Introduction of android

Android is used by most mobile users and is a hot topic in today’s technology. A Linux-based open source development area that serves as middleware and core mobile applications. This OS is designed for use on the latest smartphones, e-readers, set-top boxes, tablets and TVs. Created by the Open Handset Alliance. In this guide, you will learn the basics of Android, as well as features and categories of applications developed for Android.

History of Android

The history and versions of Android are interesting to know. Current Android codenames range from A to J. Examples include Aestro, Blender, Cupcake, Donut, Eclair, Froyo, Gingerbread, Honeycomb, Ice Cream Sandwitch, Jelly Bean, KitKat, and Lollipop. Let’s take a look at the history of Android in order.

Android Operating System

Android is a mobile operating system based on a modified version of the Linux kernel and other open source software designed primarily for touchscreen mobile devices such as smartphones and tablets. Android was developed by a partnership of developers known as the Open Handset Alliance and is commercially sponsored by Google. Introduced in November 2007, HTC Dream, the first commercial Android device, was released in September 2008.

Android Developer Tools

The Android Developer Tools allow you to create interactive and powerful applications for the Android platform. In general, musical instruments can be divided into two types.

  • SDK tools
  • platform tools

Android Architecture

The Android architecture includes various components to support all Android device requirements. The Android software includes an open source Linux kernel with a set of C/C libraries provided through application framework services.

Of all the components, the Linux kernel provides the core functions of the smartphone operating system and the Dalvik Virtual Machine (DVM) provides a platform on which to run Android applications.

OOP in Java

Object-oriented programming (OOP) is a programming paradigm that focuses on creating and organizing code around objects, which are instances of classes. Java is a widely used programming language for Android development and fully supports OOP concepts. In this overview, I will explain some fundamental concepts of OOP using Java in the context of Android programming.

  1. Classes and Objects.
  2. Encapsulation.
  3. Inheritance.
  4. Polymorphism.
  5. Abstraction.

OOPs Concepts

Object-oriented programming (OOP) is a programming paradigm widely used in Android development. It allows developers to structure their code using objects, classes, and inheritance. Here are some key OOP concepts in Android programming:

  1. Classes and Objects.
  2. Encapsulation.
  3. Inheritance.
  4. Polymorphism.
  5. Abstraction.
  6. Association.
  7. Composition.

Inheritance Definition

We live in a world where you can find software and programming everywhere. Modern programming languages ​​are based on the concepts of object-oriented programming (OOP). OOP is a paradigm that helps programmers structure code in a way that is easy to maintain, understand, and override. The four pillars of the OOP paradigm are abstraction, encapsulation, inheritance and polymorphism. Now, instead of bragging about OOP, let’s start with inheritance. Because that’s what this class is about.

Polymorphism

Polymorphism is one of the important features of object-oriented programming. This means taking on different roles in different environments. For example, a person can play different characters, can be a child, father/mother, employee, etc.

Interfaces

interfaces are an essential component for defining contracts or communication protocols between different components of an application. Interfaces provide a way to define a set of methods that classes must implement, ensuring consistency and enabling loose coupling between components.

Here are some common use cases for interfaces in Android programming:

  1. Listener Interfaces.
  2. Callback Interfaces.
  3. Adapter Interfaces.
  4. Service Interfaces.

Abstract Class

Abstract classes and interfaces are the most commonly used properties in Android. Forces you to override the onClick function when creating an action, indirectly extending the abstract Context class and implementing the View.OnClickListener interface. This is an example of Android’s default properties: abstract classes and interfaces.

Threads

A thread is a flow of program execution. The Java Virtual Machine (JVM) allows applications to run multiple threads of execution simultaneously.

Each thread has a priority. Higher priority threads run before lower priority threads. Each thread may or may not be marked as a daemon. When code running on a thread creates a new Thread object, the priority of the new thread is initially set to the priority of the creating thread, and is a daemon thread only if the creating thread is daemon.

Overloading

Method overloading is compile-time polymorphism. When overloading methods, multiple methods use the same method name with a different signature in the class. When overloading a method, the return type may or may not be the same, but in Java, you cannot overload a method by changing only the return type of the method, so you must change the parameters.

Overriding

Overriding methods is runtime polymorphism. When overriding a method, the derived class provides concrete implementations of methods already provided by the base or parent class. When overriding a method, the return type must be identical or covariant (the return type can vary in the same direction as the derived class).

Java Virtual Machine

The Java Virtual Machine( JVM) is a pivotal element of the Java platform. It’s a software perpetration that provides an terrain for executing Java bytecode, which is the collected form of Java source law. The JVM acts as an conciliator between the Java program and the underpinning tackle and operating system.

Then are some crucial aspects of the Java Virtual Machine

  1. Platform Independence.
  2. Execution Environment.
  3. Class Loading and Verification.
  4. Memory Management.
  5. Security.
  6. Performance Monitoring and Management.

Development Tools

There are several development tools available for Android programming that can greatly assist developers in building Android applications. Some of the popular tools include:

  1. Android Studio.
  2. Gradle.
  3. Android Software Development Kit (SDK).
  4. Android Emulator.
  5. ADB (Android Debug Bridge).
  6. Firebase.
  7. Git.
  8. ProGuard.
  9. Android Asset Packaging Tool (AAPT).
  10. Android Debugging Bridge (ADB).

Eclipse with ADT

As of my knowledge cutoff in September 2021, the Android Developer Tools (ADT) plug-in for Eclipse was deprecated and is no longer actively maintained. Google officially shifted its focus to Android Studio as the primary integrated development environment (IDE) for Android development. Therefore, I recommend using Android Studio for your Android programming needs.

However, if you still prefer to use Eclipse with the ADT plug-in, here are the general steps to install and use it:

  1. Install Eclipse:.
  2. Install the ADT plug-in.
  3. Configure the Android SDK.
  4. Create an Android project.
  5. Develop and build your app.

Installing Virtual machine

To install a virtual machine (emulator) for Android Ice Cream Sandwich (4.0) or Jelly Bean (4.1 to 4.3) for Android programming, you can use the Android Emulator provided by the Android SDK. Here’s how you can set it up:

  1. Install Android Studio.
  2. Launch Android Studio.
  3. Create a new AVD.
  4. Launch the AVD.
  5. Wait for the emulator to start.
  6. Test your app.

Configuring the installed tools

To configure the installed tools for Android programming, you typically need to set up and configure the following components:

  1. Java Development Kit (JDK).
  2. Integrated Development Environment (IDE).
  3. Android SDK.
  4. Android Virtual Device (AVD) Manager.
  5. Gradle.
  6. Additional Tools.

Run on emulator

To run an Android program on an emulator, you can follow these steps:

  1. Set up the Android Development Environment.
  2. Create an Android Virtual Device (AVD).
    • Launch Android Studio and open the AVD Manager.
    • Click on “Create Virtual Device” and select a device definition.
    • Choose a system image for the emulator (e.g., Android 11, Android 10).
    • Customize any additional settings and click “Finish” to create the AVD.
  3. Open your Android project.
  4. Select the emulator.
  5. Run the application.

Deploy on USB Android

As an AI language model, I cannot directly deploy myself onto a USB-connected Android device. However, I can guide you on how to utilize my capabilities on such a device through an internet connection.

To access my functionality on an Android device, you can follow these steps:

  • Connect your Android device to the internet via Wi-Fi or mobile data.
  • Open a web browser on your Android device (e.g., Chrome, Firefox).
  • Visit the OpenAI Playground or any platform that provides an interface to interact with GPT-3.5 models.
  • Type in your queries or prompts and interact with the model as you would on a computer.

Android UI Architectures

the stoner interface( UI) armature refers to the design and structure of the factors that make up the stoner interface of an Android operation. There are several architectural patterns generally used in Android development to organize and manage the UI factors effectively. Three popular UI infrastructures in Android programming are:

  1. Model-View-Controller (MVC).
  2. Model-View-Presenter (MVP).
  3. Model-View-View Model (MVVM).

Application Context

A singleton and instance accessible from the activity via getApplicationContext(). This context is tied to the application’s lifecycle. You can use the application context when your lifecycle requires a separate context from the current context, or when passing a context outside of an activity.

Intents

An intent is an abstract description of an action to be performed. It can be used with startActivity to start the activity, BroadcastIntent to dispatch the activity to the BroadcastReceiver of interest, Context.startService(Intent) or Context.bindService(Intent, ServiceConnection, int) to bind to the background service.

Intents provide a means to perform late binding between code in different applications. Its most important use is to trigger actions that can be thought of as connections between actions. It is essentially a passive data structure that contains an abstract description of the action to be performed.

Activity Lifecycle

The lifecycle of an Android activity is controlled by seven methods of the android.app.Activity class. Android actions are subclasses of the ContextThemeWrapper class.

An activity is one screen in Android. Similar to a Java window or frame.

Actions allow you to place any user interface component or widget on the same screen.

Activity lifecycle method 7 describes how activities behave in different states.

Multiple screen sizes

multiple screen sizes allows applications to be accessed from the largest number of users and the most diverse devices.

Design responsive and responsive app layouts to support as many screen sizes as possible. Responsive/Responsive Layout provides an optimal user experience regardless of screen size, so your app can work in both portrait and landscape orientations on phones, tablets, foldables and ChromeOS devices, and in resizable configurations such as multi-window mode. can.

User Interface Design

every Android UI designer takes UI design very seriously. The path of every project is through user interface design. User interface design is the face of every project and every website, application and desktop application. The user interface is the wall between the user and the backend through which the user can interact with the server through the design of the user interface.

Form Widgets

Form widgets are user interface components used to collect input from users. They include various elements such as text fields, checkboxes, radio buttons, dropdown menus, etc. These widgets help users provide information or make selections within a form.

Text Fields

Text fields allow users to input and edit textual information. They can be used for short inputs like names or longer inputs like paragraphs. Text fields typically provide a box where users can type their text.

Layouts

Layouts refer to the arrangement of user interface elements on a screen. They determine how different components are positioned in relation to each other. Common layout types include grid layouts, tabbed layouts, card layouts, and more. Layouts help organize content and create visual hierarchy.

Button Control

Buttons are interactive elements that users can click or tap to trigger an action. They are often used to submit forms, initiate processes, navigate to different pages, or perform specific functions within an application. Buttons can have different styles, such as flat buttons, raised buttons, or icon buttons.

Toggle Buttons

Toggle buttons are a type of button that can have two states: on and off. They represent a binary choice or a switch that users can toggle to enable or disable a particular option or setting.

Spinners (Combo Boxes)

Spinners, also known as combo boxes or dropdown lists, allow users to choose from a predefined list of options. When users click on a spinner, it displays a list of choices from which they can select one. Spinners conserve screen space by only showing the selected option initially.

Images

Images are graphical elements used in user interfaces to convey information or enhance visual appeal. They can be used to display logos, product images, icons, or illustrations. Images can be static or dynamic, and they play a crucial role in creating an engaging and visually appealing UI.

Menu

Menus provide a list of options or actions that users can choose from. They can be displayed as dropdown menus, context menus, or navigation menus. Menus help organize and present a range of choices to users in a structured manner.

Dialog

Dialogs, also known as modal windows, are temporary UI components that appear on top of the main screen to capture user attention or gather input. Dialogs typically have a specific purpose, such as displaying messages, requesting user confirmation, or collecting additional information.