Preguntas respuestas Android 2

1. What is a navigation Drawer?

It is a widget that animate a ViewPager

Is a panel that display app’s main navigation options on the left edge of the screen 

Is a panel that display app’s main navigation options on the right edge of the screen

2. Which of the following is a design pattern that avoids frequent call of findViewById() during ListView scrolling?

ListView

RelativeLayout

ViewHolder

3. Examine the following code:

Which is the missing line to add succesfully the fragment to the Activity

fragmentTransaction.commit(); 

No need to add an extra line since fragmentTransaction.add() add the fragment to the Activity

fragmentTransaction.addToActivity();

4. Which three methods we must implement for a RecyclerView?

onCreateViewHolder(), onDraw() and getItemCount()

onCreateViewHolder(), onAttachView() and getItemCount()

ConCreateViewHolder(), onBindViewHolder() and getItemCount() 

5. What is the primary use of a CoordinatorLayout?

A container for animations

A container for a specific interaction with one or more child views 

A container for a specific interaction with snackBar and ReciclerView

6. What are unit test?

Is a block of code that helps to develop software faster

Is a block of code that validates another block of code that the result is expected 

Is code that Android auto generated to verify that java code is correct implemented

Suposse whe have the next UI test on Espresso

7. Which is the obtained result?

The code will throw an error

Unsuccessful

Successful 

8. Which widget let the user to swipe left or right showing an entire new screen?

ListView

ViewPager 

Intent

9. When is recomended to use a floating action button?

When we have space available on the screen

When we want to use an intent on a button

When we have a clear action on the screen, that represent a primary action 

10. A container for displaying large data sets that can be scrolled very efficiently by maintaining a limited number of views.

RelativeLayout

RecyclerView 

LinearLayout