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
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
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.
Conclusion:
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