Android Navigation

Question 1

What are the 3 different types of navigation in Material, a design system created by Google

Answer 1

Forward (hierarchical)
Lateral
Reverse

Question 2

What is lateral navigation

Answer 2

Moving between screens at the same level of hierarchy

Question 3

What are the 3 ways lateral navigation can be implemented

Answer 3

Navigation drawer
Tabs
Bottom navigation

Question 4

What are the 3 ways forward navigation is achieved

Answer 4

• Moving sequentially through a flow
• Moving from a parent screen to a child screen
• Moving directly from one screen to another

Question 5

What is reverse navigation and how is it achieved

Answer 5

Moving backwards through the screens
- Chronologically or hierarchically

Question 6

What are the 3 key components of the navigation component in jetpack

Answer 6

1. Navigation graph
2. NavHostFragment
3. NavController

Question 7

What is a navigation graph and how is it used

Answer 7

XML resource file, contains information about destinations and actions

Question 8

What is the NavHostFragment and where does it get added. Where does it get initiated

Answer 8

Provides an area for the navigation to occur. It gets added to the layout file where you want the navigation to occur.
It gets initiated in the activities code, along with a navController

Question 9

What does the NavController do

Answer 9

Handles navigation in the app and manages the back stack

Question 10

What do you need to do to use the navigation bar instead of the default action bar?

Answer 10

In the manifest file:
add
android:theme=”@style/Theme. NavigationJava.NoActionBar”

Question 11

What does the ViewModel do

Answer 11

Bridge between the data/business logic and the views
Survives config changes
Handles UI Logic
Gets and processes data from the Model
Observes changes

Question 12

What are two essential components that are needed to use Retrofit

Answer 12

1. Retrofit interface (contract that defines how the app will interact with the API.
2. The Retrofit client (creates the Retrofit interface static instance)

Question 13

After setting up the Retrofit instance and the Retrofit client what do you have to get the MainActivity to do?

Answer 13

Calls the retrofit client method for getInterface and then does the custom search