Android Fundamentals of Activities for Beginners

Learn how to migrate between activities using explicit intent and pass data with or without a bundle, illustrated by a username being sent from a main to a second activity.

Explore how the bundle facilitates sharing data between activities using explicit intents, and compare direct and indirect methods for passing data.

Explore the Android activity life cycle and its methods—onCreate, onStart, onResume, onPause, onStop, onDestroy, and onRestart—and how they run when launching apps and navigating between main and second activities.

Explore how Android activity lifecycle methods handle screen rotation by showing portrait to landscape transitions, where the activity is destroyed and recreated, as demonstrated in Android Studio.

Explore how screen rotation affects Android activities, highlighting that edit text preserves its value across orientation changes while text view and buttons may reset; learn portrait versus landscape behavior.

Explore how screen rotation affects view state by comparing views that retain state (edit text, checkbox, radio button, switch) with those that don't (text view, button).

Explore practical solutions to handle screen orientation in Android apps, including restoring the activity state, managing configuration changes manually, and a bonus method.

Learn how to handle screen orientation in Android by saving and restoring activity state with onSaveInstanceState and onRestoreInstanceState, preserving the result across lifecycle changes.

Learn to handle the button click event in Android by implementing the onClick listener interface. Wire two buttons, design with constraint and linear layouts, and change layout backgrounds on clicks.

Learn to handle Android button clicks by directly setting onClick listeners on two buttons, changing the ConstraintLayout and LinearLayout colors, and running the app in the emulator.

Learn to handle a button click in Android using onClick in XML (way 3), generate the corresponding method in MainActivity, and change constraint and linear layouts' background colors.

Learn to pass data between Android activities using explicit intents, sending a string from the main activity to the second activity and displaying it in a text view.

Pass data between Android activities using a bundle. Create a bundle, put a string with key name as Hello Android, attach with putExtras, and display it in the second activity.

Develop a two-activity demo app to illustrate the activity lifecycle, logging onCreate, onStart, onResume, onPause, onStop, onRestart, and onDestroy as users switch between activities.

Learn to start another activity using an intent in android studio by wiring two buttons to launch a second activity, creating the second activity, and using startActivity with the intent.