Android App Components – Intents, Activities, and Broadcast Receivers Quiz Answers

Along with basic Java file I/O classes (like File and InputStream) and Android storage mechanisms, you will learn how to programme these fundamental Android elements by example.

Additionally, the Git source code management system will be taught to you. You will make incremental progress on a project that requires downloading, storing, and displaying images from distant websites throughout this MOOC.Join Now

Week 1: Android App Components – Intents, Activities, and Broadcast Receivers Quiz Answers

Quiz 1: Module 1 Quiz

Q1. Which of the following are examples of hardware elements commonly

found in Android devices (choose all that apply):

Central processing unit
Random access memory
Accelerometer
Wifi
Intent
Activity
Broadcast Receiver
Graphics processing unit

Q2. Which of the following describe the purposes of the Android Linux kernel (choose all that apply):

Shields OEMs from GNU Public License “virality”
Shields higher layers of Android from hardware diversity
Optimizes GNU Linux to meet the needs of mobile devices and apps
A set of Java-based services that form the environment in which Android apps run and are managed
Provides reusable capabilities that extend hardware-centric OS kernel and protocol mechanisms
Mediates access to–and sharing of–hardware resources

Q3. Which of the following are examples of layers and/or elements found in Android’s middleware infrastructure (choose all that apply):

Native C/C++ libraries
Power Management
Hardware abstraction layer
Android Run-Time (ART)
Activity Manager Service
Binder (IPC) Driver

Q4. Which of the following are examples of Android app components (choose all that apply):

Dalvik Virtual Machine
Content Providers
Package Manager
Activities
Services
Broadcast Receivers

Q5. Which of the following are true statements about Java threads (choose all that apply)

Each process can have multiple threads
Starting a thread takes a trivial amount of time and system resources
A thread is the smallest unit of execution for sequences of programmed instructions
Starting a Java thread is the only way to write a concurrent Android app
Every thread contains a call stack to keep track of method state
A Java thread must be given code to run when it is started

Q6. Which of the following are true statements about application

frameworks in the context of Android (choose all that apply):

Android frameworks enhance systematic reuse by providing canonical structure and functionality to mobile apps
Android frameworks enable app component to dictate the flow of control in a program, rather than the frameworks themselves
Android frameworks use an event-driven programming model to plug app code into them
Android frameworks provide an integrated set of components that provide a reusable architecture for a family of related mobile apps

Q7. Which of the following are true statements about the Android

Application Framework layer (choose all that apply):

It optimizes GNU Linux to meet the needs of mobile devices and apps
It contains system services that provide apps with the capabilities and info they need to do their work
Its system services run continuously during system operation
It shields OEMs from GNU Public License “virality”

Q8. Which of the following are true statements about the Android

apps (choose all that apply):

The bulk of these apps are written in C/C++
The bulk of these apps are written in Java
These apps cannot be written in C/C++
It’s possible to write portions of the apps in C/C++

Quiz 2: Git Module Quiz

Q1. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you want to start a local git repository. What command allows you to start that repository?

git begin
git init
git start
git commit
none of the above

Q2. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you have previously started a git repository. What command allows you to track new files or changes to existing files?

git add
git include
git also
git git
none of the above

Q3. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you have included a new file to be tracked to your current index. What command allows you to create a new snapshot of the progress you have made?

none of the above
git remove
git add
git commit
git status

Q4. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you have an existing repository. What command allows you to check the current status of the repository?

git remove
git add
git status
git clean
none of the above

Q5. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you have an existing repository. What command allows you to create new branches or see information on existing branches?

git look
git add
git read
git branch
git init
none of the above

Q6. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you have an existing repository. What command allows you to send your changes to a remote repository?

git push
git upload
git send
git download
none of the above

Q7. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you have an existing repository. What command allows you to download changes from a remote repository?

git push
none of the above
git pull
git acquire
git download

Q8. Assuming you are using the git command line terminal: The terminal’s current location is in a folder where you have an existing repository. What command allows you to combine two branches into one branch?

git add
git status
git merge
git combine
none of the above

Week 2: Android App Components – Intents, Activities, and Broadcast Receivers Quiz Answers

Quiz 1: Module 3 Quiz

Q1. Which of the following correctly describe what an intent is in Android (choose all that apply):

A message that describes an action to perform or an event that has occurred
An event handler that responds to system-side broadcast announcements
A message that provides a screen within which users can interact in order to do something
A component that runs in the background to perform long-running operations or access remote resources

Q2. Which of the following correctly describe benefits that an intent provides to apps in Android (choose all that apply):

An intent is the “glue” that helps integrate Android apps
An intent manages secure access to structured data
An intent simplifies app development since existing components can be reused as “black-boxes”
An intent defines the smallest unit of execution for sequences of programmed instructions

Q3. Which of the following correctly describe what is meant by an intent being a “passive” data structure (choose all that apply):

An intent just consists of fields and field access/mutator methods
An intent only contains public fields
An intent only contains static getter/setter methods
An intent cannot be used in a concurrent program

Q4. Which of the following correctly describe what is meant by an intent enabling “late runtime binding” of apps to components (choose all that apply):

App components started by intents are slow to launch
App components can be discovered and used at compile-time vs. runtime
App components can be discovered and used at runtime vs compile-time
App components started by intents must run in separate processes

Q5. Which of the following correctly describe the benefits of runtime discovery of app component (choose all that apply):

It enables apps with loosely-coupled components that can be extended and integrated dynamically
It enhances the security and robustness of apps by disallowing trojan horses
It enables systematic reuse that creates apps from predefined software components
It ensures that developers know at compile-time which component implementations their app will use

Q6. Which of the following are elements in an Android intent (choose all that apply):

Name
Extras
URL
Data
Service
Flags
Stack
Action

Q7. Which of the following statements are true for an “implicit” intent (choose all that apply):

The category must not be specified
The name must not be specified
The action must not be specified
The data must not be specified

Q8. Which of the following are true statements about implicit and explicit intent (choose all that apply):

Explicit intents are typically used to interact with components residing in other apps
Implicit intents are used to “tightly couple” activity and broadcast receiver components
Implicit intents are typically used to interact with components residing in other apps
Android delivers an implicit intent to a target component only if it matches one of its intent filters in the AndroidManifest.xml file
Explicit intents are particularly important when starting or binding to services
Android delivers an explicit intent to a target component without consulting filters in the AndroidManifest.xml file

Q9. Which of the following elements must match during implicit intent filtering for an intent to be delivered to a target component (choose all that apply):

Data
Extras
Name
Action
Category
Flags

Q10. Which of the following correctly describe what Android’s IntentService does (choose all that apply):

It is a component that provides a screen within which users can interact in order to do something
It expresses requests as intents & passes them between threads and/or processes
It’s a framework that handles asynchronous requests on demand
It is an event handler that responds to system-side broadcast announcement

Week 3: Android App Components – Intents, Activities, and Broadcast Receivers Quiz Answers

Quiz 1: Module 4 Quiz

Q1. Which of the following correctly describe what an activity is in Android (choose all that apply):

A component that runs in the background to perform long-running operations or access remote resources
A message that describes an action to perform or an event that has occurred
A component that defines a user-facing operation that’s displayed on a device screen
An event handler that responds to system-side broadcast announcements

Q2. Which of the following correctly define what a hook method is (choose all that apply):

It is the smallest unit of execution for sequences of programmed instructions
It is an event handler that responds to broadcast announcements
It is used to customize reusable framework classes to run app-specific logic
It is an unnamed block of code that can be passed around and executed later

Q3. Which of the following are lifecycle hook methods provided by Android’s activity framework (choose all that apply):

onPause()
onDestroy()
onStop()
onReceive()
onBind()
onCreate()
onResume()
onStart()

Q4. Which of the following statements about the startActivityForResult() method are true (choose all that apply):

This method is asynchronous and two-way
This method is asynchronous and one-way
This method is synchronous and two-way
This method is synchronous and one-way

Q5. Which of the following lifecycle hook methods may not be called in low memory situations (choose all that apply):

onDestroy()
onResume()
onPause()
onStop()

Q6. Which of the following Android system services call lifecycle hook methods on activities, services, and broadcast receivers (choose all that apply):

Window Manager Service
Location Manager Service
Notification Manager Service
Activity Manager Service

Q7. Which of the following statements accurately reflect what happens when a user enters text via the Android virtual keyboard (choose all that apply):

A new activity is started and its onCreate() hook method is called
The onResume() hook method is called back to return UI focus for this screen
The UI focus is unchanged and no lifecycle hook methods are called
The onStart() hook method is called back and the activity becomes visible

Q8. Which of the following correctly define what a “task” is in the contact of Android activities (choose all that apply):

It is a component that runs in the background performing long-running operations or accessing remote resources
It is a unit of execution for sequences of programmed instructions
It is a group of activities a user interacts with when performing a certain job
It is an unnamed block of code that can be passed around and executed later

Q9. Which of the following correctly describe how activities can be used in concurrent apps (choose all that apply):

Any long-duration operations must run in background threads via concurrency frameworks
An activity cannot be used in a concurrent app
UI toolkit components should only be accessed by the UI thread
All methods called in the UI thread must be short-duration and non-blocking

Q10. Which of the following correctly describes the capabilities of the Android HaMeR framework (choose all that apply):

It enables operations to run in one or more background threads and publish results to the UI thread without directly using threads, handlers, messages, and/or runnables
It is a component that runs in the background to perform long-running operations or access remote resources
It handles asynchronous requests on demand and expresses these requests as intents that are passed between threads and/or processes
It enables operations to run in one or more background threads and publish results to the UI thread

Week 4: Android App Components – Intents, Activities, and Broadcast Receivers Quiz Answers

Quiz 1: Module 5 Quiz

Q1. Which of the following correctly describe what a broadcast receiver is in Android (choose all that apply):

An event handler that responds to broadcast announcements
A component that defines a user-facing operation that’s displayed on a device screen
A message that describes an action to perform or an event that has occurred
A component that runs in the background to perform long-running operations or access remote resources

Q2. Which of the following Android system services are involved in routing intents to broadcast receivers (choose all that apply):

Telephony Manager Service
Window Manager Service
Activity Manager Service
Download Manager Service

Q3. Which of the following things can be done in receiver’s onReceive() hook method (choose all that apply):

Create status bar notifications
Start other Android components
Pop up toast messages
Show a dialog
Bind to a service
Register other receivers

Q4. Which of the following are types of Android intent broadcast mechanisms (choose all that apply):

Static
Ordered
Dynamic
Async
Sticky
Normal

Q5. Which of the following are reasons why broadcasting intents raises security issues (choose all that apply):

An app can send an intent to any receiver registered via registerReceiver or the AndroidManifest.xml file
The intent namespace is global
The onReceive() hook method in a receiver is called back in the UI thread
sendBroadcast() allows any other app to receive broadcast intents

Q6. Which of the following are key differences between the PingPongReceivers and PingPongReceiversEx apps (choose all that apply):

The PingPongReceivers app uses setPackage() to limit receivers to its components only, whereas the PingPongReceiversEx app does not.
The PingPongReceivers app displays “ping” and “pong” strings via toasts instead of via the notification status bar area.
The PongReceiver in PingPongReceivers runs in a different process as the MainActivity, whereas the PongReceiver in PingPongReceiversEx runs in the same process as MainActivity.
The PingPongReceiversEx app displays “ping” and “pong” strings via toasts instead of via the notification status bar area.

Q7. Which of the following statements are correct with respect to the capabilities provided by Android’s LocalBroadcastManager (choose all that apply):

It uses the Activity Manager Service to efficiently route intents to zero or more components
It enhances app security by ensuring intents can’t be sent or received by components in other apps
It performs optimizations for intra-app communication by ensuring intents don’t cross process boundaries
It allows broadcast receivers to run in the background performing long-running operations and/or accessing remote resources

Q8. Which of the following are key differences between the ImageDownloaderBRD and ImageDownloaderBRS apps (choose all that apply):

ImageDownloaderBRS uses the Activity Manager Service to route intents, whereas ImageDownloaderBRD uses the LocalBroadcastManager
ImageDownloaderBRS uses the LocalBroadcastManager to route intents, whereas ImageDownloaderBRD uses the Activity Manager Service
ImageDownloaderBRS uses SharedPreferences to communicate between the DownloadReceiver and the MainActivity, whereas ImageDownloaderBRD uses a boolean to communicate between the DownloadReceiver and the MainActivity.
The DownloadReceiver in ImageDownloaderBRS runs in a different process as the MainActivity, whereas the DownloadReceiver in ImageDownloaderBRD runs in the same process as MainActivity.

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