XAM1 - Android

Question 1

In Android everything is done with what?

Answer 1

• Activities

Question 2

What does an Activity consist of?

Answer 2

• XML layout (axml)

- C# code file

Question 3

How do you define app primary entry point?

Answer 3

• MainLauncher = true

Question 4

Can you include java jar libraries in Xam Android apps?

Answer 4

• yes
• there are 2 methods
• one easier, one more complex

Question 5

How do you associate Activity code behind to UI markup?

Answer 5

• SetContentView

Question 6

How do you access controls on UI view?

Answer 6

• FindViewById

- ex FindViewById(Resource.Id.myButton)

Question 7

What are Views?

Answer 7

• Sometimes called widgets

- ex TextView, EditText, Button

Question 8

What are types of Layouts?

Answer 8

• LinearLayout (like StackLayout)
• GridLayout
• RelativeLayout
• NestedLayout (nest other layout types)

Question 9

Where are layouts located?

Answer 9

• they are considered Resources so go under Resources folder in axml files

Question 10

Properties on UI views should use what syntax?

Answer 10

• android: namespacing convention

Question 11

What does compiling an Android app include?

Answer 11

• Java SDK (JDK)
• Android SDKs
• Mono.NET

Question 12

Can you code against specific Android versions?

Answer 12

• yes

- use Android.OS.Build.VERSION.SdkInt checked against Android.OS.BuildVersionCodes.whatever enum

Question 13

What is Context in Android?

Answer 13

• represents Android runtime environment surrounding your activity and also provides additional services

Question 14

What is Explicit Intent?

Answer 14

• you are telling Android exactly what you want to load

- generally used to start Activity inside your APK

Question 15

What is Implicit Intent?

Answer 15

• tell Android you need to do something and it will decide what to load
• often loads outside of your APK
• ex; I want to take a picture

Question 16

What is an Intent?

Answer 16

• a request sent to Android telling it about activity you want
• pass it a Context (this, current Activity) and a Type (typeof(NewActivity))

Question 17

How do you pass data between Activities?

Answer 17

• Bundles, key value pairs of simple types or serialized objects
• intent.PutExtra

Question 18

How do you fire a new Activity?

Answer 18

• StartActivity or StartActivityWithResult

Question 19

What are 3 return types for an Activity?

Answer 19

• no return
• success/fail
• success/fail with data

Question 20

What happens when an Activity with result returns?

Answer 20

• fires OnActivityResult in source passes back RequestCode (INT)

Question 21

How do you setup an Implicit Intent?

Answer 21

• use intent.SetAction to set action type

- use intent.SetData and intent.PutExtra to provide extra information per documentation

Question 22

Can you verify an implicit intent is available at runtime?

Answer 22

• yes

- intent.ResolveActivity(PackageManager)