Android Online Quiz

Answer : A

Explanation

Android is a stack of software applications for mobile devices, which includes an operating system, middleware applications, and some key applications. It executes within own process and own instance of Dalvik Virtual Machine. DVM executes byte code and later transforms into .dex format files.

Answer : C

Explanation

Margin specifies the space left on four sides in the layout and padding specifies the exact position where the element going to be taking place in the layout.

Answer : D

Explanation

START_STICKY − If android stops services forcefully, using with START_STICKY, it can be restarted automatically without the user interaction.

START_NOT_STICKY − If android stops services forcefully, it will not restart services till user start services.

START_REDELIVER_INTENT − If android stops services forcefully, it will restart services by re-sending an intent.

Answer : C

Explanation

The task is a collaboration of applications. It contains one or more applications in it

Answer : A

Explanation

There is only an object which can be accessed by all other class.

Answer : C

To find the last known location of a phone we need to use LastKnownLocation, the syntax is as shown below.

Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

Answer : B

Using with log cat, we can find the exception, which has occurred along with the line number. Using of line number, we can find the errors.

Answer : D

Json elements are Number, string, boolean, null, array, and object

Answer : C

Using with Javac, we can compile Java files

Use dx tool to convert all Java class files to single dex file

Use AAPT tool to create apk file

Sign the apk file by using jar signer

Zipalign of signed apk

Answer : D

The concurrent executable unit is called a thread. It's performs some background functionalities with services.