can launch your app for free using BuildFire. All of our plans include assistance with the launch. You just need to let our team know when youre ready, and well get your app published live on the Apple App Store and Google app store.

As a developer, anyone can access BuildFire.js for free as well. This means you can create a custom plugin and launch it on the BuildFire marketplace. BuildFires open-source code and SDK make this possible.

How To Build Your Own Custom Android Rom

One of the key features of Android is that it is open source. The source code for the full operating system, including the kernel, UI, libraries and key apps, is available for free. This means that anyone can build Android from source and flash it onto a compatible device. This flexibility has allowed various groups, some commercial and some hobbyist, to develop alternative distributions of Android. These are commonly referred to as custom ROMs however a better name would be custom firmware.

Since all the necessary building blocks are available, maybe you have wondered how hard it is to build your own custom ROM, your own personalized version of Android! It is indeed possible, read on to find out more.

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Change The Background Color Of The Layout

Give your new activity a different background color than the first activity:

  • In colors.xml, add a new color resource:
  • < color name="screenBackground2"> #26C6DA< /color> 
  • In the layout for the second activity, fragment_second.xml, set the background of the ConstraintLayout to the new color.
  • In the Attributes panel:

    Or in XML:

    Your app now has a completed layout for the second fragment. But if you run your app and press the Random button, it may crash. The click handler that Android Studio set up for that button needs some changes. In the next task, you will explore and fix this error.

    Effective Tools For Android App Development Using Python

    How to Learn Android App Development: A 5 Steps Guide

    Mobile app development is one of the fastest-growing tech skills nowadays, and its popularity is on the rise. Many new frameworks and software are being introduced into the scene some of them have already recognized their reign. And as every language has asserted its presence in a field, how would Python be left out.

    You can employ various other languages for android app development using Python, Java, Kotlin, C, C++, Lua, C#, Corona, JavaScript, HTML5, and many more. The Python ecosystem has a wide variety of libraries that involve nearly all characteristics of Android app development. Creating an android app with Python is a very famous approach because of its flexibility and easy-to-understand capability.

    But the biggest challenge with building an android app using Python is that the native Android and iOS software cant understand the language. Thus to bridge the gap between Native and Python applications, we need to use many frameworks and libraries. So before we talk about the process of Android app development using Python, lets find out what Python actually is?

    Table of Content

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    Apps Adapt To Different Devices

    Android allows you to provide different resources for different devices. For example, you can create different layouts for different screen sizes. The system determines which layout to use based on the screen size of the current device.

    If any of your app’s features need specific hardware, such as a camera, you can query at runtime whether the device has that hardware or not, and then disable the corresponding features if it doesn’t. You can specify that your app requires certain hardware so that Google Play won’t allow the app to be installed on devices without them.

    After you build your first app, learn more about device configurations atDevice compatibility overview.

    Where To Find Help And Support On Your Android App Building Journey

    Android is the most widely used operating system worldwide, and there are plenty of places to get help and support.

    Here are some of the best places to look while on your app building journey.

    Stack Overflow: This is a forum for developers where you can get answers to your app development questions.

    There is also a comprehensive database of Android-related problems that have already been solved. Check out the Android-related questions here.

    Official Android Documentation: Google provides a ton of material about how to create Android apps using Android Studio.

    Once you know the basics of creating an Android app, this is a great tool to help you learn new features and troubleshoot issues. Check it out here.

    Image: Austin Distel/Unsplash

    Reddit Learn Java: This is an active community of people learning Java. Its an excellent place to browse and ask questions about the programming language. Join in the conversation here.

    Reddit Android Dev: This is a large community of Android App Developers. It has plenty of advice about how to get started with building apps. Join the community here.

    GitHub Android: GitHub has plenty of Android code samples that show best practices in different aspects of Android.

    Your Local Area Developer Group: If youre looking for in-person help, many cities around the world have active Android developer groups.

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    Install And Configure The Required Development Tools

    You need to install and configure the following to use RubyMotion effectively:

    • Download RubyMotion: Follow the instructions that you find here.
    • Install Java: RubyMotion needs a Java compiler. Follow the instructions in How do I install Java? to install Java.
    • Configure a device for development: Follow the instructions in Getting started with RubyMotion for Android.
    • Install the RubyMine text editor: This is from JetBrains, i.e., the company behind the famous IDE IntelliJ IDEA. It works well with RubyMotion. You can download it from here, and follow their instructions for installation.

    Familiarize Yourself With The Files

    Creating Your First Simple Android App

    I remember the first time I tried Android app development. I loaded up Android Studio and was immediately baffled by what I saw. There are just so many different files, multiple types of code, folders, and more! This was worlds away from the single blank file I was used to working with in Python or even QBasic .

    This can be rather daunting, but heres what you need to know.

    The file that is open is or MainActivity.kt. This is the main logic file for the activity that is going to define how your app behaves. Look on the left, and youll see that this file is found in: MyApplication > app > src > main > java > com > companyname > myapplication.

    The folders used are important for Android app development, as they help Android Studio and Gradle to find everything and build it correctly . Suffice to say, you cant just rename these as you please!

    Youll notice that there is already some code on the main page. This is what we call boilerplate code, meaning that it is code that is almost identical across different app projects and that is needed to make basic functions work. Boilerplate code is what youll find yourself typing out over and over again! One of the benefits of Kotlin is that it requires less boilerplate, meaning that youll have less code on your screen if that is what you chose.

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    Run The Test Application

    Now you should be sent to a new window with lots of code on it. Ignore the daunting looking code, all we want to do is run the code. Press the green arrow button at the top of the screen to run the code. It should have the name of the android device you are using next to it. If you don’t see this. Unplug your android device from your computer and plug it back in. Once you pressed the green arrow to run the app. Wait a few seconds for it to compile. You should see a simple app running on your phone that says “Hello world”.

    Configuring Command Line Tools

    The Android SDK ships with useful command-line tools. Before they can be used, some environment variables must be set. The following instructions are for macOS and Linux. For Windows, check the documentation on setting and persisting environment variables in terminal sessions.

    In ~/.bashrc, ~/.bash_profile, or similar shell startup scripts, make the following modifications:

  • Set the ANDROID_SDK_ROOT environment variable. This path should be the Android SDK Location used in the previous section.

    $ exportANDROID_SDK_ROOT=$HOME/Library/Android/sdk


  • Add the Android SDK command-line directories to PATH. Each directory corresponds to the category of command-line tool.

    $ # avdmanager, sdkmanager

    For apksigner and zipalign, $ANDROID_SDK_ROOT/build-tools& lt version> must also be added to PATH.

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    Target Android Ios And Windows From A Single Code Base

    You can build native apps for Android, iOS, and Windows by using C# or F# . To get started, install Visual Studio, select the Mobile Development with .NET option in the installer.

    If you already have Visual Studio installed, re-run the Visual Studio Installer and select the same Mobile Development with .NET option for Xamarin .

    When you’re done, project templates appear in the New Project dialog box. The easiest way to find Xamarin templates is to just search on “Xamarin.”

    Xamarin exposes the native functionality of Android, iOS, and Windows as .NET classes and methods. This means your apps have full access to native APIs and native controls, and they’re just as responsive as apps written in the native platform languages.

    After you create a project, you’ll leverage all of the productivity features of Visual Studio. For example, you’ll use a designer to create your pages, and use IntelliSense to explore the native API’s of the mobile platforms. When you’re ready to run your app and see how it looks, you can use the Android SDK emulator and run Windows apps natively. You can also use tethered Android and Windows devices directly. For iOS projects, connect to a networked Mac and start the iOS emulator from Visual Studio, or connect to a tethered device.

    Design one set of pages that render across all devices by using Xamarin.Forms

    Learn more
    Code sharing options with .NET

    How To Develop An Android App From Scratch

    A Complete Beginner

    If you want to create a mobile app, you can, of course, think about becoming a programmer

    • You can learn how to code with Java or study the new, popular framework Flatter and learn how to design all by yourself. This way is probably not for you if you have zero coding background and need an app in the measurable future. Also, even if you manage to finish your project, it wont be as good as a professionals work.
    • To create your Android application with the help of some patterns and preset functionality on any of the popular online builders, its a good value-for-money investment to do a quick tryout, like a market test. Justdont try to compete with an MVP thats similar to dozens of mediocre solutionson the same or similar platforms as professionally native Android apps.
    • You can address an expert Android app development agency. They provide a full range of services in development, design and quality assurance. This is probably the most expensive way to get your app. Buton a highly competitive market,an individually Android app with a brilliant UI, advanced functionality and attractive design is the most effective way to stand out.
    • Find a freelancer or a team of specialists who will do all the work for you. This way is faster and cheaper but is connected to certain risks, such as timeline breakages and unpredictable program quality.

    Whichever option you choose, there are several stages that an app should go through before it can be released.

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    How To Make A Basic Android App

    If you need to make an Android app quickly for your own needs, feel free to try out some online app builders. Several of them even provide some basic functionality for free, allowing you to experience what the process of app-building is like.

    However, their functionality is strictly limited, as is the number of design templates they offer.

    Resilience Is The Key To Creating Apps

    As you may have realized from the information in this article, creating an Android app is not easy if you dont already know how to do so.

    Understanding Java will be a big help, but even then youll still have a lot to get to grips with. If you have never coded before, your journey to create an app will be even longer.

    Depending on how long you can dedicate to study, you can learn the basics of Android app creation in a few weeks and create your own app within a few months.

    Even if you have a full-time job or other commitments, by sticking at it you can learn all you need to know to get started with the app creation process in a relatively short period of time.

    The key is that you need to keep going. Coursera estimates that you can complete its Android App Development Specialization course in around five months by putting in just four hours per week. This is a manageable amount of time for many people.

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    Explore Width And Height Properties

    Now that you have a new screen background color, you will use it to explore the effects of changing the width and height properties of views.

  • In fragment_first.xml, in the Component Tree, select the ConstraintLayout.
  • In the Attributes panel, find and expand the Layout section.
  • The layout_width and layout_height properties are both set to match_parent. The ConstraintLayout is the root view of this Fragment, so the “parent” layout size is effectively the size of your screen.

    Tip: All views must have layout_width and layout_height properties.

  • Notice that the entire background of the screen uses the screenBackground color.
  • Select textview_first. Currently the layout width and height are wrap_content, which tells the view to be just big enough to enclose its content
  • Change both the layout width and layout height to match_constraint, which tells the view to be as big as whatever it’s constrained to.
  • The width and height show 0dp, and the text moves to the upper left, while the TextView expands to match the ConstraintLayout except for the button. The button and the text view are at the same level in the view hierarchy inside the constraint layout, so they share space.

  • Explore what happens if the width is match_constraint and the height is wrap_content and vice versa. You can also change the width and height of the button_first.
  • Set both the width and height of the TextView and the Button back to wrap_content.
  • Monitor The Build Process

    How to Develop Android Apps | Playing with your (MediaPlayer)

    You can view details about the build process by clicking View > Tool Windows > Build . The window displays the tasks that Gradle executes in order to build your app, as shown in figure 3.

    Figure 3. The Build output window in Android Studio

  • Build tab: Displays the tasks Gradle executes as a tree, where each node represents either a build phase or a group of task dependencies. If you receive build-time or compile-time errors, inspect the tree and select an element to read the error output, as shown in figure 4.

    Figure 4. Inspect the Build output window for error messages

  • Sync tab: Displays tasks that Gradle executes to sync with your project files. Similar to the Build tab, if you encounter a sync error, select elements in the tree to find more information about the error.
  • Restart: Performs the same action as selecting Build > Make Project by generating intermediate build files for all modules in your project.
  • Toggle view: Toggles between displaying task execution as a graphical tree and displaying more detailed text output from Gradlethis is the same output you see in the Gradle Console window on Android Studio 3.0 and earlier.
  • If your build variants use product flavors, Gradle also invokes tasks to build those product flavors. To view the list of all available build tasks, click View > Tool Windows > Gradle .

  • Open the Settings or Preferences dialog:
  • On Windows or Linux, select File> Settings from the menu bar.
  • On Mac OSX, select Android Studio> Preferences from the menu bar.
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