Android App Development

Tara is designing an Android app for her school project. She wants to ensure that all the buttons, text fields, and images are arranged neatly on the screen. What is the purpose of a layout in Android UI design?

• To manage database connections in the app

• To enhance the performance of the app

• To provide security features for the app

• The purpose of a layout in Android UI design is to organize and arrange UI components on the screen.

During a group project, Neha, Viaan, and Aarav are discussing the layout types they can use for their Android app. They want to ensure the app is user-friendly and visually appealing. What are three common layout types they can consider for their app development?

• LinearLayout, RelativeLayout, ConstraintLayout

• GridLayout

• FrameLayout

• TableLayout

Prisha is developing an Android application for her school project. What is the role of the Android Manifest file in her app?

• It manages network connections for the app.

• It contains the app's source code and resources.

• The Android Manifest file defines the structure and metadata of an Android application.

• It stores user data and preferences.

What is an Activity in Android?

• An Activity is a library for Android development.

• An Activity is a component of an Android app that provides a screen for user interaction.

• An Activity is a background service in Android.

• An Activity is a type of database in Android.

What are the key characteristics that differentiate an Activity from a Fragment in Android development?

• An Activity serves as the main entry point for an application, while a Fragment represents a portion of the user interface within an Activity.

• A Fragment can operate independently of an Activity.

• Activities can contain multiple Fragments, but a Fragment cannot contain an Activity.

• Fragments are always tied to a single Activity and cannot exist without it.

What method is called when an Activity is first created?

• onCreate()

• onResume()

• onStart()

• onPause()

What is the purpose of the onResume() method in the Activity lifecycle?

• The purpose of the onResume() method is to prepare the Activity to interact with the user.

• The onResume() method is for saving data before the Activity is destroyed.

• The onResume() method is used to pause the Activity.

• The onResume() method initializes the Activity's layout.

Describe the onPause() method in the context of Activity lifecycle.

• The onPause() method is called when the activity is first created.

• The onPause() method is part of the Activity lifecycle that allows the activity to pause operations and save state when it is no longer in the foreground.

• The onPause() method is responsible for resuming the activity after it has been paused.

• The onPause() method is used to start a new activity in the foreground.

What happens when an Activity is destroyed?

• The Activity is automatically restarted without any cleanup.

• The Activity's resources are permanently deleted without warning.

• The Activity's onDestroy() method is called, allowing for cleanup and resource release.

• The Activity's onPause() method is called to save the state.

How can you save the state of an Activity?

• Call finish() to end the Activity.

• Use SharedPreferences to save state.

• Override onSaveInstanceState() and use a Bundle to save state.

• Use a static variable to store state.