Android Activity Lifecycle
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Questions and Answers

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?

    <p>onCreate() -&gt; onStart() -&gt; onResume()</p> Signup and view all the answers

    What is the purpose of the onPause() method?

    <p>To pause the activity</p> Signup and view all the answers

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

    <p>android.util</p> Signup and view all the answers

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

    <p>Its onPause() method is called</p> Signup and view all the answers

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

    <p>Stop listening for GPS information</p> Signup and view all the answers

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

    <p>The app becomes fully visible and in the foreground</p> Signup and view all the answers

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

    <p>It stops</p> Signup and view all the answers

    What is the purpose of the onPause() method?

    <p>To release system resources and stop CPU-intensive tasks</p> Signup and view all the answers

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

    <p>To provide a better user experience</p> Signup and view all the answers

    Where is the layout file for landscape orientation stored?

    <p>res/layout-land</p> Signup and view all the answers

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

    <p>It is destroyed</p> Signup and view all the answers

    What is the purpose of the onSaveInstanceState method?

    <p>To save the activity's state required to recreate it later</p> Signup and view all the answers

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

    <p>It writes information about views to a Bundle</p> Signup and view all the answers

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

    <p>The current positions of game pieces</p> Signup and view all the answers

    What is the purpose of creating a LayoutParams object?

    <p>To specify the layout parameters for other views</p> Signup and view all the answers

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

    <p>setText</p> Signup and view all the answers

    What is the purpose of the setPadding method?

    <p>To add space between views</p> Signup and view all the answers

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

    <p>addView</p> Signup and view all the answers

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

    <p>LinearLayout.LayoutParams.WRAP_CONTENT</p> Signup and view all the answers

    What is the background color of the TextView?

    <p>Color.MAGENTA</p> Signup and view all the answers

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

    <p>They are lost and cannot be recovered</p> Signup and view all the answers

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

    <p>onSaveInstanceState()</p> Signup and view all the answers

    What is the purpose of onSaveInstanceState()?

    <p>To save the state data of instance variables</p> Signup and view all the answers

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

    <p>Create a LinearLayout object to contain all the views</p> Signup and view all the answers

    What is the benefit of using onSaveInstanceState()?

    <p>It stops the values of variables from being lost or reset</p> Signup and view all the answers

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

    <p>Because the activity is created programmatically</p> Signup and view all the answers

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