Activity recycling
Handling Activity Data After Being Recycled When an activity enters the stopped state, it may be recycled by the system. For example, when Activity A launches Activity B, Activity A …
The Activity Lifecycle
Understanding the Activity Lifecycle Is Crucial — It Helps You Write Smooth-Running Apps And it allows you to manage app resources more efficiently. Delivering a better user experience. Android activities …
Intent – Passing data between activities
Navigating Between Activities Using Intents Jumping from the Main Activity to Another Activity Use an explicit Intent. We add an empty activity and name it AddCourseActivity, making sure to check …
Destroying an activity
Pressing the back button will destroy the current activity. If you don’t want to destroy the activity using the back button, you can also use the finish(); method provided by …
Destroying an activity
Pressing the back button will destroy the current activity. If you don’t want to destroy the activity using the back button, you can also use the finish(); method provided by …
Menu button (three dots) in the top right corner
Using Menu in an Activity Create a menu folder under res Then add a main menu file under the menu folder Right-click the menu folder and choose Add Menu Resource …
Toast
Using the Toast Notification Control Toast is a handy notification feature provided by the Android system. In your app, you can use it to show quick, short messages to the …
Registering activities
All activities must be registered in AndroidManifest.xml to take effect Open it up and you’ll see So our activity is actually already registered, but it’s not set as the main …
Activity
What Is an Activity and How to Add One Manually 1. What Is an Activity? An Activity is a component in an Android app that provides a user interface and …
Logging functionality
Using Log in Android 1. Android Log Utility Class: Log Android SDK provides a dedicated logging utility class android.util.Log, which offers 5 levels of logging methods, arranged from lowest to …
build.gradle
The Role of the build.gradle File I. Introduction to the Gradle Build System Android Studio uses Gradle to build projects. Gradle is a highly advanced build tool that uses a …
Resource res files and how to change app name and icon
1. res Directory Structure The res/ directory is organized into subdirectories by resource type: Directory Purpose drawable General images (e.g., backgrounds, illustrations) mipmap-prefixed App icons (Launcher Icons) values Strings, styles, …
How an App Actually Runs
1. Starting from the Launch Entry Point To understand how any Android app launches, you have to start with the global configuration file: AndroidManifest.xml. Open AndroidManifest.xml and look for the …
Project analysis and directory structure
When you first create an Android project, Android Studio offers several project view modes. Project mode displays the actual physical directory structure, making it especially helpful for beginners to understand …
Understanding Android
What is Android? This course covers the older version of Android development, built with Java and XML layouts. The current mainstream approach is Kotlin + Compose. Android System Architecture (4 …