Material Theme customization in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the Material theme in the activity.

Android Kotlin

setTheme(R.style.[1])

Drag options to blanks, or click blank then click option'

ATheme_MaterialComponents_DayNight

BTheme_AppCompat

CTheme_Holo

DTheme_DeviceDefault

Attempts:

3 left

💡 Hint

Common Mistakes

Using AppCompat or Holo themes which are not Material Components themes.

Forgetting to set the theme before super.onCreate.

The Material Components theme is set using Theme_MaterialComponents_DayNight to enable Material theming.

2fill in blank

medium

Complete the code to apply a custom colorPrimary in the Material theme XML.

Android Kotlin

<color name="[1]">#6200EE</color>

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AcolorAccent

BcolorPrimary

CcolorBackground

DcolorSurface

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing colorPrimary with colorAccent or other colors.

Using invalid hex color codes.

colorPrimary defines the main brand color in Material themes.

3fill in blank

hard

Fix the error in the theme XML to correctly inherit from a Material Components theme.

Android Kotlin

<style name="AppTheme" parent="[1]">
    <!-- Customize your theme here. -->
</style>

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ATheme.MaterialComponents.Light.DarkActionBar

BTheme.DeviceDefault.Light.DarkActionBar

CTheme.Holo.Light.DarkActionBar

DTheme.AppCompat.Light.DarkActionBar

Attempts:

3 left

💡 Hint

Common Mistakes

Using AppCompat or Holo themes as parent which breaks Material theming.

Misspelling the theme name.

Material Components themes start with Theme.MaterialComponents to enable Material theming features.

4fill in blank

hard

Fill both blanks to define a custom Material theme color and apply it in colors.xml.

Android Kotlin

<color name="[1]">#03DAC5</color>
<color name="[2]">#018786</color>

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AcolorSecondary

BcolorPrimaryVariant

CcolorSecondaryVariant

DcolorPrimary

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing primary and secondary color names.

Using incorrect hex codes for variants.

colorSecondary and colorSecondaryVariant define the secondary colors in Material themes.

5fill in blank

hard

Fill all three blanks to create a theme overlay with a custom font family and apply it in styles.xml.

Android Kotlin

<style name="CustomFontTheme" parent="[1]">
    <item name="fontFamily">@font/[2]</item>
    <item name="textAppearanceHeadline1">@style/[3]</item>
</style>

Drag options to blanks, or click blank then click option'

ATheme.MaterialComponents.DayNight.NoActionBar

Bcustom_font

CTextAppearance.MaterialComponents.Headline1

DTheme.AppCompat.Light.NoActionBar

Attempts:

3 left

💡 Hint

Common Mistakes

Using AppCompat theme as parent which lacks Material support.

Incorrect font resource name or missing textAppearance style.

Use a MaterialComponents DayNight theme as parent, specify the custom font resource, and apply the Material headline text style.