Application Development in the Android studio Environment

Introduction:

The article describes the problems of the creation of mobile applications.   Problems and solutions we work with developers of mobile applications are different from what we have to deal with web developers, and with the expansion of the industry have its own forums, groups, and communities in social networks, where they discuss challenges faced, and share best practices. The authors analyzed the dimension and trends of mobile development, concluded. We developed the application using Android Studio with responsive design and a hidden menu using the Java language. Currently the mobile app is under testing. Keywords: Android Studio, activity, mobile apps, mobile applications market, visual interface.

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Today, the mobile phone is becoming the source of the most diverse and necessary resources for work, leisure and education, which is facilitated by the rapid development of the mobile application industry. is also growing activity in the field of development of appropriate software . People buy goods and order services using smartphones and tablet computers. In countries, 90% of all sales are made via the Internet and the lion’s share is made up of purchases using various mobile applications. In , the mobile application market is just beginning to develop.

After analyzing the analytics and development trends of the mobile development market, conclusions are drawn :

  • More than 50% of phone users use downloaded applications and access sites via a mobile phone;
  • smartphone sales statistics indicate that the majority (about 60%) are Android devices, the remainder are iOS, Symbian and Windows Phone;
  • The dynamics of application downloads is positive, and, consequently, there is an increase in traffic and profit.

In, traffic growth in the mobile application market is from 10-15% and higher. The average number of installations of one application exceeds 15 thousand. The number of active users of mobile applications exceeds one million people. In, only 10 companies are engaged in the creation of mobile sites and applications.

Less time, more information and daily routine. The world is changing, and mobile applications are helping to change it. The developed ShoppingList application simplifies life and saves time. This is convenient: after all, making a shopping list through a mobile application can be done on the way to work, sitting in a car, taxi or at home. The user only needs to enter the mobile application, make a list of potential purchases. And then go about your own business. The application was developed in the AndroidStudio environment, using the Java 1.7 language extended edition.

The graphical user interface for the Android application is built using a hierarchy of View and ViewGroup objects. View objects are user interface widgets, such as buttons or text fields, and ViewGroup is a non-visual view of containers that determine the location of child views, for example, in a grid or a vertical list.Android provides an XML dictionary that corresponds to subclasses of ViewGroup, where you can define a user interface using a hierarchy of user interface elements.

In Android applications, the visual interface is often loaded from special xml files that store markup. These files are markup resources. This approach resembles the creation of websites, when the interface is defined in html files, and the application logic is defined in javascript code.Since the visual interface in the Android application is implemented through activity objects that represent a separate screen, there is a separate markup resource file for each activity object. These files are located in the project in the res / layout directory.

The Coordinator Layout element acts as the top-level container of the visual interface, which defines three areas: the top (defined by the AppBar Layout and Toolbar elements), the main part and the bottom (determined by the Floating Action Button element). The contents of the content_main.xml file are inserted as the main part using the expression: <include layout = “@ layout / content_main” />. This approach allows you to break the visual interface into parts, creating and developing them independently. In AndroidStudio, by default, the file content_main.xml is opened, which graphically – in the form of a phone image – shows how the interface will look like .

Activity (Activity) – a code in the Java language that controls the display and behavior of the application window and its elements described in the layout file (layout). This is a kind of entity that personifies everything that a user can do. Almost all instances and varieties of activites interact directly with the user, so the Activity class is responsible for creating a window in which the developer can place his visual GUI by calling setContentView (View).

When creating the application, a convenient user interface was developed with an adaptive design, a hidden menu, and uptime. Android app “ShoppingList” is currently at the testing stage . In the future, it is planned to create: automatic prompts when typing from a predefined dictionary; sending the generated list via SMS, mail or via social networks; search for the best price product from the list with cooperating stores and, therefore, working with maps to find a store route that offers the most favorable price offer; application design optimization.

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