Hands-on Android Development: Building Apps with Java & Android Studio

What is Android Studio? Android Studio is the official Integrated Development Environment (IDE) for Android app development, built by Google. It provides developers with a powerful and flexible environment to design, develop, test, and debug Android applications efficiently. Key Features of Android Studio: ✅ Intelligent Code Editor: It supports Java, Kotlin, and C++, offering features like code completion, refactoring, and real-time error checking. ✅ Layout Editor: A drag-and-drop UI designer that helps developers design app interfaces visually without writing XML manually. ✅ Gradle Build System: Automates and optimizes app building, making it easier to manage dependencies and configurations. ✅ Emulator for Testing: Provides a virtual Android device to test applications without needing a physical phone. ✅ APK Analyzer: Helps inspect the app’s APK file size and resources to optimize performance. ✅ Version Control Integration: Supports Git and other version control tools for collaborative development. ✅ Real-time Performance Profiler: Monitors CPU, memory, and network usage to optimize app performance. Why Developers Love Android Studio? User-friendly UI with a sleek and intuitive interface. Deep integration with Google Services, including Firebase and Google Play. Regular updates with the latest Android features and improvements. Cross-platform support for Wear OS, Android TV, and more. Android Studio is the ultimate toolkit for any developer looking to create high-performance Android applications! In this Workshop, I Have Developed 4 Applications, and here is a detailed Overview of Every Application 1.Simple Counter App This XML layout defines a simple Tap Counter App UI using a LinearLayout, two Button elements, and a TextView. Let’s break it down step by step. Root Layout - LinearLayout Count Button TextView - Display Counter Value Toast Button MainActivity.java File Package and Imports package com.example.android_workshop; This defines the package name of APP import android.os.Bundle; import android.view.View; import android.widget.TextView; import android.widget.Toast; import androidx.activity.EdgeToEdge; import androidx.appcompat.app.AppCompatActivity; import androidx.core.graphics.Insets; import androidx.core.view.ViewCompat; import androidx.core.view.WindowInsetsCompat; Defining Variables and Extending AppCompatActivity public class MainActivity extends AppCompatActivity { TextView t1; int count = 0; onCreate() Method - Initializing the UI @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); EdgeToEdge.enable(this); setContentView(R.layout.activity_main); Linking TextView from XML to Java t1 = this.findViewById(R.id.text1); Handling Window Insets (Edge-to-Edge UI) ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> { Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars()); v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom); return insets; }); count() Method - Increasing the Counter public void count(View view) { count++; t1.setText("" + count); } toast() Method - Showing a Toast Message public void toast(View view) { Toast.makeText(MainActivity.this, "Hello my dear Connections" + count, Toast.LENGTH_LONG).show(); } How Does the App Works? 1️⃣ Pressing the "Count" button increases the counter and updates the TextView. 2️⃣ Pressing the "Toast" button displays a message showing the current count. Simple Calculator App This XML file defines the UI for a simple calculator app in Android using LinearLayout. Overview: Dark Theme (android:background="#000") for a stylish look. Title (TextView): Displays "Calculator" in red text. Two Input Fields (EditText): Allow users to enter two numbers. Four Buttons (Button): Perform addition (+), subtraction (-), multiplication (), and division (/). Result Display (TextView): Shows the output after a calculation. Next step? Implement logic in MainActivity.java to perform calculations when buttons are clicked! This Java class defines the logic for a simple calculator app in Android. It handles basic arithmetic operations (+, -, , /) based on user input. Key Highlights: UI Elements: EditText e1, e2; → Input fields for user-entered numbers. TextView t1; → Displays the result. Arithmetic Operations: Addition (Pluse) – Adds two numbers. Subtraction (Minus) – Subtracts second number from the first. Multiplication (Multiplication) – Multiplies two numbers. Division (Division) – Divides first number by second. EdgeToEdge & Insets Handling: Ensures UI adapts to system bars. Event Handling: Click events trigger calculations when users pres

Mar 2, 2025 - 14:53

Hands-on Android Development: Building Apps with Java & Android Studio

What is Android Studio?
Android Studio is the official Integrated Development Environment (IDE) for Android app development, built by Google. It provides developers with a powerful and flexible environment to design, develop, test, and debug Android applications efficiently.

Key Features of Android Studio:
✅ Intelligent Code Editor: It supports Java, Kotlin, and C++, offering features like code completion, refactoring, and real-time error checking.

✅ Layout Editor: A drag-and-drop UI designer that helps developers design app interfaces visually without writing XML manually.

✅ Gradle Build System: Automates and optimizes app building, making it easier to manage dependencies and configurations.

✅ Emulator for Testing: Provides a virtual Android device to test applications without needing a physical phone.

✅ APK Analyzer: Helps inspect the app’s APK file size and resources to optimize performance.

✅ Version Control Integration: Supports Git and other version control tools for collaborative development.

✅ Real-time Performance Profiler: Monitors CPU, memory, and network usage to optimize app performance.

Why Developers Love Android Studio?
User-friendly UI with a sleek and intuitive interface.
Deep integration with Google Services, including Firebase and Google Play.
Regular updates with the latest Android features and improvements.
Cross-platform support for Wear OS, Android TV, and more.
Android Studio is the ultimate toolkit for any developer looking to create high-performance Android applications!

In this Workshop, I Have Developed 4 Applications, and here is a detailed Overview of Every Application

1.Simple Counter App

This XML layout defines a simple Tap Counter App UI using a LinearLayout, two Button elements, and a TextView. Let’s break it down step by step.

Root Layout - LinearLayout

Count Button

TextView - Display Counter Value

Toast Button

MainActivity.java File

Package and Imports

package com.example.android_workshop;

This defines the package name of APP

import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

Defining Variables and Extending AppCompatActivity

public class MainActivity extends AppCompatActivity {
    TextView t1;
    int count = 0;

onCreate() Method - Initializing the UI

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    EdgeToEdge.enable(this);
    setContentView(R.layout.activity_main);

Linking TextView from XML to Java

    t1 = this.findViewById(R.id.text1);

Handling Window Insets (Edge-to-Edge UI)

    ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
        Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
        v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
        return insets;
    });

count() Method - Increasing the Counter

public void count(View view) {
    count++;
    t1.setText("" + count);
}

toast() Method - Showing a Toast Message

public void toast(View view) {
    Toast.makeText(MainActivity.this, "Hello my dear Connections" + count,
            Toast.LENGTH_LONG).show();
}

How Does the App Works?
1️⃣ Pressing the "Count" button increases the counter and updates the TextView.
2️⃣ Pressing the "Toast" button displays a message showing the current count.

Simple Calculator App

This XML file defines the UI for a simple calculator app in Android using LinearLayout.

Overview:

Dark Theme (android:background="#000") for a stylish look.
Title (TextView): Displays "Calculator" in red text.
Two Input Fields (EditText): Allow users to enter two numbers.
Four Buttons (Button): Perform addition (+), subtraction (-), multiplication (*), and division (/).
Result Display (TextView): Shows the output after a calculation.

Next step? Implement logic in MainActivity.java to perform calculations when buttons are clicked!

This Java class defines the logic for a simple calculator app in Android. It handles basic arithmetic operations (+, -, *, /) based on user input.

Key Highlights:
UI Elements:
EditText e1, e2; → Input fields for user-entered numbers.
TextView t1; → Displays the result.
Arithmetic Operations:
Addition (Pluse) – Adds two numbers.
Subtraction (Minus) – Subtracts second number from the first.
Multiplication (Multiplication) – Multiplies two numbers.
Division (Division) – Divides first number by second.
EdgeToEdge & Insets Handling: Ensures UI adapts to system bars.
Event Handling: Click events trigger calculations when users press buttons.