How to use Android Studio

There are several ways to develop applications for Android, but today the official and most popular way. This is Android Studio. This is an official development environment created in Google and with the help of it have developed most of the applications that you use every day.

For the first time, Android Studio was announced at the Google I/O conference in 2013, and the first version was published in 2014. Before that, most applications were developed in Eclipse, which is a more universal environment for Java. Android Studio makes the development of applications much easier, but it still remains difficult. Beginning users need to study a lot of materials to confidently use it.

In this article we will tell you how to use Android Studio, we will talk about its basic capabilities and everything you need to start work. And all this is as simple as possible so that you can take your first step in the development for Android.

What is Android Studio?

Android Studio provides an integer for creating applications and takes on most of the complex file management. You will use Java to program applications. Despite automation, most of the features of the application you still have to encode yourself.

At the same time, Android Studio gives access to Android SDK, this is the expansion of Java, which allows the applications to work on the device and use its equipment. You can run programs for testing in an emulator or immediately on a phone connected to a computer. In addition, Android Studio gives various tips during coding, for example, emphasizes errors.

Installation and setting Android Studio

It is necessary to install JDK (Java Development Kit) and Jre (Java Runtime Environment).

Before Android SDK supported only the JDK version 6, but now it is in the past. 7 and even 8 are supported (at least, it was the 8th version that I indicated as Java_home And in the Android Studio settings, and did not experience any problems). Jre is needed to launch the studio itself. It uses it version 7 for me. Download jdk and jre versions more than 6 from Oracle website.

  • Go to Control panel \ System and Safety \ System, Select on the left Additional system parameters, In the dialogue opened, find a button Environment Variables.
  • Create a system or user variable Java_home and indicate for her the path to jdk. I have such a way: C: \ Program Files \ Java \ JDK1.eight.0_05.
  • Download java ee 6 from Oracle website.
  • Install it. The kit has JDK 6.
  • As Java_home In this case, you need to specify the path to JDK from Java EE, by default it C:/Glassfish3/JDK.

If you have Android SDK installed.

Android Studio includes its Android SDK. And, if you want to use it, then in some cases a strange. For example, when I update SDK through the SDK Manager, some files were recorded in the old folder, and there were problems when I deleted this folder. Most likely this happened due to the fact that the key was stored in the register with the path to the old folder. Therefore, it makes sense to clean the registry. To do this, you need to run regedit.exe and find HKEY_LOCAL_MACHINE \ Software \ Android SDK Tools for 32-bit cars or HKEY_LOCAL_MACHINE \ Software \ Wow6432Node \ Android SDK Tools for 64-bit cars and delete Android SDK Tools. If there are no such keys in the registry of your system, then everything is in order.

If you have a variable environment Android_sdk_home And you want it to indicate an old installation, then, in theory, this should not be a problem, since when setting up Android Studio we will indicate her path to SDK. Problems may arise if this variable uses any of the applications that are part of Android SDK.

Now proceed to installing Android Studio.

You need to download Android Studio for your system from the official page and install it. By default, if you select “install only for me” is placed in \ Users \\ Appdata \ Local \ Android \ Android-Studio \, Otherwise, it is placed in \ Program Files (x86) \ Android \ Android-Studio \. You can choose another folder.

After installation, start Android Studio.

  • We check the updates and, if necessary, are updated (for this, click on Check In the bottom of the window)
  • We go to Configure-SDK Manager (just in case: SDK Manager is not a part of Android Studio, but a utility from Android SDK) and install what you need. If you do not know what is necessary, then it is better to establish everything that he will offer.

We need to go to Configure-Settings-Apperate:

Creating a project

New Project

  • The name of the project (I left by default: My Application)
  • Company domain, by default .Example.com, in my case Markedone.Example.com
  • The name of the package can also be edited by clicking on Edit on right. By default, it is generated from the name of the project and the domain of the company and looks like COM.Example.com.Example.Markedone.MyApp.
  • The path where the project will be saved. I indicated my folder for all sorts of test projects.

Form Factors

Here I left everything by default: Phone and Tablet and 4.0.3 icecreamsandwich. If the API is not installed for some platforms, the message not insatlled is issued. For example, as can be seen in the screenshot, I have not installed libraries for Google Glass (you can do this through SDK Manager).

If you press Help Me Choose, then such an interesting dialogue will open, it contains information on the coverage of devices when choosing a particular version of the API. The rectangles of the API versions are clickable, the list of functionality available in them will be displayed on the right. For example, for the default Ice Cream Sandwich:

Add Activity

Naturally, I could not pass by Fullscreen Activity and chose it. You can choose another Activity, but in this case, the source on Java will differ, and you will have to independently add a challenge of a native method from Java (however, there is nothing complicated in this). We make a choice, click Next.

  • Activity Name. The name of the class, I left by default: Fullscreenactivity.
  • Layout Name. The name Layout, for the editor UI, also leave by default.
  • Title. By default, Fullscreenactivity is proposed, I put a gap: Fullscreen Activity.

Launch of the project

The project created above already contains some primitive functionality. True, this functionality does almost nothing, only displays the line “Hello World!”. Nevertheless, this is actually an application that we can launch.

To launch and test the application, we can use emulators or real devices. But ideally it is better to test on real devices. In addition, emulators require large hardware resources, and not every computer can pull the requirements of emulators. And to use a mobile device for testing, it may be necessary to install the necessary driver.

Developer mode on the phone

By default, the options for the developer on smartphones are hidden. To make them accessible, you need to go to Settings ABOUT PHONE (phone settings) (in Android 8 this is in Settings System ABOUT PHONE (settings about the phone system)) and press Build Number seven times (assembly number).

Now you need to turn on USB debugging. To do this, go to Settings System Advanced Developer Options or Settings System Additionally for Developers (in Android 8 this is in the Settings System Developer Options or Settings system for developers).

Launch of the application

We will connect the device with Android OS (if we test on the real device) and start the project by clicking on a green arrow on the toolbar.

Choose the device and press the OK button. And after launch, we will see our application on the device screen:

Android Studio how to run the application on the phone

So, after a languid installation of the Android Studio development environment, it’s time to start the program and create your first application. At the first launch of Android Studio, we observe a window in front of us, in which the program offers us to choose one of the options:

Throughout the training, we will be mostly interested in the first 2 points, that is, the creation of projects and the discovery of existing.

Click “Start a New Android Project”. Next, we are invited to enter the name of the project, the company’s company (we write together Home Company :)), as well as choose a place where the project files will be placed (I recommend creating the shortest way, without using the Cyrillic characters, for example, C: \ Andriod):

For us now, neither the name of the project, nor the company, but for developers selling their applications, is very important, especially those who want to spread them to Play Market-e. But we are not up to this now, enter everything you wish.

We click Next, then you need to choose from the proposed options, for which we plan to write the application, as well as the minimum version of Android, which will open our application:

For example, I chose programming on the phone/tablet with the minimum version of the installed Android 2.3. There you can also see a hint from Google, which states that with this choice our application will open by a larger number of devices, but with lower functionality and that at the moment, with such settings, our application will be open by approximately 99.3% of all devices using Google Play Mark et.

Click further (Next), before us there is a window in which it is proposed to choose a template template for the future application. AC Tivity. This is a screen, a type of user integration that can be different from the specifics of the application (for example, the application is focused on working with cards. Google Maps Activity, games or full.screen applications without unnecessary panels. Fullscreen Activity, and T.P.).

For educational purposes and in general in most cases, the Blank Activity template is suitable for many applications, which we will choose.

When you press the Next button, the difficult time throws us to the next stage of the test, where we have to appropriate the names of the main components of the application:

Activity Name. The name of the main activity, then you can create others with the strength of the need;

Layout Name. The name of the marking file that sets the appearance of the activity window is the XML file;

Title. the name of our future application;

Menu Resours Name. The name XML file, which describes the application menu button.

I advise you to leave everything as it is, unless you can write a name in Title, for example “Hellow”. Click on the finish button. If you don’t have a very powerful computer, you will have to wait a bit while the project is created.

And now, waited! The project has been created. I will not give the screenshot of the working window Android Studio, here it has already happened too many large screenshots, I am sure what you see is similar to what I would like to see now. At first, your eyes run up, but further, with experience, you will be very easy to navigate in the program. Consider the main points.

On the left you can observe our project itself and where it consists of:

As you can see, the application has 3 main components: manifests, java and res. Manifests tab contains a file named Androidmanifest.XML, the key elements of the program and their functionality are recorded in this file. For example, if we create an application from 2 activities, then the 1st will be in the default manifesto, but the 2nd must be registered there. If we make an application for working with the Internet, then in the manifest file you need to declare permission to use the Internet for this application:

The Java section stores the application file (Mainactivity in our case), which, as already mentioned, describes the type of user integration of the future application. This file will take place all the main work to create an application.

The Res section stores various resources with which the application works and contains folders: Drawable, Layout, Menu, Values.

Drawable. Contains graphic files, images.

Layout. Here is a marking file that stores the appearance of the appearance of the application (the presence and position of the buttons, text fields, switches, etc.D.).

Menu. Contains the XML file, which describes the content of the application menu buttons (click on the menu button in the program. A list of functions for selection is dumped, this list is formed in the Menu_main file.XML, which is in this folder).

Value. contains various resources, such as styles, flowers, string resources, etc.D.

The contents of these folders can (and we must) edit, later we will do it, but so far we will not touch anything in our example.

Next, we have a panel for working with the program integral:

Here we can create program elements: buttons, switches, configure colors, background, in short, all kinds of work with an integration. Pay attention to a red circle highlighted: 2 these buttons allow you to switch between Design and Text modes. In Design mode, we configure the appearance visually, dragging the necessary elements from the panel, and in the Text mode we do all this programmatically, using code programming. Each of the modes has its own advantages, but even the most inexperienced programmers need, as a rule, to work in both modes.

Android Studio how to run the application on the phone

The Android Studio setting lesson shows the main steps to create an Android emulator for testing created applications. The use of the emulator, of course, is quite convenient, but only if you have a fairly powerful computer and loading the emulator, as well as its work, do not break a lot of time. But not everyone is lucky to have such monsters, so in this article I will talk about a rather suitable way to test my work in Android Studio using a real connected device.

This article is suitable for you in 2 main cases:

1) your computer is not powerful enough to quickly operate the emulator (whether in Android Studio or Eclipce);

2) You have a senior Android Smartphone and you do not know where to put it (to give/throw it a pity).

It is also worth noting that this method can be useful to owners of productive computers, because testing on the emulator. This is one, but to observe the application of the application on a real smartphone. completely different.

So, in order to connect the smartphone to Android Studio, first of all, you need to install the desired set of drivers. As a rule, torment with a standard set of drivers will often not lead to anything, so I recommend that you immediately download this file (do not be afraid. This is not a virus, even though the antivirus curses) and, having previously deleted the old drivers, install this file (it is better not to connect the phone during installation).

After installing the drivers, connect your device to a computer to a USB. All the necessary settings will be launched and automatically installed.

Next, start Android Studio. We go to Tools. Android and put a box opposite the line “Enable Adb Integration” (Adb. Android Debug Bridge). After that, you need to configure Android Studio so that when clicking on the green button “Run” your application is immediately installed and launched on the connected smartphone. We go to Run. EDIT Configurations. The following window appears:

And in the “Target Device” unit, put a checkmark on the “USB Device” item and click OK.

Everything, congratulations, if you did everything right, the drivers have determined your device, then when clicking on the button for launching the application (highlighted in red):

the application is installed and start on the connected device.

After that, you can only pick up the connected device and test your programmatic work.

It is worth noting that if the application has been installed, but did not automatically start, then most likely it means that somewhere in the application there is an error (although it may not be highlighted in Android Studio, for example, an important piece of code is simply missed).

What is ADB

Android Debug Bridge (ADB) is a universal command line tool that contributes to the interaction between the development environment, in our case Android Studio, and AVD emulators or physical Android devices for the possibility of launching and debugging applications.

ADB consists of a client, of a server that works as a background process, on a developer’s computer and a demon that works as a background process on each instance of an emulator or a real device.

Setting up android devices for working with ADB

In order to use the ADB with a device connected via USB, it is necessary to allow USB control in the system settings of the phone or tablet in the section “Developer Parameters” (the name may differ). On some devices, this section is hidden by default. Consider the steps in the case when there is no desired section section.

  • Go to the settings, section “On the device”
  • Find the point “assembly number” and click on it 7 times. A window should appear that is activated that the developer’s regime is activated. Now in the settings the section of the developer parameters should appear.
  • Include in it the option “USB debugging”.

Now that you connect the device to the computer, depending on the model you may have a new connection option.

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Android Studio. a special development environment for Android. Based on Intellij IDEA, so the user integer is very similar.

It is installed in a standard way for each of the supported operating systems (Windows, Linux, MacOS). Instructions can be found here: https: // Developer.Android.COM/Studio/Install.

To create a new project, the following steps must be performed:

Run Android Studio. “Start a New Android Studio Project”. Choose Your Project. Empty Activity. Next.

Configure Your Project. NAME: Dice Roller Package: Com.Example.Android.Diceroller Project Location: the path to the catalog with the project in the Language file system: Kotlin Minimum API: the minimum level of API (Android version). Finish

The project of the new application has been created. To start it, you must either connect a real Android device or install and run the emulator.

To install the emulator, you must take the following steps as part of Android Studio:

Tools. AVD Manager. Create Virtual Device. Choose a Device Definition. Pixel. Next. Select a System Image. Pie. Next. Verify Configuration. AVD NAME. Pixel2-API28. Finish.

The emulator is created. You can run it by clicking on the “Run” button in the AVD Manager window.

To connect a real device, you need:

  • Turn on USB debugging:
  • Turn on the developer mode: Settings. About the phone. Assembly number (press 5 times). Steps may vary depending on the device model and Android version. In the settings, the item “For the Developer” will appear.
  • Go to the “For Developers” settings section and enable “USB debugging”.
  • Connect the device to the computer via cable.
  • Confirm the permit for debugging by USB on the device.

Launching an application on an emulator and device

To start the application, you must first select the device (to the left of the “Run” button), on which the launch will be made, and then press the “Run” button.

We will study the structure of the application project. The “Project” tab in the panel displays the structure of the project. The “Android” mode does not display the real structure of the project, but it is convenient for development. The “Project” mode displays the real structure of the project in the file system.

Consider the structure of the project in the “Android” mode. At the upper level, the project displays its modules and a list of Gradle scripts. The project may contain more than one module, but by defending it has at least one App with the source code of the application. Gradle scripts are project assembly scripts that describe the assembly stages, dependences and other information necessary for assembling the project. About them later.

  • manifests. contains the Androidmanifest application manifesto file.XML ,
  • Java. contains the source code of the application in Java or Kotlin,
  • Res. contains application resources, such as images, icons, translated lines, setting files, etc.

Manifest Androidmanifest.XML is located in the root catalog of the project. It contains important information about the application that is required by the Android system to perform any application code. Among other things, the manifesto file performs the following:

  • Sets the name of the package for the application. The packet name serves as its unique identifier in the Android system and in the Google Play store.
  • Describes various components of the application: activity (Activities), Services (Services), Content Providers, etc. Based on these descriptions, the Android system can determine what components the application consists of and under what conditions they can be used.
  • Announces what permits the application can request from the user so that the application can access the system secure API. For example, these can be permits for reading contacts, the current location of the user, or access to the file system.
  • Announces the minimum level of the API (version) Android, which is required by the application.

Java section (or catalog) contains the source code of the application. When creating a new project with empty activity, only one source code file is created. the Mainactivity class. containing a single.screen application code. Mainactivity class contains only one overtime oncreate method. inherited from the class Appsompatactivity.

SetContentView call as clear from the name of the method, sets content to display on the screen for this activity. As a parameter, a reference to the resource with a description of the screen marking is transmitted to the method: Activity_Main.XML.

Resources with screens markings are located in the Layout catalog. These can be resources with not only screens, but any other UI elements. In addition, images, launch icons (MIPMAP), color definitions (Values/Colors) may contain images among the resources.XML), translated lines (Values/Strings.XML), definitions of topics and styles of application elements (Values/Styles.XML).

The Gradle Scree list contains Gradle Build configuration files.Gradle. One file belongs to the entire project and describes the configuration of the assembly of the project: addiction repositories, the task of cleaning the project. The second file belongs to the App Module and describes the configuration of the assembly of a particular module: a description of the parameters of the Android system, depending on the libraries. If the project contains more than one module, then it contains more Gradle files-one by one for each module.

As a simplest example, we will create the Dice Roller application, which will have one single screen with the image of a playing cube and a button to simulate a throw.

The workpiece for the application has already been created. Next is necessary:

Using the debugger Android Studio to the maximum

This is the trick that I recently learned about the Senior Android developer in my company, and now I feel unhappy, regretting the time that I spent in anticipation of the Gradle assembly to check my changes when writing Android applications.

Here is a typical scenario that every Android developer could find at least once during his life development cycle. You have a list of elements that you want to show in ListView or RecyCleView.

Below is our beloved onbindViewholder method. which connects your model with your View Components RecyCleView.

Now, let’s say, you wanted to change the color of the text for each third element in the list. Thus, the code will look something like this:

Then you will click Run and wait for the assembly and see your changes, so?

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Now you would think whether there is another way to achieve the same goal?

Your way out, Android Studio! Yes, we do not need an external plugin or tool to achieve the aforementioned task and, moreover, we don’t even have to re.collect the project. You have not rusted, we will do without Gradle 🙂 That’s how!

Step 1. it is necessary to determine the configuration of the launch

Such a launch configuration will allow us to launch our application and attach to it a debugger from Android Studio, and you can attach it to an already advanced process.

Press Run → Edit Configurations.

In the upper left corner of the dialog box, click the “” icon and select Android App.

Now give him a name, I like to call him RUN-OLY, but you can call him as you like.

Select the module that contains the code of your application, in the screenshot below, it is called App.

In the Installation Options section, select Nothing; In Launch Options, select Default Activity; In the Before Launch section, delete Gradle-Aware Make.

Thus, the configuration should look as follows:

Now you can apply and save this configuration. Now it should be selected automatically. If not, then just select it from the list.

Now put Breakpoint closer to the line you want to check. In our case, we will place it where we set the text.

Click the right mouse button on Breakpoint and remove the Suspend flag (rus. suspend).

As soon as you remove the flag, the dialogue will expand and show more options.

We are interested in the Evaluate and log section. We will write an expression there to check the changes in our element RecyCleView. Click on a small blue icon to the right of the Evaluate and Log input window to deploy it to a larger editor, and add the expression for testing, and press OK, and then Done.

Now click the Debug icon with the selected Run-OLY configuration and look at this magic.

The application should start with your Activity by default, and you should see the changes made there. Also, if you pay close attention to IDE, at the very bottom you will see only one launched task: Launching Activity.

Physical device

As you can see, everything works and the virtual pixel appeared in the list of devices (and my laptop began to make strange sounds).

It can already be launched! Lure the Play button (the triangle is so white) and wait until everything is loaded.

And the window selection window opens for emulation

After installing the drivers, connect your device to a computer to a USB. All the necessary settings will be launched and automatically installed.

Как начать пользоваться ADB Android “для чайников”

This article is suitable for you in 2 main cases:

The Android Studio setting lesson shows the main steps to create an Android emulator for testing created applications. The use of the emulator, of course, is quite convenient, but only if you have a fairly powerful computer and loading the emulator, as well as its work, do not break a lot of time. But not everyone is lucky to have such monsters, so in this article I will talk about a rather suitable way to test my work in Android Studio using a real connected device.

It is also worth noting that this method can be useful to owners of productive computers, because testing on an emulator is one thing, and to observe the application of the application on a real smartphone is completely different.

the application is installed and start on the connected device.

2) You have a senior Android Smartphone and you do not know where to put it (to give/throw it a pity).

So, in order to connect the smartphone to Android Studio, first of all, you need to install the desired set of drivers. As a rule, torment with a standard set of drivers will often not lead to anything, so I recommend that you immediately download this file (do not be afraid. this is not a virus, even though the antivirus and curses) and, having previously deleted the old drivers, install this file (during the installation, the phone better not to connect).

Next, we are waiting for the update of the project files (“Build Building”):

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Run the application to Android Studio: for this you need to click on the green icon “RUN” in the toolbar and select any emulator.

Accordingly, with each change in the application code in Android Studio, you will have to delete the application on the smartphone and re-throw the changed App-Debug file.APK from the project folder on a smartphone and install it.

T.e. For example in Build.Gradle instead of RunProguard False you need to write minifyenabled True

OS X:Установка Andoid Studio на OS X намного проще — необходимо проинсталировать JDK, а затем Android Studio.

Создам информационную тему по Android Studio.Android Studio — IDE для разработки приложений для Android от Google на основе IntelliJ IDEA.

Ошибки: 1. «You are using an old, unsupported version ofGradle. Please use version 1.Х or greater.2. Project is using an old version of the AndroidGradle plug-in. The minimum supportedversion is 0.Х.X. Решение О Android Studio

Renamed Properties in BuildTypesrunProguard = minifyEnabledzipAlign = zipAlignEnabledjniDebugBuild = jniDebuggablerenderscriptDebug = renderscriptDebuggable

Запускается эмулятор, но появляется ошибка «pixel launcher isn’t responding»

Перед первым запуском пропишите в переменную JAVA_HOME значение пути к текущей версии JDK (если не установлено, то установить JDK) — например C:Program FilesJavajdk1.7.0_21P.S. Android Studio успешно запустилось на системе без переменной JAVA_HOME, где в PATH был прописан путь к JDK.

Помощь в написании контрольных, курсовых и дипломных работ здесь.

Есть ли возможность быстро и легко настроить B4A? Или сразу перейти на Android Studio?Не люблю софт который не может сразу работать после инсталляции. Мне лень указывать javac.exe.

Почему Android Studio не сразу подхватывает изменения кода(только после переустановки APK)?Иногда после изменения кода в Android Studio (к примеру изменю вывод Log.d )и запуска его смартфоне.

(Android studio, java) Ошибка при импорте библиотеки cannot resolve symbol Android studioВот библиотека https://github.com/mik3y/USB-serial-for-Android. Устанавливал так, File. New

Android studio не видит USB-подключение телефонаЗдравствуйте. Начну с того, что вторые сутки ищу решение проблемы и не нахожу. Есть другие.

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