Android Beginner Project with Database Connectivity & Layout Design 📱

Introduction

• Lecture by Nilesh Borate from Village Technology
• Overview of an Android project with database connectivity, attractive layout design, etc.

Setting Up the Project

• **Creating a New Project: **
  1. Go to File > New > New Project
  2. Select Empty Activity and click on Next
  3. Give your application a name, package name, save location, and choose Java as the programming language
  4. Minimum SDK version: API 21 (Android 5.0)
  5. Click on Finish
• **Project Structure: **
  • MainActivity.java and activity_main.xml created
  • Project structure visible in the IDE
• Creating Emulator:
  1. Go to AVD Manager
  2. Click Create Virtual Device, select device (e.g., Pixel 2), set screen size, resolution, density
  3. Choose Android version (API 30 - Android 11.0)
  4. Click Next and Finish
• Running the App:
  • Choose emulator from dropdown and click Run App
  • Default message “Hello World” displayed on emulator

Layout Design

• activity_main.xml:
  • Constraint layout used for design through drag-and-drop
  • Default view: TextView with “Hello World” message
  • Design sections: Code section, Split section, Design section
• **Adding Layout Elements: **
  • Drag and drop background images, icons, layouts to drawable folder
  • Design various UI components like TextView (e.g., “Hello World”)
• **Creating Login Activity: **
  • New Empty Activity: LoginActivity.java and activity_login.xml
  • Set background image, add TextView, EditText (username, password), Button (login), and TextView (new user)
  • Define properties via attributes or code, such as text size, style, color, padding, and input type
  • Use constraints to position elements in the layout

Adding Material and Resources

• **Adding Drawable Resources: **
  • Copy images, icons, shapes into drawable folder
  • Define colors in colors.xml within the values folder and reference them in your layout
• **Changing Activity Backgrounds: **
  • Set background properties for activities from drawable resources

Handling User Interactions

• **Login Button: **
  • Implement setOnClickListener() for login button to validate inputs
  • Display toast messages for login success or input validation (e.g., empty fields)
• **Navigating to Registration Activity: **
  • Using Intent to navigate on clicking “Register”
  • Create RegistrationActivity.java and activity_registration.xml
  • Similar layout design to login activity, add more fields (e.g., confirm password, email)
  • Validate inputs and create user in database

Database Setup and Operations

• **Creating Database Helper Class: **
  • Create Database.java extending SQLiteOpenHelper
  • Implement onCreate() and onUpgrade() methods for creating and updating tables
  • Define tables (e.g., users table) and write database queries (e.g., insert user, check login)
• **Implementing Registration and Login: **
  • Register function to insert user details into database
  • Login function to validate user credentials and manage sessions with SharedPreferences

Displaying Data in Activities

• **Using Intents: **
  • Passing data between activities using Intent extras
• **Updating Layouts Dynamically: **
  • Using ArrayAdapter and ListView for displaying dynamic content
  • Example: Showing list of doctors in FindDoctorActivity

Advanced UI Components

• **CardView and GridLayout: **
  • Using CardView inside GridLayout to display interactive items (e.g., health articles)
  • Example: Design HomeActivity with multiple card views
• **RecyclerView Implementation: **
  • For displaying extensive lists like health articles or tests with consistent layout

Extra Functionalities

• **Health Articles Section: **
  • Displaying a list of health articles with images and descriptions
  • Navigating to detailed article view
• **Session Management & Shared Preferences: **
  • Storing user session details in SharedPreferences
  • Fetching user data across activities

Complete Flow

• Register user, login, and navigate through activities (e.g., list doctors, book appointments)
• Insert and retrieve data from the database
• Display toasts and handle user inputs in real time
• Comprehensive error handling and UI feedback to users

Summary

• Create a basic Android app with user authentication, database connectivity, and dynamic UI updates
• Use various Android components and structures such as activities, intents, SQLite database, SharedPreferences, and UI layouts
• Employ effective error handling and user interaction feedback

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**Note: **

• This is a basic starter project for Android beginners to understand fundamental concepts and implement commonly used features in an app