Android Development with Java

Android Studio and Your First App

Install Android Studio, create a project, and run a real app on an emulator or your own Android phone.

Layouts with XML and Material Design

Arrange text, images and buttons with ConstraintLayout and LinearLayout, use dp/sp units, and keep text in strings.xml.

Buttons, Input and Activities

Make the screen interactive: find views, react to clicks, read what the user typed, validate it and show feedback with Toasts and Snackbars.

Forms and Input Validation

Build a sign-up form with Material text fields, the right keyboard for each field, and friendly error messages, so bad data never reaches your database.

Lists with RecyclerView

Show long scrolling lists efficiently — products, courses, messages — using RecyclerView, an Adapter and a ViewHolder.

Multiple Screens with Intents

Open a details screen, pass data to it, go back, and open other apps — the phone dialler, WhatsApp or a web page — with Intents.

Fragments and Bottom Navigation

Most modern apps have tabs at the bottom (Home, Orders, Profile). Build them with Fragments, reusable pieces of screen hosted inside one Activity.

Dialogs, Snackbars and Menus

Confirm risky actions, offer undo, and put secondary actions in menus: the small interactions that make an app feel trustworthy.

ViewModel and LiveData: Surviving Rotation

Keep screen data safe when the phone rotates, and let the UI update automatically when data changes — the recommended Android architecture.

Saving Data: SharedPreferences and Room

Remember settings with SharedPreferences, and store real records — orders, notes, contacts — in a local database with Room.

Loading Data from the Internet

Call a web API with Retrofit, turn JSON into Java objects with Gson, and handle loading and errors — the way real apps show live data.

Permissions, Camera and Photos

Let users add a profile photo and a product picture. Learn runtime permissions, the photo picker, taking pictures with the camera, and how to ask for access politely.

Notifications and Background Work

Remind users about unpaid orders or daily lessons with notifications, and schedule reliable background jobs with WorkManager, even after the phone restarts.

Polish: Themes, Images and Permissions

Make the app look professional with Material themes and dark mode, load images from the web, and request permissions the right way.

Debugging and Testing Your App

Find bugs fast with Logcat and the debugger, read crash stack traces, and protect your app with unit tests and a simple Espresso UI test.

Final Project and Publishing

Pull everything together into a complete shop app, build a signed release, and learn how to publish on Google Play or share an APK.