As of Part I, we successfully implemented a RecyclerView (known as LazyColumn in Compose), populating it with a list of puppies that we have for adoption. 🐶
But as I mentioned, we still have some things to do before we call it a complete Compose app. The two things left now are:
- To style the app to our final look.
- To implement a detailed view screen.
In this part of the series, we'll look at how styles and themes work in Compose, taking our app from Part I and giving it the final look that we want to achieve:
To look at where we need to continue from, let's first look at the final screen from Part I:
The things we're going to look at:
- Change color throughout the app using
- Look at how dark/light mode works in Compose.
- Fix status bar and system navigation bar to adapt to our app's theme.
Let's get started!
Enabling Dark Mode 💡
As you can see in our final screen, our app looks like it has dark mode enabled. If that's the final look we want (or if we want an app that has support for Dark mode), it's super easy with how our project is set up initially by the Android Studio template. Let's explore a bit more to see what we mean.
If you open you project directory, you can see that you already have
/ui/theme directory and inside that, you have a few Kotlin classes: Color, Shape, Theme, Type.
These are all the classes that you need to modify the theme and styling of your app.
Since in our case, we need to enable dark mode for our app, do the following:
BarkThemecomposable, replace the darkTheme default value from
3. Run the app to see the changes.
We can see that our background has changed.. but, with that, we also have our text color changed but not the puppy card color.
Let's quickly fix that:
- Add a new color named
3. Now open
4. Inside the
DarkColorPalette variable, add a new color definition for
surface and set its value to the
graySurface color that we set in #2.
Note: In case you want to know what
surfaceis, it's a color definition provided by the color system of Material Design that affect surfaces of components, such as cards, sheets, and menus:
5. Finally, if you've been following the tutorial step by step, you might remember that we hardcoded our card color when we implemented it in Part I, which is not really a great way of doing it. In order to let our app color values from
Color.kt work consistently throughout the app, it's always a better idea to change the color values of the UI elements using
Color.kt rather than changing each UI element's color individually.
So at this step, we remove that hardcoded color from our puppy card in order for the card to show the true
surface color we just set.
PuppyListItemcomposable function, remove this parameter from the Card composable:
backgroundColor value: backgroundColor = Color.White
Run the app now to see the changes.
Super! We've done everything we needed to do at this time.
Do you see that the status bar looks a bit odd at the top with that odd color? And what about the system navigation bar at the bottom? It'd be extra cool if we fixed them to match our overall theme.
But there's a catch. Since Jetpack Compose is still early to work with, it comes with its limitation for the time being (And I'm not entirely sure if there even is this particular limitation). So to fix the status bar and navigation bar, we're going to head to our dear 'ol XML for this.
The Final Fixes 👨🎨
In order to change the status bar color to match our theme:
- Add the same gray color we added to our
Note: You might notice that you have two
themes.xmlin themes directory. Make it a good practice from now onwards to change the values in both these files whenever you're making a change because these two files refer to the dark mode and light mode theme of the app.
4. Define the
statusBarBackground attribute inside
Theme.Bark and set its value to our gray color.
5. Now add this
statusBarBackground attribute as our value for
Now in order to change the system navigation bar's color:
- Add another item for
navigationBarColorand set its value to
?android:attr/windowBackgroundattribute (which is a color value that changes automatically with system preferences)
Run the app now to see the changes.
And.. there you go! Thats our final look of the app! 😍
Give yourself a pat on the back at this point for having now learnt how theming and styling are done in Compose. 👏
Happy coding! 💻
Source code for the Final Version
Awesome that you came this far! 👏 Now I'd love to know what the most annoying part of this post was or if it was of any help to you. Either ways, you can drop me a DM on: www.twitter.com/waseefakhtar ✌️