Citra Android Themes !full! -

Feature Draft: Custom UI Themes for Citra Android

Title: Implement User-Selectable UI Themes and Custom Asset Support

Summary: This feature introduces a native theming engine to the Citra Android client, allowing users to personalize the visual appearance of the emulator interface. Users will be able to select from pre-installed color schemes (Light, Dark, Midnight) or import custom "Skin" files to change background textures, button icons, and accent colors.

User Stories:

Proposed Technical Implementation:

  1. Theme Manager (Kotlin/XML):

    • Create a singleton ThemeManager class to handle theme state persistence using SharedPreferences.
    • Utilize Android’s native Theme.MaterialComponents capabilities to dynamically apply color palettes at runtime.

  2. Asset Loader:

    • Support for external theme files (stored as .zip archives in /Citra/themes/).
    • The app will parse a theme.json file within the archive containing hex values for UI elements and paths to replacement PNGs for UI icons (buttons, bars, etc.).

  3. UI Updates:

    • Refactor existing XML layouts to use dynamic attributes (?attr/colorPrimary, ?attr/colorSurface) rather than hardcoded hex codes.
    • Update the SettingsActivity to include a new "Appearance" menu.

UI/UX Flow:

  1. User opens Settings.
  2. User selects Appearance.
  3. User selects App Theme.
    • Options: System Default, Light, Dark, AMOLED Black.
  4. User selects Custom Skin.
    • Action: File picker opens to select a valid .zip theme file.
    • Result: UI updates immediately; app prompts for a restart if deep asset changes are required.

Acceptance Criteria:

Potential Risks:

Where to get themes

How to Install Themes on Citra Android

The process is straightforward, but exact steps vary slightly between Citra versions (official vs. MMJ).

The theme.json File

Inside every theme folder is a theme.json file. This tells Citra what colors to use. Here is a sample snippet: citra android themes


  "name": "My Custom Theme",
  "primaryColor": "#FF6200EE", // The top bar color
  "accentColor": "#FF03DAC5", // Button highlight color
  "backgroundColor": "#FF121212", // Background of game grid
  "textColorPrimary": "#FFFFFFFF", // Game titles
  "gameGridBackground": "#FF1E1E1E"

You can edit these hex codes. Want a Zelda theme? Change primaryColor to #FF00400 (Hylian Green) and accentColor to #FFC9A03D (Gold).

Skinning as Nostalgia and Utility

Beyond the core UI, the true thematic depth of Citra Android emerges through custom on-screen overlays. Because most Android devices lack physical buttons, Citra uses a virtual skin that maps L, R, Start, Select, and the D-pad to the glass. The themes available for these overlays range from the utilitarian (solid gray buttons with clear labels) to the hyper-nostalgic.

Community-created themes often feature transparent PNGs that mimic the actual 3DS bezel, complete with a simulated camera bump and LED indicators. These "skin themes" serve a dual purpose. Visually, they transform the blank black slab of a phone into a faux-3DS, triggering muscle memory and emotional resonance. Functionally, they use color blocking to reduce input lag perception—a bright yellow button is easier to hit by peripheral vision than a gray one.

Furthermore, the transparency theme (where buttons fade when not in use) speaks to a modern minimalist aesthetic. It argues that the emulator should be invisible, that the only true "theme" is the game ROM itself. This tension—between the ornate, skeuomorphic skin and the sterile, flat overlay—is where Citra Android’s thematic identity lives. Feature Draft: Custom UI Themes for Citra Android

Accessibility & UX tips

Why Use a Custom Theme?

What you need: