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Tricky questions... Or...not?

A vibrant and engaging illustration of an Android app developer working on a mobile application, surrounded by code snippets, diagrams of the Android lifecycle, and various icons representing Android components.

Ultimate Android Development Quiz

Test your knowledge with our Ultimate Android Development Quiz! Designed for both aspiring developers and seasoned pros, this quiz contains 15 tricky questions that cover essential concepts in Android development.

Evaluate your understanding of Android lifecycle
Challenge your comprehension of service behavior
Determine your knowledge of activity management

15 Questions4 MinutesCreated by CodingEagle43

You're using an app that should keep your really important input data in a DB, but someone keeps calling you, you also have 2 left hands and keep exitting the app and nothing seems to work today. Where should the app save the DB updates safely?

OnResume()

OnStop()

OnDestroy()

OnPause

You have a MainActivity that started a GameActivity, which has a running timer as it starts. You override the back button like this:

@Override public void onBackPressed() {

super.onBackPressed();

Intent I = new Intent(GameActivity.this,MainActivity.class);

startActivity(i);

finish();

}

but as you press back and you reach MainActivity again, the timer is still running in the backgroud. Where should you stop the timer?

OnResume()

OnPause

Lies, it'll work just fine

OnStop()

Can a user save all database updates in onStop ()?

Yes, a user can save all database updates in onStop()

No, a user can save in onSavedInstance()

No, a user can save in a Bundle()

No, In some situations, a user can't reach onStop()

What are the return values of onStartCommand() in android services?

START_STICKY

START_NOT_STICKY

START_REDELIVER_INTENT

All of the above

None of the above

Suppose we have activities A, B, C, D which go like this: A->B->C->D. If B has a SingleTask launching mode and we want to launch B again, how will the flow look like?

A->B->C->D->B

A->B->C->D

A->B

Impossible in this case

Which component is not activated by an Intent?

Activity

Services

ContentProvider

BroadcastReceiver

How do you stop a unbounded service?

StopSelf()

StopUnboundService()

StopService()

It stops when it finishes its tasks

When an activity doesn’t exist in memory it is in:

Starting state

Running state

Loading state

Inexistent state

Suppose we have activities A, B, C, D which go like this: A->B->C-D. If D has a SingleTop launching mode and we want to launch D again, how will the flow look like?

A->B->C->D->D

A->B->C->D

A->B->C->D (where D is a new instance of D Activity)

Impossible in this case

Which of the following should be used to save the unsaved data and release resources being used by an Android application?

Activity.onStop()

Activity.onPause()

Activity.onDestroy()

Activity.onShutdown()

What happens to a Bound Service when the app components bound to it, unbind?

The service destroyes itself

The service keeps running in the background

An exception is thrown

Once bound, you can't unbind

Paused is used

If the activity is at the background and still visible

If the activity is not visible

If the activity is at the foreground and visible

If the activity is at the foreground

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