Theme Utils for light and dark.

ThemeUtils.java

public class ThemeUtils {

    /**
     * MODE_NIGHT_NO
     */
    public static final int LIGHT = AppCompatDelegate.MODE_NIGHT_NO;

    /**
     * MODE_NIGHT_YES
     */
    public static final int DARK = AppCompatDelegate.MODE_NIGHT_YES;

    public static final String APPLIED_THEME = "APPLIED_THEME";


    public static void applyTheme(int mode) {
        AppCompatDelegate.setDefaultNightMode(mode);
    }

    public static int getCurrentMode(Context context) {
        int mode = -1;
        int currentNightMode = context.getResources().getConfiguration().uiMode
                & Configuration.UI_MODE_NIGHT_MASK;
        switch (currentNightMode) {
            case Configuration.UI_MODE_NIGHT_NO:
                // Night mode is not active, we're in day time
                mode = LIGHT;
                break;
            case Configuration.UI_MODE_NIGHT_YES:
                // Night mode is active, we're at night!
                mode = DARK;
                break;
        }
        return mode;
    }

}