📱 Dynamic Spinner & ArrayAdapter Demo

A hands-on Android project designed to teach students how to use the ArrayAdapter class to create dependent Dropdown menus (Spinners).

📖 Overview

This application mimics a simplified E-commerce filter. It demonstrates the logic of "Cascading Selectors":

1. User selects a Brand (e.g., Samsung).
2. App detects the selection via a Listener.
3. App dynamically updates the second dropdown to show only relevant models (e.g., S24, S23).

🎓 Key Concepts Covered

By studying this code, students will learn:

• ArrayAdapter: How to bridge data from strings.xml to UI components.
• Android Resources: Organizing static data in res/values/strings.xml using <string-array>.
• Event Handling: Implementing OnItemSelectedListener to trigger actions.
• Conditional Logic: Switching adapters based on array index positions.

📂 Project Logic

1. Data Source (strings.xml)

We store the data in static arrays to keep the Java code clean.

<string-array name="Mobile">
    <item>Apple</item>
    <item>Samsung</item>
</string-array>

<string-array name="apple">
    <item>iPhone 15</item>
    <item>iPhone 14</item>
</string-array>