How to make an Android appby Xozepew Usaz We are always in the lead! The Android platform is open source, so anyone can write their own application and distribute it through program catalogs. All tools are free.
The programming language for mobile development on Android is very simple - Java. Google is now actively promoting Kotlin as a language that can replace Java. Applications are also written in C ++.
The creation of a simple application consists of several stages:
project in Android Studio;
creating a user interface;
adding activities, navigation and actions;
test drive the application in the emulator.
The first step is to install the Android Studio program. This is the official development environment (IDE) for Android and runs on Windows, macOS and Linux. Although you can use other environments besides Android Studio when developing programs for Android.
If the Android SDK and other components are not installed on your computer, Android Studio will automatically download them. The Android SDK is a programming environment that includes libraries, executables, scripts, documentation, etc.
The Android SDK compiles the code along with any data and resources into an .apk file. It contains everything you need to install an application on an Android device.
When all the tools are installed, you can create your first project. But first, you need to understand the basic concepts.
What the application consists of
An Android application has four components. Each component is an entry point through which a system or user can access.
Activity - elements of an interactive user interface.
One activity engages another and passes information about what the user intends to do through the Intent class. Activities are like web pages, and intents are like links between them. Application launch is the Main activity.
Service is a universal entry point for keeping the application running in the background.
This component performs time consuming operations or work for remote processes without a visual interface.
A broadcast receiver broadcasts intents from an application to multiple participants.
A content provider manages a common set of application data from the file system, SQLite database, internet, or other storage.
Building an Android app
in Android Studio
Select the application name, company domain, project path and package name. We indicate whether to enable support for the optional programming languages C ++ and Kotlin.
We set one or more target platforms for the build. It uses SDK and AVD, Android virtual device manager. The tool allows you to install packages into the SDK that support multiple Android OS versions and multiple API levels (Application Programming Interfaces).
Select the main activity that will be launched when you click on the application icon, and give it a name.
After a few minutes of building, Android Studio opens the IDE interface. There are three main points here.
If you select Android view from the drop-down menu, you will see the project files. For example, our main activity is named app> java> ru.skillbox.skillboxapp> FullscreenActivity. When creating the project, we specified a full-screen activity instead of the Main activity.
Next, you can see the file app> res> layout> activity_fullscreen.xml. This is an XML layout file for the UI of our main activity.
Finally, the third important file app> manifests> AndroidManifest.xml describes the fundamental characteristics of the application and defines all its components.
Run on a real device
The application we created is one activity that runs in full screen mode and has no graphical elements.
We run it on an Android device or in an emulator.
For this, a smartphone or tablet is connected in USB debugging mode, which is activated in the Developer Settings in the Settings menu.
To run in the emulator, press the Run button in the Run menu (Shift + F10) in Android Studio. We select the appropriate device and OS version, portrait or landscape (landscape) orientation.
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Building a simple user interface
The user interface of an Android application is built through a hierarchy of layouts (layouts, ViewGroup objects) and widgets (View objects). Layouts control the layout of child widgets on the screen. The widgets themselves are directly UI components: buttons, text fields on the screen, etc.
The activity interface is created in Android Studio in the Layout Editor and is stored mostly in XML files.
Created on Feb 23rd 2021 03:26. Viewed 577 times.
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