Personalization of a mobile device has long ceased to be just changing the wallpaper on the desktop. Modern users strive for a total transformation of the interface, affecting every detail of the visual style the operating system. Creating your own theme is not only a way to stand out, but also an excellent reason to dive deeper into the architecture of Android.
The process of developing a unique visual style requires patience, an understanding of how graphical shells work and the availability of certain tools. You can go by simply creating an icon pack or choose a complex route with a complete overhaul of system resources via theming engine. Both methods have their advantages and limitations, which we will discuss in detail below.
In this article we will look at the main steps necessary to make your idea a reality. We'll look at software, file formats, and nuances that new designers often overlook. Are you ready to turn your smartphone into an exclusive device?
Choosing a theming method and the necessary tools
Before you start drawing, you need to decide on the approach to implementing changes. There are two main ways: creating a standard icon pack and using powerful overlay engines such as Substratum. The first option is easier to implement and does not require superuser rights (Root), while the second gives unlimited freedom, but requires an unlocked bootloader.
To work with icons, you will need a graphic editor that supports working with layers and transparency, for example Adobe Photoshop or a free analogue GIMP. Also an indispensable tool will be a specialized application for assembling packages, which will automatically generate the necessary code appfilter.xml. If you plan to change system colors and fonts, you cannot do without Substratum Lite or Synergy It is important to understand that modern versions
It is important to understand that modern versions Android (starting from 9.0 and higher) have significantly limited the ability of third-party applications to change the system interface without obtaining root access. This is done for security purposes so that malware cannot replace critical system elements. Therefore, the choice of method directly depends on whether you are ready to root your device.
⚠️ Attention: Using themeizers like Substratum on untested firmware can lead to a “bootlap” (cyclic reboot). Always have access to Recovery on hand to roll back changes.
Prepare your workspace: make sure you have a stable version Android SDK for emulation or debugging if you plan to develop a full-fledged theme application. For most enthusiasts, a smartphone with an installed launcher that supports custom packages is enough, for example Nova Launcher or Lawnchair.
Preparation of graphic resources and icons
The basis of any theme is graphic elements. The most time-consuming part of the process is drawing application icons. You need to create a unified style that will be recognizable and harmonious. It can be flat design (Flat), material design (Material Design) or something more eccentric, such as neon style or pixel art.
Each icon should be presented in a format PNG with a transparent background. The standard resolution for a basic icon is 192x192 pixels, but it is recommended to work in vector or 512x512 resolution for subsequent scaling without loss of quality. Don't forget to also prepare an icon for the theme application itself, which will be displayed in the smartphone menu.
- 🎨 Determine the color palette: select 3-4 primary colors that will dominate the interface.
- 📐 Follow the grid: all icons should fit into a certain outline (circle, square, rounded square) so that the desktop does not there was visual chaos.
- 🖼️ Prepare placeholders: create a universal placeholder icon for applications for which you have not drawn an individual design.
In addition to application icons, think about the design of system icons: battery, Wi-Fi, network signal and notifications. If you use advanced theming techniques, these elements can also be replaced. However, for a regular icon pack, the focus should be strictly on application launcher shortcuts.
Use ready-made Icon Mask Templates available on the Internet. They will help you quickly outline the outline and maintain a consistent style for hundreds of applications without drawing every square by hand.
Creating a project structure and configuration file
When the graphics are ready, it's time for the technical magic. An Android icon pack is essentially a regular application containing resources and a special configuration file. This file, most often called appfilter.xml, associates the name of the application component (package name) with the name of your graphics file.
The folder structure must strictly comply with the standards Android Studio. Inside the folder res there are subfolders drawable for your pictures and values for resource files. An error in the folder name or file format will result in the theme simply not installing or displaying incorrectly.
<item component="ComponentInfo{com.android.calculator2/com.android.calculator2.Calculator}" drawable="calc_icon" />The code example above shows how the binding occurs. The attribute component indicates a specific application and its activity, and the attribute drawable refers to the file name of your icon without an extension. It is irrational to collect this file manually for thousands of applications, so use automation.
There are online generators and desktop utilities that scan applications installed on your device and allow you to visually match icons to them. After completion of work, such a app will automatically download the finished one XML file, which will only need to be placed in the desired project directory.
Assembling APK and testing on the device
The final stage of creating an icon package is compiling the project into an installation one file .apk. If you work via Android Studio, the process takes a few minutes: just press the Build Bundle(s) / APK(s)button. For those who use mobile theme designers, the process is even simpler - the application itself will pack the resources after clicking the “Export” button.
Install the resulting file on your smartphone. After installation, go to your launcher settings (for example Nova Launcher), find the “Appearance” or “Look & Feel” section and select “Icon Style”. Your new theme should appear in the list. Activate it and carefully inspect the desktop.
| Check element | Expected result | Possible error |
|---|---|---|
| Application icons | All replaced with custom ones | Standard icons are displayed |
| Folders | Icons inside folders match the style | Reset to default values |
| Application menu | Unified visual row | Different size or proportions |
| Plugs | A beautiful default for rare applications | Lack of icon (empty square) |
Pay special attention to applications that you do not added to the filter manually. They should be displayed using your placeholder icon. If the standard system icon is visible instead, it means that the file appfilter.xml has a syntax error or the component name is incorrect.
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Advanced theming through Substratum
If you want to change not only icons, but and the colors of the notification panel, keyboard, settings menu and curtain, you will need a theme for the engine Substratum. This method allows you to apply overlays to system resources, essentially reshaping the interface Android on the fly.
Creating such a theme requires knowledge of the structure of system files. You need to extract the original resources (for example framework-res.apk or Settings.apk), decompile them, replace the color values in the files colors.xml or replace the pictures in the folder drawableand then compile back. This requires skills in working with tools like APKTool.
⚠️ Attention: Interfaces and paths to system files change with each Android update. What worked on Android 10 may cause crashes on Android 13 or 14. Always check the compatibility of overlays with your firmware version.
In the environment Substratum each modification is called an overlay. You can create a theme containing dozens of overlays for different parts of the system. The user will be able to enable them individually or all at once. This gives flexibility, but complicates the testing process, since conflicts between overlays can lead to unstable operation of the device.
What is RRO (Runtime Resource Overlay)?
RRO is a mechanism in Android that allows you to change application resources at runtime without modifying the APK file itself. It is on this technology that most modern theming engines work, providing security and the ability to quickly roll back changes.
Theme publishing and distribution
When the theme is ready, tested and polished, the question arises: how to share it with the world? The most popular way is publication in the store Google Play. However, this requires registering for a developer account (a one-time $25 fee) and following strict moderation rules. Your application must be unique and not violate copyright.
An alternative way is posting on specialized forums, such as XDA Developers, or in Telegram channels dedicated to customization. Here the requirements are softer, and feedback from the community comes faster. You can distribute the theme for free or offer a paid version with an expanded set of icons through services like Gumroad.
Don't forget to create a high-quality description and screenshots. Users should see how the theme looks in real life, not just in mockups. Indicate in the description a list of supported launchers and the minimum version Androidto avoid negative reviews from owners of incompatible devices.
High-quality presentation of the theme is no less important than the icons themselves. Users “buy” with their eyes, so take the time to create beautiful screenshots in different modes (light/dark).
Frequently asked questions and problem solving
Why are some icons not applied after installing the theme?
This happens if the application developer has changed the package name or activity, and this the pair is not registered in your file appfilter.xml. Also check if your launcher supports this theme. Some launchers require renaming resource files to lower case.
Is it possible to create a theme without a computer, only on a smartphone?
Yes, it is possible. There are designer apps such as Icon Pack Studio or Minimalist Phonethat allow you to create simple icon packs directly on your device. However, for deep system theming through Substratum, a computer is still required to decompile system files.
Is it safe to use themes with root access?
Using themes itself is safe if they are downloaded from trusted sources. The risk is an error by the theme developer that could damage the system partition. Always make a backup copy before installing complex system overlays.
How to add dark theme support to your icon pack?
To do this, you need to create a separate resources folder drawable-night and place there versions of icons adapted for a dark background (for example, less contrast or inverted). The Android system will automatically pull them up when night mode is activated.
Why does the theme run slowly on an old smartphone?
Heavy graphic elements and a large number of overlays can load the GPU. Optimize the size of PNG files, use vector graphics (XML) where possible, and avoid complex animations in static themes.