Android Studio For Java Development

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Why Is Java Secure

Android App Development Tutorial 4 – Installing Android Studio | Java

Lets take this bubble idea a bit further. Because Java applications run within the bubble that is a virtual machine, they are isolated from the underlying device hardware. Therefore, a virtual machine can encapsulate, contain, and manage code execution in a safe manner compared to languages that operate in machine code directly. The Android platform takes things a step further. Each Android application runs on the operating system using a different user account and in its own instance of the Dalvik VM. Android applications are closely monitored by the operating system and shut down if they dont play nice . Therefore, its important to develop applications that are stable and responsive. Applications can communicate with one another using well-defined protocols.

Cache The Textview For Repeated Use

You could call findViewById in countMe to find showCountTextView. However, countMe is called every time the button is clicked, and findViewById is a relatively time consuming method to call. So it is better to find the view once and cache it.

  • In the FirstFragment class before any methods, add a member variable for showCountTextView of type TextView.
  • TextView showCountTextView 
  • In onCreateView, you will call findViewById to get the TextView that shows the count. The findViewById method must be called on a View where the search for the requested ID should start, so assign the layout view that is currently returned to a new variable, fragmentFirstLayout, instead.
  • // Inflate the layout for this fragmentView fragmentFirstLayout = inflater.inflate 
       ...    // Get the count text view    showCountTextView = fragmentFirstLayout.findViewById 
  • Return fragmentFirstLayout from onCreateView.
  • return fragmentFirstLayout 

    Here is the whole method and the declaration of showCountTextView:

  • Run your app. Press the Count button and watch the count update.
  • Is This The End Of Java

    There are mixed opinions from developers.

    Java is a reputable programming language with vast open-source tools and libraries to help developers. With that said, no language is without fault and even Java is subject to complications that can make a developers job tedious. If anything, Kotlin will introduce solutions to common programming headaches and improve the Java ecosystem as a whole.

    In two years, Kotlin has become a more stable and congruous development option for Android Studio. Some developers seem to believe that Kotlin will oust Java for Android development in the coming years. Other experts see Kotlin and Java coexisting without one outweighing the other.

    For most, Kotlins strengths outweigh the languages setbacks. There are definite limitations within Java that impede Android API design. Kotlin is inherently lightweight, clean and far less verbose, especially in terms of writing callbacks, data classes, and getters/setters. In other words, Kotlin is specifically designed to improve existing Java models by offering solutions to API design deficiencies.

    Kotlin addresses a number of Javas weaknesses:

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    About The Android App Development Specialization

    This Specialization enables learners to successfully apply core Java programming languages features & software patterns needed to develop maintainable mobile apps comprised of core Android components, as well as fundamental Java I/O & persistence mechanisms.

    The Capstone project will integrate the material from throughout the Specialization to exercise and assess the ability of learners to create an interesting Android app by applying knowledge and skills learned in previous MOOCs, including Java programming features, Android Studio tools, Android Activity components, Material Design, file I/O and data persistence, unit testing, and software patterns. The project itself will be similar in design goals to previous assignments, however it will provide less of the skeleton code than earlier MOOCs provide to enable more creativity to learners and greater opportunity for learners to customize the app.

    Why Is Platform Independence Important

    Android Studio : Basic App Development (JAVA, Windows

    With many programming languages, you need to use a compiler to reduce your code down into machine language that the device can understand. While this is well and good, different devices use different machine languages. This means that you might need to compile your applications for each different device or machine languagein other words, your code isnt very portable. This is not the case with Java. The Java compilers convert your code from human readable Java source files to something called bytecode in the Java world. These are interpreted by a Java Virtual Machine, which operates much like a physical CPU might operate on machine code, to actually execute the compiled code. Although it might seem like this is inefficient, much effort has been put into making this process very fast and efficient. These efforts have paid off in that Java performance in generally second only to C/C++ in common language performance comparisons.

    Android applications run in a special virtual machine called the Dalvik VM. While the details of this VM are unimportant to the average developer, it can be helpful to think of the Dalvik VM as a bubble in which your Android application runs, allowing you to not have to worry about whether the device is a Motorola Droid, an HTC Evo, or the latest toaster running Android. You dont care so long as the device is Dalvik VM friendlyand thats the device manufacturers job to implement, not yours.

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    Java Vs Kotlin: Which Is Better For Android App Development

    Both languages are fantastic and offer a range of benefits that would make them excellent choices to use in developing leading mobile applications. However, if youre looking more specifically at Java vs Kotlin, then there are certain types of apps where one might be better than the other.

    Java is better for:

    • Large applications with lots of features and functionality that need to function across all platforms, including Android, iOS, Windows, or Linux. Java has mature libraries that support this type of application development well.

    Kotlin is better for:

    • Apps where performance matters a lot, such as those that need to run smoothly on older Android phones or ones that are used for photo editing. Kotlin has a more streamlined and efficient design than Java, so it will perform better in these types of situations, especially when scaling is concerned.
    • Apps that need to maintain platform independence and be cross-compiled for multiple platforms as well as Android. Kotlin can perform these functions while Java cannot due to its use of bytecode which can only compile code for one specific platform at once.

    Tutorial: Create Your First Android Application

    In this tutorial, we will create a simple yet fully-functional Android application that counts how many times you tap a droid image. After that, we will run it on an Android virtual device.

    This tutorial covers a simple scenario to help you get started with Android development in IntelliJ IDEA. For comprehensive how-to guides and reference documentation, visit the Android Studio user guide.

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    Choose Resources To Make Public

    All resources in a library default to public. To make all resourcesimplicitly private, you must define at least one specific attribute as public.Resources include all files in your projects res/ directory, suchas images. To prevent users of your library from accessing resources intendedonly for internal use, you should use this automatic private designationmechanism by declaring one or more public resources. Alternately, you can makeall resources private by adding an empty < public /> tag , whichmarks nothing as public, which makes everything else private.

    To declare a public resource, add a < public> declaration to your libraryspublic.xml file. If you havent added public resources before, you need to create thepublic.xml file in the res/values/ directory of your library.

    The following example code creates two public string resources with the namesmylib_app_name and mylib_public_string:

    < resources> < public name="mylib_app_name" type="string"/> < public name="mylib_public_string" type="string"/> < /resources> 

    You should make public any resources that you want to remain visible to developers using your library.

    Implicitly making attributes private not only prevents users of your libraryfrom experiencing code completion suggestions from internal library resourcesbut also allows you to rename or remove private resources without breakingclients of your library. Private resources are filtered out of code completion,and Lint warns you when you try toreference a private resource.

    Update The Textview To Display The Header

    #3 Android Studio Overview – Android Development Tutorial 2020 in Java
  • In fragment_second.xml, select textview_second, which currently has the text “Hello second fragment. Arg: %1$s” in the hello_second_fragment string resource.
  • If android:text isn’t set, set it to the hello_second_fragment string resource.
  • Change the id to textview_header in the Attributes panel.
  • Set the width to match_constraint, but set the height to wrap_content, so the height will change as needed to match the height of the content.
  • Set top, left and right margins to 24dp. Left and right margins may also be referred to as “start” and “end” to support localization for right to left languages.
  • Remove any bottom constraint.
  • In strings.xml, change hello_second_fragment to “Here is a random number between 0 and %d.”
  • Use Refactor > Rename… to change the name of hello_second_fragment to random_heading.
  • Here is the XML code for the TextView that displays the heading:

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    Release Channels And Updates

    Chrome OS uses the same release system as Google Chrome: there are three distinct channels: Stable, Beta, and Developer preview . The stable channel is updated with features and fixes that have been thoroughly tested in the Beta channel, and the Beta channel is updated approximately once a month with stable and complete features from the Developer channel. New ideas get tested in the Developer channel, which can be very unstable at times. A fourth channel was confirmed to exist by Google Developer Francois Beaufort and hacker Kenny Strawn, by entering the Chrome OS shell in developer mode, typing the command shell to access the bash shell, and finally entering the command update_engine_client -channel canary-channel -update. It is possible to return to the verified boot mode after entering the canary channel, but the channel updater disappears and the only way to return to another channel is using the “powerwash” factory reset.

    Updating The Android Sdk Target Api

    Unity Hub installs the latest version of the Android SDK Target API required by Google Play.

    If you need to use a more recent version, you can change the Target API from the Target API Level field in the Player Settings window . You can find the Target API Level option in the Other Settings > Identification section.

    After you select an option other than the default, Unity prompts you to update the Android SDK API. You can choose to either:

    • Update the Android SDK
    • Continue to use the highest installed version of the Android SDK

    Note: If you select an older version of the Target API, the Unity Android SDK Updater will not be able to perform the update and will give you this message:

    Android SDK does not include your Target SDK of . Please use the Android SDK Manager to install your target SDK version. Restart Unity after SDK installation for the changes to take effect.

    In this case, to update the Android SDK Target API, you must use the Android sdkmanager from either Android Studio or the command line tool. Regardless of the method you chose, make sure to select the correct Android SDK folder for Unity in the Edit > Preferences > External Tools window.

    On Windows, if the Unity Editor is installed in the default folder , you must run the sdkmanager with elevated privilege to perform the update.

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    Operators And Operator Overloading

    Operators that cannot be overloaded

    Operator

    C++ provides more than 35 operators, covering basic arithmetic, bit manipulation, indirection, comparisons, logical operations and others. Almost all operators can be for user-defined types, with a few notable exceptions such as member access as well as the conditional operator. The rich set of overloadable operators is central to making user-defined types in C++ seem like built-in types.

    Overloadable operators are also an essential part of many advanced C++ programming techniques, such as . Overloading an operator does not change the precedence of calculations involving the operator, nor does it change the number of operands that the operator uses . Overloaded “& & ” and “||” operators lose their property.

    enables one common interface for many implementations, and for objects to act differently under different circumstances.

    C++ supports several kinds of static and dynamic ” rel=”nofollow”> run-time) , supported by the language features described above. does not allow for certain run-time decisions, while typically incurs a performance penalty.

    Variable pointers and references to a base class type in C++ can also refer to objects of any derived classes of that type. This allows arrays and other kinds of containers to hold pointers to objects of differing types . This enables dynamic polymorphism, where the referred objects can behave differently, depending on their types.

    Virtual member functions
    -> return_type

    Make The Count Button Update The Number On The Screen

    Top Java Ide For Mac

    The method that shows the toast is very simple it does not interact with any other views in the layout. In the next step, you add behavior to your layout to find and update other views.

    Update the Count button so that when it is pressed, the number on the screen increases by 1.

  • In the fragment_first.xml layout file, notice the id for the TextView:
  • In FirstFragment.java, add a click listener for the count_button below the other click listeners in onViewCreated. Because it has a little more work to do, have it call a new method, countMe.
  • view.findViewById.setOnClickListener }) 
  • In the FirstFragment class, add the method countMe that takes a single View argument. This method will be invoked when the Count button is clicked and the click listener called.
  • private void countMe 
  • Get the value of the showCountTextView. You will define that in the next step.
  •    ...    // Get the value of the text view    String countString = showCountTextView.getText.toString 
  • Convert the value to a number, and increment it.
  •    ...    // Convert value to a number and increment it    Integer count = Integer.parseInt     count++ 
  • Display the new value in the TextView by programmatically setting the text property of the TextView.
  •    ...   // Display the new value in the text view.   showCountTextView.setText) 

    Here is the whole method:

    private void countMe 

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    More About Android Studio

    • Build variants and multiple APK generation.
    • Expanded template support for Google Services and various device types.
    • Rich layout editor with support for theme editing.
    • Lint tools to catch performance, usability, version compatibility, and other problems.
    • ProGuard and app-signing capabilities.
    • Built-in support for Google Cloud Platform, making it easy to integrate Google Cloud Messaging and App Engine.

    For more details about features available in Android Studio,read the overview at Android Studio.

    If you have been using Eclipse with ADT, be aware that Android Studio is now the official IDEfor Android, so you should migrate to Android Studio to receive all thelatest IDE updates. For help moving projects,see Migrating to AndroidStudio.

    Kotlin 201: Where Is The Language Now

    Since Google I/O 2017, Kotlin has seen explosive growth in Android development and after hosting KotlinConf only twice, the conference has become something of an institution in the developer community.

    Accessibility on all platforms has always been a primary objective for Kotlin, but multi-platform programming is only the premise to a much more innovative outlook: sharing code between all platforms. With the release of Kotlin 1.3, improvements to Kotlin/Native are advancing the concept of multi-platform convenience. Finally, Android developers can use one integrated development environment to develop with Kotlin on all platforms. The newest release makes mobile app scalability more attainable by supporting the invaluable benefit of code reuse, saving time and effort for more challenging tasks.

    Kotlin/Native uses the compiler technology LLMV to compile Kotlin sources into stand-alone binaries for multiple operating systems and CPU architectures like iOS, Linux, Windows, Mac, and Webassembly.

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    Android Project Topic List For Final Year Students

    1. Bike Car Service

    Android Project Idea: This project aims at providing ease of servicing for the vehicles that include both car and bike. The vehicle owners, at times, do not get time for servicing their vehicles thus this application will help them schedule a day and time for the servicing of their vehicles. In this, the user can find the service center and its location.

    To develop this application, Android Studio would be required. It will have a login page, appointment details part, and also location pick up and drop locations for the users. There will be Servicing details, Emailing system, and details of the service center.

    There will be two modules that are the Admin and the user. The Admin can manipulate the service details, view them, manage booking, and also generate reports. The users can register themselves, login, view their profiles, and give feedback as well.

    2. Gram panchayat services

    Android Project Idea: This is one of the best android projects for final year students. Gram panchayat services app is built to make the members of panchayat available for the citizens. This will make it easy for the citizens to place the complaints and get the solutions in time. They can also know about the upcoming projects and the programs without delay.

    3. Toll Gate Application

    This application would be made using Android Studio IDE. And Java programming and XML for the functioning and interface of the application.

    4. eCommerce for women

    5. Gym Management app

    Get Your Ui Ready For The Next Task

    #1 How to Install Android Studio – Android Development Tutorial 2020 in Java

    The next task is to make the buttons do something when they are pressed. First, you need to get the UI ready.

  • Change the text of the TextView to show 0 .
  • Change the id of the last button you added, button2, to count_button in the Attributes panel in the design editor.
  • In the XML, extract the string resource to count_button_text and set the value to Count.
  • The buttons should now have the following text and ids:

    Button

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    Why Is Java Easy To Learn

    Java is easy to learn for a variety of reasons. Theres certainly no shortage of Java resources out there to help you learn the language, including websites, tutorials, books, and classes. Java is one of the most widely discussed, taught, and used programming languages on the planet. Its used for many different types of programming projects, no matter their scale, from web applications to desktop applications to mobile applications.

    If youre coming from a traditional programming background like C or C++, youll find Java syntax quite similar. If youre not, then take comfort in knowing that youve chosen one of the easiest languages to learn. Youll be up and running in no time at all.

    Finally, Java is one of the most human-readable languages out there, by which we mean that a person who knows nothing about programming can often look at some Java code and have at least an inkling what its doing. Consider the following example:

    char character = 'a' if else 

    If you simply read the code aloud, you can pretty much tell that this snippet of code is doing. Theres a single letter variable called character. If the character variable equals the letter a, then we do something method), otherwise we do something else method).

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