Android - Quiz 11

Any Android application can protect itself by declaring permissions that can be accessed by other applications. This can be achieved using the <permission> tag in the activity_main.xml file of the Android applications providing the permission.

• True
• False

How is a simulator different from an emulator?

• Emulators are only used to play old SNES games, simulators are used for software development
• The emulator is shipped with the Android SDK and third party simulators are not
• The emulator can virtualize sensors and other hardware features, while the simulator cannot
• The emulator imitates the machine executing the binary code, rather than simulating the behavior of the code at a higher level

Does Activity need UI?

• Yes
• No

Which of the following statements are correct?

• ArrayList increments 50% of its current size when it growing size in default
• ArrayList increments 100% of its current size when it growing size in default
• Vector increments 50% of its current size when it growing size in default
• Vector increments 100% of its current size when it growing size in default

Broadcast receivers are Android's implementation of a system-wide publish/subscribe mechanism, or more precisely, what design pattern?

• Observer
• Façade
• Mediator
• Command

Why use a factory class to instantiate a class when we can use a new operator?

• Factory design pattern results in more decoupled code as it allows us to hide creational logic from dependant code
• It allows us to introduce an Inversion of the Control container.
• It gives you a lot more flexibility when changing the application as our creational logic is hidden from dependant code.
• None of above

Which of the following is not true about fragments?

• A fragment has its own lifecycle and receives its own input events.
• It is not possible to remove a fragment while the activity is running.
• A fragment is defined in a Kotlin class.
• A fragment's UI is defined in an XML layout file.

With x = 0, which of the following are legal lines of Java code for changing the value of x to 1? 1. x++; 2. x = x + 1; 3. x += 1; 4. x =+ 1;

• 1, 2 & 3
• 1 & 4
• 1, 2, 3 & 4
• 3 & 2

"A relationship 'Is a' is the best description for: "

• Polymorphism
• Composition
• Aggregation
• Inheritance

Operations are used in a...........

• Package diagram
• Class diagram
• Activity diagram
• Use Case diagram