Mastering Android Development with Java

What are the key principles of UI design in Android?

• Consistency, intuitive navigation, responsive design, accessibility, visual hierarchy

• Static layout

• Complex navigation

• Minimalistic design

How does the Android activity lifecycle begin?

• The activity lifecycle begins with the onCreate() method.

• The activity lifecycle begins with onPause() method.

• The activity lifecycle begins with onStart() method.

• The activity lifecycle begins with onResume() method.

What method is called when an activity is first created?

• onStart()

• onCreate()

• onPause()

• onResume()

What is the purpose of the onStart() method in an activity?

• The onStart() method is used to initialize the database connection.

• The onStart() method prepares the activity to become visible and interact with the user.

• The onStart() method saves the activity's state before it is destroyed.

• The onStart() method handles user input events directly.

How can you save the state of an activity during configuration changes?

• Call finish() to restart the activity.

• Use onPause() to save data directly.

• Implement a static variable to hold state.

• Override onSaveInstanceState() to save data in a Bundle.

What is the difference between onPause() and onStop()?

• onPause() is for partial visibility; onStop() is for complete invisibility.

• onPause() is for complete invisibility; onStop() is for partial visibility.

• onPause() is for background processing; onStop() is for foreground processing.

• onPause() is called when the app is closed; onStop() is called when the app is opened.

What is the role of the onResume() method in the activity lifecycle?

• The onResume() method is part of the activity lifecycle that indicates the activity is now in the foreground and ready for user interaction.

• The onResume() method is responsible for saving the activity's state.

• The onResume() method is used to pause the activity's execution.

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

How do you navigate between activities in an Android application?

• Use Fragments to manage activity transitions.

• Call the finish() method to switch activities.

• Override the onBackPressed() method for navigation.

• Use Intents to start a new activity.

What is the purpose of the setContentView() method?

• To initialize the database connection for an activity.

• To set the user interface layout for an activity in Android.

• To handle user input events in an activity.

• To manage background services for an activity.

How can you implement responsive UI design in Android?

• Implement fixed pixel sizes for all UI elements.

• Use ConstraintLayout, resource qualifiers, and density-independent pixels (dp) for responsive design.

• Avoid using resource qualifiers for different screen sizes.

• Use LinearLayout exclusively for all layouts.