Is there an API to detect which theme the OS is using – dark or light (or other)?

by

Google has just published the documentation on the dark theme at the end of I/O 2019, here.

In order to manage the dark theme, you must first use the latest version of the Material Components library: "com.google.android.material:material:1.1.0-alpha06".

Change the application theme according to the system theme

For the application to switch to the dark theme depending on the system, only one theme is required. To do this, the theme must have Theme.MaterialComponents.DayNight as a parent.

<style name="AppTheme" parent="Theme.MaterialComponents.DayNight">
    ...
</style>

Determine the current system theme

To know if the system is currently in dark theme or not, you can implement the following code:

switch (getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) {
    case Configuration.UI_MODE_NIGHT_YES:
        …
        break;
    case Configuration.UI_MODE_NIGHT_NO:
        …
        break; 
}

Be notified of a change in the theme

I don’t think it’s possible to implement a callback to be notified whenever the theme changes, but that’s not a problem. Indeed, when the system changes theme, the activity is automatically recreated. Placing the previous code at the beginning of the activity is then sufficient.

From which version of the Android SDK does it work?

I couldn’t get this to work on Android Pie with version 28 of the Android SDK. So I assume that this only works from the next version of the SDK, which will be launched with Q, version 29.

Result

result

More Related Contents:

  1. How to change theme for AlertDialog
  2. How to change current Theme at runtime in Android [duplicate]
  3. Accessing external storage in Android API 29
  4. Android P – ‘SQLite: No Such Table Error’ after copying database from assets
  5. Switching application-wide theme programmatically?
  6. Android design support library for API 28 (P) not working
  7. Error importing HoloEverywhere
  8. Theme/Style is not applied when inflater used with ApplicationContext
  9. Connect to Wifi in Android Q programmatically
  10. Download Manger not working in Android Pie 9.0 NetworkSecurityConfig: No Network Security Config specified, using platform default
  11. Notifications fail to display in Android Oreo (API 26)
  12. Android – margins specified in custom style not taking effect
  13. How to show daily offline notifications in Android 10?
  14. Call recorder not working in android 10 (Q)
  15. Turning on wifi using WifiManager stops to work on Android 10
  16. Overriding referenced style attributes
  17. How can I make the status bar white with black icons?
  18. Interstitial Admob ads: “IllegalStateException: Only fullscreen activities can request orientation”
  19. “Unknown bits set in runtime_flags: 0x8000” warning in Logcat on Android Q emulator
  20. How do you set the title color for the new Toolbar?
  21. Crash on Android 10 (InflateException in layout/abc_screen_simple line #17)
  22. Android – Back button in the title bar
  23. Styling EditText view with shape drawable to look similar to new holographic theme for Android < 3.0
  24. API 29 Mediastore Access
  25. Themes in Android?
  26. Can’t start activity from BroadcastReceiver on android 10
  27. How to change tab style in Android?
  28. Modifying the color of an android drawable
  29. BLE scan is not working when screen is off on Android 8.1.0
  30. Android Q, programmatically connect to different WiFi AP for internet

Leave a Comment