Lesson 5: Layouts

1. Which of the following is a ViewGroup?

   EditText

   LinearLayout

   TextView

   Button

2. Which of the following listed view hierarchies is not valid?

   LinearLayout > TextView, TextView, ImageView

   ScrollView > LinearLayout > TextView, Button, ScrollView > TextView

   TextView > TextView, ImageView, ScrollView

   ConstraintLayout > TextView, EditText, Button

3. Styles are resources defined in styles.xml. Using styles, you can define colors, fonts, text size, and many other characteristics of a view. True or false?

   True, you can define these.

   False, you cannot define these.

4. A View can contain any number of View or ViewGroup as its children. True or false?

   True, View can contain any number of View or ViewGroup.

   False, View can have exactly 1 child.

5. What is EditText a subclass of?

   TextField

   LinearLayout

   TextView

   Button

6. Which of the following visibility attribute values, if set on a view, makes it so the view is hidden and does not take up any space in the layout?

   visible

   invisible

   gone

   hide

7. Which one of the following statements is true about Button views?

   A Button view is a ViewGroup.

   You can only have three Button views per screen.

   Button views are clickable, and on click, the attached click listener performs an action.

   Button is an extension of ImageView.

8. In a ConstraintLayout, which of the following choices describes the constraints needed to keep a view in place during runtime?

   Two horizontal constraints.

   One vertical constraint.

   At least one horizontal and one vertical constraint.

   There is no need to constrain the view.

9. Which of the following constraint types expands a view only as much as needed to fit its contents?

   Wrap content

   Match constraint

   Fixed constraint

   Baseline constraint

10. What are some benefits of using the Layout Editor in Android Studio?

    Choose as many answers as you see fit.

    Drag and drop UI elements onto the screen with the visual design editor

    Edit view attributes

    Test button click behavior and see how the app will respond

    Select device type and size for the preview of your layout

11. Which of the following is not a reason for minimizing calls to findViewById()?

    Every time findViewById() is called, it traverses the view hierarchy.

    findViewById() runs on the main or UI thread.

    These calls can slow down the user interface.

    Your app is less likely to crash.

12. Which is the correct way to reference bound data in the XML layout?

    android:text="@={myDataClass.property}"

    android:text="@={myDataClass}"

    android:text="@={myDataClass.property.string}"

    android:text="@={myDataClass.bound_data.property}"

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