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Changes in Code

  • Code changes for dynamic behavior occur in the MainActivity.kt file.

  • Design layout and appearance adjustments are made in XML files.

Understanding Packages

  • Packages contain predefined sets of code built into Android Studio.

  • Example: Using math functions (addition, division) from the math package without rewriting the code.

  • Standard packages are essential for Android app functionality, linking to SDKs and Gradle.

Main Activity File

  • MainActivity.kt file name matches the class name (class MainActivity).

  • Automatically generated files during project creation are critical for app functionality.

  • New imports should be added below existing imports in the file.

Emulator and Device Management

  • Pixel phones are developed by Google and use Android.

  • You can switch emulators in Android Studio if one device isn't functioning.

  • App designs adjust automatically to fit the specifications of a different emulator device.

Gradle and Running the App

  • Gradle files play an important role in app performance.

  • Use the run button (big green arrow) to execute the app and see its appearance.

Debugging

  • The debugging tool identifies and helps fix errors in your code.

  • When referencing multiple screens, code must correctly link classes and naming conventions.

Cross-Referencing Files

  • MainActivity.kt must correctly reference its corresponding designer file, activity_main.xml.

  • Avoid modifying auto-generated files; doing so can break the app's backend functionality.

Importance of Naming Conventions

  • Ensure that XML and Kotlin files have matching names to enable proper communication.

  • Proper referencing is crucial; mismatches can lead to non-functional apps.