Android Activity Lifecycle

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What is the primary purpose of the onDestroy() method?

To pause the activity

To resume the activity

To release all the resources which are not released by the onStop() method (correct)

To start the activity

What is the name of the class that is used for error logging in Android?

Error

Warning

Log (correct)

Debug

In which method is the setContentView() function typically used?

onStart()

onResume()

onCreate() (correct)

onPause()

What is the order of the callback methods when an activity is started?

onCreate() -> onStart() -> onResume() (A) Signup and view all the answers

What is the purpose of the onPause() method?

To pause the activity (B) Signup and view all the answers

What is the name of the package that contains the Log class?

android.util (B) Signup and view all the answers

What happens to an app when a pop-up dialog box blocks it?

Its onPause() method is called (A) Signup and view all the answers

What is a typical action taken in the onPause() method?

Stop listening for GPS information (A) Signup and view all the answers

What event triggers an app's onResume() method?

The app becomes fully visible and in the foreground (B) Signup and view all the answers

What happens to an app when it is no longer visible and in the foreground?

It stops (B) Signup and view all the answers

What is the purpose of the onPause() method?

To release system resources and stop CPU-intensive tasks (D) Signup and view all the answers

What is the purpose of using different app layouts for portrait vs landscape screen orientation?

To provide a better user experience (D) Signup and view all the answers

Where is the layout file for landscape orientation stored?

res/layout-land (B) Signup and view all the answers

What happens to the current activity when the device's configuration changes?

It is destroyed (A) Signup and view all the answers

What is the purpose of the onSaveInstanceState method?

To save the activity's state required to recreate it later (B) Signup and view all the answers

What is the system's role in saving an activity's state?

It writes information about views to a Bundle (B) Signup and view all the answers

What is an example of state that needs to be saved when an activity is destroyed?

The current positions of game pieces (B) Signup and view all the answers

What is the purpose of creating a LayoutParams object?

To specify the layout parameters for other views (C) Signup and view all the answers

What is the method used to set the text of a Button?

setText (C) Signup and view all the answers

What is the purpose of the setPadding method?

To add space between views (B) Signup and view all the answers

What is the method used to add a view to the LinearLayout?

addView (A) Signup and view all the answers

What is the value of the width of the EditText set to?

LinearLayout.LayoutParams.WRAP_CONTENT (B) Signup and view all the answers

What is the background color of the TextView?

Color.MAGENTA (A) Signup and view all the answers

What happens to the values of variables when the activity is destroyed and recreated during rotation?

They are lost and cannot be recovered (B) Signup and view all the answers

What method is called by the system before onPause(), onStop(), and onDestroy()?

onSaveInstanceState() (D) Signup and view all the answers

What is the purpose of onSaveInstanceState()?

To save the state data of instance variables (B) Signup and view all the answers

When creating a UI programmatically, what is the first step?

Create a LinearLayout object to contain all the views (D) Signup and view all the answers

What is the benefit of using onSaveInstanceState()?

It stops the values of variables from being lost or reset (D) Signup and view all the answers

Why is the activity not loaded from the main.xml file when creating a UI programmatically?

Because the activity is created programmatically (D) Signup and view all the answers

Android Activity Lifecycle

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Questions and Answers

What is the primary purpose of the onDestroy() method?

What is the name of the class that is used for error logging in Android?

In which method is the setContentView() function typically used?

What is the order of the callback methods when an activity is started?

What is the purpose of the onPause() method?

What is the name of the package that contains the Log class?

What happens to an app when a pop-up dialog box blocks it?

What is a typical action taken in the onPause() method?

What event triggers an app's onResume() method?

What happens to an app when it is no longer visible and in the foreground?

What is the purpose of the onPause() method?

What is the purpose of using different app layouts for portrait vs landscape screen orientation?

Where is the layout file for landscape orientation stored?

What happens to the current activity when the device's configuration changes?

What is the purpose of the onSaveInstanceState method?

What is the system's role in saving an activity's state?

What is an example of state that needs to be saved when an activity is destroyed?

What is the purpose of creating a LayoutParams object?

What is the method used to set the text of a Button?

What is the purpose of the setPadding method?

What is the method used to add a view to the LinearLayout?

What is the value of the width of the EditText set to?

What is the background color of the TextView?

What happens to the values of variables when the activity is destroyed and recreated during rotation?

What method is called by the system before onPause(), onStop(), and onDestroy()?

What is the purpose of onSaveInstanceState()?

When creating a UI programmatically, what is the first step?

What is the benefit of using onSaveInstanceState()?

Why is the activity not loaded from the main.xml file when creating a UI programmatically?

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