To implement Force Dark, open styles.xml and add the following tag to the AppTheme style:īy adding forceDarkAllowed to the AppTheme and setting it to true, you apply Force Dark throughout the whole app. Check that you’ve downloaded Android 10 SDK and that you’ve set compileSdkVersion and targetSdkVersion to 29. It then decides which views it should invert to adapt to dark mode.īefore implementing Force Dark, make sure you’ve configured your project for Android 10. Instead of previewing, you’re going to implement Force Dark in PdfFever.įorce Dark runs in the rendering time and inspects the rendered views. You could preview how Force Dark will look in your app by using this option. There’s a way for users to enable the dark theme in your app, even if you don’t support it: by using the Override force-dark option in the Developer options. The quickest solution for implementing a dark theme is Force Dark, a new feature available from Android 10 that automatically applies the dark theme to your app.
If you don’t see it, go to the Settings app and find the Dark Theme option there.Įnable a dark theme using this switch and you’ll see that the system UI switched to dark mode, but PdfFever stayed the same. Pull down the Android Quick Settings menu, where you’ll see a Dark Theme toggle: Tap on any of the listed PDF files to open the reader screen. When you’re ready, build and run the app on a device or emulator running Android 10. Take a moment to familiarize yourself with the source code. This is what the package structure of the project looks like: It’s common for reader apps to have both light and dark themes to provide the best reading experience under various conditions and environments.įor the sake of simplicity, PdfFever comes bundled with predefined PDF files that you can read.ĭownload the materials for the tutorial by using the Download Materials button at the top or bottom of the page, and import the starter project into Android Studio. In this tutorial, you’ll add dark theme support to the PdfFever app, which lets you read files in PDF format. Understanding Koin isn’t necessary for this tutorial, but if you want to learn more about it, check out our Dependency Injection with Koin screencast. The sample app also uses Koin for dependency injection. If you’re not familiar with this pattern, please go through our MVVM on Android video course to familiarize yourself with it. The sample app in this tutorial uses the MVVM architectural pattern. If you’re completely new to the topic, please check out our Beginning Android Development with Kotlin series first. Note: This tutorial assumes that you have a solid knowledge of Android development.
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