Android Intents and Activity Navigation

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Questions and Answers

What happens to an Android application's activity when it is terminated by the system or by a call to its finish() method?

The activity is killed.

What is the purpose of the `Log.d` method in the provided code snippet?

To generate log messages.

What is the role of the `onCreate()` method in an Android activity's lifecycle?

To initialize the activity's user interface and perform necessary setup.

What is an intent in the context of Android applications?

A message object that can be used to request an action from an app component. Signup and view all the answers

What is the difference between an explicit intent and an implicit intent?

An explicit intent specifies the exact component to be invoked, while an implicit intent specifies an action to be performed. Signup and view all the answers

How do you link activities with intents in an Android application?

By using an intent to start another activity or to request an action from another component. Signup and view all the answers

In what scenario would an Android application use an implicit intent?

When the application wants to request an action from another app or component, without knowing the exact component to invoke. Signup and view all the answers

What is the purpose of the `onStart()` method in an Android activity's lifecycle?

To perform initialization tasks before the activity becomes visible. Signup and view all the answers

What is the main purpose of an activity in Android?

To represent a single screen with a user interface. Signup and view all the answers

What is the importance of declaring activities in AndroidManifest.xml file?

To ensure the app behaves as users expect. Signup and view all the answers

What is the role of onCreate() callback method?

Called when the activity is first created. Signup and view all the answers

What happens when the onPause() callback method is called?

The current activity is being paused and the previous activity is being resumed. Signup and view all the answers

What is the role of onStart() callback method?

Called when the activity becomes visible to the user. Signup and view all the answers

What is the significance of declaring the main activity in the manifest file?

To declare the MAIN action and LAUNCHER category. Signup and view all the answers

Can an application have multiple activities?

Yes, an application can have one or more activities without any restrictions. Signup and view all the answers

What is the role of onResume() callback method?

Called when the activity starts interacting with the user. Signup and view all the answers

What is the primary purpose of using intents in an Android application?

To navigate between activities and request functionality from other Android components. Signup and view all the answers

What type of object is an intent in Android?

An android.content.Intent type object. Signup and view all the answers

How can an intent contain data?

Via a Bundle. Signup and view all the answers

What is the difference between an explicit intent and an implicit intent?

An explicit intent directly defines the target component, while an implicit intent asks the Android system to evaluate registered components based on the intent data. Signup and view all the answers

How can you start an external activity using an intent?

Via the startActivity() method. Signup and view all the answers

What is an example of using an intent to interact with a component from another application?

Starting an external activity for taking a picture. Signup and view all the answers

What is the role of the Android system in evaluating implicit intents?

The Android system evaluates registered components based on the intent data. Signup and view all the answers

What is the benefit of using intents in an Android application?

It allows application components to request functionality from other Android components and interact with components from the same application as well as with components contributed by other applications. Signup and view all the answers

Study Notes

Android Activity Lifecycle

An Android application can have one or more activities, and navigation between them is done through Intents.
Intents are asynchronous messages that allow application components to request functionality from other Android components.
Intents are objects of the android.content.Intent type, and can contain data via a Bundle, which can be used by the receiving component.

Activity Lifecycle Methods

onCreate(): Called when the activity is first created.
onStart(): Called when the activity becomes visible to the user.
onResume(): Called when the activity starts interacting with the user.
onPause(): Called when the current activity is being paused and the previous activity is being resumed.

Intents

Intents can be explicit, where the target component is directly defined, or implicit, where the Android system evaluates registered components based on the intent data.
Intents can be used to start an external activity, such as taking a picture.

Declarations

Every activity defined for an application must be declared in the AndroidManifest.xml file.
The main activity for the app must be declared in the manifest with an intent that includes the MAIN action and LAUNCHER category.

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Android Intents and Activity Navigation

Questions and Answers

What happens to an Android application's activity when it is terminated by the system or by a call to its finish() method?

What is the purpose of the `Log.d` method in the provided code snippet?

What is the role of the `onCreate()` method in an Android activity's lifecycle?

What is an intent in the context of Android applications?

What is the difference between an explicit intent and an implicit intent?

How do you link activities with intents in an Android application?

In what scenario would an Android application use an implicit intent?

What is the purpose of the `onStart()` method in an Android activity's lifecycle?

What is the main purpose of an activity in Android?

What is the importance of declaring activities in AndroidManifest.xml file?

What is the role of onCreate() callback method?

What happens when the onPause() callback method is called?

What is the role of onStart() callback method?

What is the significance of declaring the main activity in the manifest file?

Can an application have multiple activities?

What is the role of onResume() callback method?

What is the primary purpose of using intents in an Android application?