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This codelab is part of the Android Kotlin Fundamentals course. You'll get the most value out of this course if you work through the codelabs in sequence. All the course codelabs are listed on the Android Kotlin Fundamentals codelabs landing page.

Another level of design is building coherent user flows, or use cases, that let users accomplish tasks. This form of design is called user experience design (UXD), and some designers specialize in it.

If you don't have access to a designer, here are a few tips for getting started:

• Define use cases. Write up what users should accomplish with your app, and how.
• Implement a design. Don't be attached to your first draft, and only make it 'good enough,' because you'll change it after you see how real users interact with it.
• Get feedback. Find anyone who you can talk into testing your app—your family, friends, or even people you just met at a Google Developer Group. Ask them to use your app to perform a use case while you watch and take detailed notes.
• Refine! With all that information, make the app better, and then test it again.

Here are some other questions to ask yourself when designing a great app experience. You learned techniques for tackling these issues in preceding codelabs:

• Does the app lose its state when the user rotates their device?
• What happens when the user opens the app? Does the user see a loading spinner, or is the data ready in an offline cache?
• Is the app coded in a way that is efficient and ensures that the app is always responsive to user touch?
• Does the app interact with backend systems in a way that never leads to odd, incorrect, or stale data being presented to the user?

As you work on apps for larger audiences, it's essential to make your apps accessible to as many types of users as possible. For example:

• Many users interact with computer systems in different ways. Many users are color blind, and colors that contrast for one user may not work for another. Many users have vision impairments, from needing reading glasses all the way through blindness.
• Some users can't use touch screens, and they interact via other input devices such as switches.

Good design is the most important way to get users using your app.

These codelabs are too short to teach you everything about design for Android, but they'll get you started in a good direction, and you can continue to learn and develop on your own.

RecyclerView

How to use Architecture Components, including ViewModel, with the recommended architecture to create a well-structured and efficient app

Data binding, coroutines, and how to handle clicks

How to connect to the internet and cache data locally using a Room database

How to set view properties

How to extract resources into and use resources from XML resource files

• The basics of Android's styling system
• How to use attributes, styles, and themes to customize your app

• Improve the design of a starter app with view attributes, styles, and themes

The GDG-finder starter app builds on everything you've learned so far in this course.

The app uses ConstraintLayout to lay out three screens. Two of the screens are just layout files that you'll use to explore colors and text on Android.

The third screen is a GDG finder. GDGs, or Google Developer Groups, are communities of developers that focus on Google technologies, including Android. GDGs around the world host meetups, conferences, study jams, and other events.

As you develop this app, you work on the real list of GDGs. The finder screen uses the device's location to sort the GDGs by distance.

If you're lucky and there's a GDG in your region, you can check out the website and sign up for their events! GDG events are a great way to meet other Android developers and learn industry best practices that didn't fit in this course.

The screenshots below show how your app will change from the beginning to the end of this codelab.

Android provides a rich styling system that lets you control the appearance of all the views in your app. You can use themes, styles, and view attributes to affect styling. The diagram shown below summarizes the precedence of each method of styling. The pyramid diagram shows the order in which styling methods are applied by the system, from the bottom up. For example, if you set the text size in the theme, and then set the text size differently in the view attributes, the view attributes will override the theme styling.

Styles

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• Use a style to create a collection of reusable styling information, such as font size or colors.
• Good for declaring small sets of common designs used throughout your app.

Apply a style to several views, overriding the default style. For example, use a style to make consistently styled headers or a set of buttons.

Themes

• Use a theme to define colors for your whole app.
• Use a theme to set the default font for the whole app.
• Apply to all views, such as text views or radio buttons.
• Use to configure properties that you can apply consistently for the whole app.

fontFamily.

When Android styles a view, it applies a combination of themes, styles, and attributes, which you can customize. Attributes always overwrite anything specified in a style or theme. And styles always overwrite anything specified in a theme.

The screenshots below show the GDG-finder app with light theme (left) and a dark theme (right), as well as with a custom font and header sizes. This can be implemented in several ways, and you learn some of them in this codelab.

In this task, you use attributes to style headers for the text in the app layout.

1. Download and run the GDG-finder starter app.
2. Notice that the home screen has a lot of uniformly formatted text, which makes it hard to figure out what the page is about, and what's important.
3. Open the home_fragment.xml layout file.
4. Notice that the layout uses ConstraintLayout to position elements inside a ScrollView.
5. Notice that for each view, the constraint and margin layout attributes are set in the view, because these attributes tend to be customized for each view and screen.
6. In the title text view, add a textSize attribute to change the size of the text to 24sp.
   As a reminder, sp stands for scale-independent pixels, which are scaled by both the pixel density and the font-size preference that the user sets in their device settings. Android figures out how large the text should be on the screen when it draws the text. Always use sp for text sizes.

7. Set the textColor of the title text view to opaque gray, by setting it to an aRGB value of #FF555555.

8. To open the Preview tab in Android Studio, select View > Tool Windows > Preview, or click the vertical Preview button on the right edge of the Layout Editor. In the preview, verify that the title is gray and larger than it was before, as shown below.

Tip: An aRGB value expresses a color's alpha transparency, red value, green value, and blue value. An aRGB value uses a hexadecimal number ranging from 00 to FF for each color component.

#(alpha)(red)(green)(blue)

#(00-FF)(00-FF)(00-FF)(00-FF)

Examples:

• #FFFF0000 for opaque red
• #5500FF00 for semi-transparent green
• #FF0000FF for opaque blue

9. Style the subtitle to have the same color as the header, with a smaller font, 18sp. (The default alpha is FF, opaque. You can omit the alpha value if you are not changing it.)

10. In this codelab, the goal is to style the app to be a bit whimsical while looking professional, but you can style it any way you wish. Try the following attributes for the subtitle text view. Use the Preview tab to see how your app's appearance changes. Then remove these attributes.

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11. Don't forget to undo the textAllCaps, textStyle, and background attributes from the subtitle view before you continue.
12. Run your app, and it should already look better.

When using fonts with your app, you could ship the necessary font files as part of your APK. While simple, this solution is usually not recommended, because it makes your app take longer to download and install.

Android lets apps download fonts at runtime using the Downloadable Fonts API. If your app uses the same font as another app on the device, Android only downloads the font once, saving the device's storage space.

In this task, you use downloadable fonts to set the font of every view in your app that uses the theme.

Open the home_fragment.xml in the Design tab.

In the Component Tree pane, select the title text view.

In the Attributes pane, find the fontFamily attribute. You can find it in the All Attributes section, or you can just search for it.

Click the drop-down arrow.

Scroll to More Fonts and select it. A Resources window opens.

6. In the Resources window, search for lobster, or just lo.
7. In the results, select Lobster Two.
8. To the right, below the font name, select the Create downloadable font radio button. Click OK.
9. Open the Android Manifest file.
10. Near the bottom of the manifest, find the new <meta-data> tag with the name and resource attributes set to 'preloaded_fonts'. This tag tells Google Play Services that this app wants to use downloaded fonts. When your app runs and requests the Lobster Two font, the font provider downloads the font from the internet, if the font is not already available on the device.

11. In the res/values folder, find the preloaded_fonts.xml file, which defines the array that lists all the downloadable fonts for this app.
12. Likewise, the res/fonts/lobster_two.xml file has information about the font.
13. Open home_fragment.xml and notice in the code and preview that the Lobster Two font is applied to the titleTextView, and thus applied to the title.

14. Open res/values/styles.xml and examine the default AppTheme theme that was created for the project. It currently looks as shown below. To apply the new Lobster Two font to all the text, you'll need to update this theme.
    
15. In the <style> tag, notice the parent attribute. Every style tag can specify a parent and inherit all the parent's attributes. The code specifies the Theme defined by the Android libraries. The MaterialComponents theme that specifies everything from how buttons work to how to draw toolbars. The theme has sensible defaults, so you can customize just the parts you want. The app uses the Light version of this theme without the action bar (NoActionBar), as you can see in the screenshot above.
    

16. Inside the AppTheme style, set the font family to lobster_two. You need to set both android:fontFamily and fontFamily, because the parent theme uses both. You can check home_fragment.xml in the Design tab to preview your changes.

17. Run the app again. The new font is applied to all the text! Open the navigation drawer and move to the other screens, and you see that the font is applied there as well.

In home_fragment.xml, find the title text view, which has the attribute for the lobster_two font. Delete the fontFamily attribute and run the app. Because the theme sets the same font family, there is no change.

Put a different fontFamily attribute back into the title text view:
app:fontFamily='serif-monospace'
Make sure it's in the app space!

3. Run the app, and you see that the attribute local to the view overrides the theme.
   

4. Remove the fontFamily attribute from the title text view.

Themes are great for applying general theming to your app, such as a default font and primary colors. Attributes are great for styling a specific view and adding layout information such as margins, padding, and constraints, which tend to be specific to each screen.

In the middle of the style-hierarchy pyramid are styles. Styles are reusable 'groups' of attributes that you can apply to views of your choice. In this task, you use a style for the title and subtitle.

Open res/values/styles.xml.

Inside the <resources> tag, define a new style using the <style> tag, as shown below.

It's important to think about style names as semantic when you name them. Select a style name based on what the style will be used for, not based on the properties that the style affects. For example, call this style Title, not something like LargeFontInGrey. This style will be used by any title anywhere in your app. As a convention, TextAppearance styles are called TextAppearance.Name, so in this case, the name is TextAppearance.Title.

The style has a parent, just as a theme can have a parent. But this time, instead of extending a theme, the style extends a style, TextAppearance.MaterialComponents.Headline6. This style is a default text style for the MaterialComponentsRadan 7 software. theme, so by extending it you modify the default style instead of starting from scratch.

3. Inside the new style, define two items. In one item, set the textSize to 24sp. In the other item, set the textColor to the same dark gray used before.

4. Define another style for the subtitles. Name it TextAppearance.Subtitle.
5. Because the only difference from TextAppearance.Title will be in the text size, make this style a child of TextAppearance.Title.
6. Inside the Subtitle style, set the text size to 18sp. Here's the completed style:

In home_fragment.xml, add the TextAppearance.Title style to the title text view. Delete the textSize and textColor attributes.
Themes override any TextAppearance styling that you set. (The pyramid diagram at the beginning of the codelab shows the order in which styling is applied.) Use the textAppearance property to apply the style as a TextAppearance so that the font set in the Theme overrides what you set here.

2. Also add the TextAppearance.Subtitle style to the subtitle text view, and delete the textSize and textColor attributes. You have to apply this style as a textAppearance also, so that the font set in the theme overrides what you set here.

Important: When you have both themes and styles manipulating text, you must apply the text properties as a textAppearance attribute if you want the text properties in the theme to override what's set and inherited in the style.

3. Run the app and your text is now consistently styled.

Android Studio project: GDGFinderStyles.

• Use themes, styles, and attributes on views to change the appearance of views.
• Themes affect the styling of your whole app and come with many preset values for colors, fonts, and font sizes.
• An attribute applies to the view in which the attribute is set. Use attributes if you have styling that applies to only one view, such as padding, margins, and constraints.
• Styles are groups of attributes that can be used by multiple views. For example, you can have a style for all your content headers, buttons, or text views.
• Themes and styles inherit from their parent theme or style. You can create a hierarchy of styles.
• Attribute values (which are set in views) override styles. Styles override the default style. Styles override themes. Themes override any styling set by the textAppearance property.

• Define styles in the styles.xml resource file using the <style> and <item> tags.

Using downloadable fonts makes fonts available to users without increasing the size of your APK. To add a downloadable font for a view:

1. Select the view in the Design tab, and select More fonts from the drop-down menu of the fontFamily attribute.
2. In the Resources dialog, find a font and select the Create downloadable font radio button.
3. Verify that the Android manifest includes a meta-data tag for preloaded fonts.

When the app first requests a font, and the font is not already available, the font provider downloads it from the internet.

Android developer documentation:

Other resources:

• Developing Android Apps with Kotlin (Udacity course)
• Kotlin Bootcamp for Programmers (Udacity course)

This section lists possible homework assignments for students who are working through this codelab as part of a course led by an instructor. It's up to the instructor to do the following:

• Assign homework if required.
• Communicate to students how to submit homework assignments.
• Grade the homework assignments.

Instructors can use these suggestions as little or as much as they want, and should feel free to assign any other homework they feel is appropriate.

If you're working through this codelab on your own, feel free to use these homework assignments to test your knowledge.

Question 1

Which tag is used to define themes?

▢ <style>

▢ <theme>

▢ <meta-tag>

▢ <styling>

Question 3

What is the difference between themes and styles?

▢ Themes apply to the entire app, while you can apply styles to specific views.

▢ Themes cannot inherit from other themes, but styles can inherit from other styles.

▢ Styles cannot inherit from other styles, but themes can inherit from other themes.

▢ Themes are provided by the Android system, while styles are defined by the developer.

TextView in your app has a Theme that sets the font size to 12sp, a defined style that sets it to 14sp, and a fontSize attribute of 16sp, what is the size of the displayed font on the screen?

▢ 12sp

▢ 14sp

▢ 16sp

▢ 18sp

Start the next lesson: Superhero Themes For Android Free Download

For links to other codelabs in this course, see the Android Kotlin Fundamentals codelabs landing page.