Mobile App Development: Android with Kotlin

Android development offers great career opportunities. Start building apps with Kotlin.

Setting Up Android Studio

1. Download Android Studio
2. Install Android SDK
3. Create new project with Kotlin

Your First Android App

MainActivity.kt

kotlin
package com.example.myapp

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import android.widget.TextView

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val textView = findViewById<TextView>(R.id.textView)
        textView.text = "Hello, Android!"
    }
}

activity_main.xml

xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="24sp" />
</LinearLayout>

Components

Activities

Screens in your app

Fragments

Reusable UI components

Intents

Navigate between screens

RecyclerView

Display lists efficiently

Best Practices

• Follow Material Design guidelines
• Handle screen rotation
• Optimize for performance
• Test on multiple devices
• Use MVVM architecture