Xiaomi’s MIUI mobile operating system is known for its deep customization, allowing users to change the look of the interface beyond recognition. However, standard themes available in the official store often can not fully satisfy the needs of advanced users or designers who want to embody a unique concept, which is why creating a custom theme becomes a logical step for those who want to personalize their smartphone 100%.
The process of developing graphic design for MIUI 12 requires not only artistic taste, but also a technical understanding of the structure of the system's files, XML-The configurations and specific compression formats that the shell uses, and although it seems complicated, the basic design can be built with only minimal tools and perseverance.
Before you start, you need to prepare your workplace and make sure that all the tools you need are installed and functioning correctly. In this article, we’ll take you all the way from getting developer rights to finalizing a finished product that you can distribute or use in person. A deep dive into theme architecture will allow you to create truly unique visual solutions.
Necessary tools and environment preparation
The first step to designing your own design is to install specialized software, and the official and most reliable tool is considered to be the most reliable. MIUI Theme Editor, which provides a ready-made folder structure and templates for the basic interface elements. XML-manually take up much more time and would be subject to syntax errors.
In addition to the main editor, you will need a graphics editor that supports transparency and layers, such as Adobe Photoshop or the free analog of GIMP. All icons and background images must be prepared in advance in the correct resolution to avoid stretching or pixelating on the smartphone screen.
☑️ Preparation of the workplace
It is important to understand that MIUI 12 has made significant changes to the rendering of controls compared to previous versions of the shell.
⚠️ Note: Using unofficial or modified versions of Theme Editor may result in an incorrect compilation of the.mtz file, which the system will simply refuse to install.
Registration of Xiaomi Developer Account
To download and test your own themes on the device, it is not enough to download the editor; you need to obtain the appropriate rights in the Xiaomi ecosystem. You will need to register your Mi Account and log in to it on a special developer portal. The verification process can take from several days to a week, as the administration checks the activity of the akka![WIDGET:poll: Which graphic editor do you prefer?:Photoshop|GIMP|Figma|Canva|Another]unt and no violations.
Once you have successfully registered, you will be assigned a unique identifier that you will need to enter into the theme settings inside the MIUI Theme Editor. Without this ID, the project will not be compiled, or the collected theme will be marked as a test and cannot be installed without special permissions, a security measure designed to protect users from malicious code that can theoretically be embedded through the theme files.
It is worth noting that the rules of moderation of topics are quite strict and regularly updated.
Requirements for icons
Project structure and main files
Once you've got access, you need to look at the internal structure of the theme, and the project is a set of folders and files, each of which is responsible for a specific interface element. The central configuration file is description.xml, which describes the paths to resources, versions, titles and authorship, and it's the file that the system reads first when you try to install.
Graphic resources are divided into categories: icons for app icons, images for system images, statusbar for top panel and lockscreen for lock screen. MIUI 12 is characterized by the use of super wallpaper and complex animations, so it is important to properly configure timings and paths to video frames if you plan to change the lock screen.
Below is a table describing the key directories of the standard project:
| Directory | Description of the contents | Importance |
|---|---|---|
| icons | Images of app icons | Critical. |
| images | Background images and textures | Tall. |
| statusbar | Top panel elements (time, battery) | Medium |
| control_center | Control centre design (notifications) | Tall. |
In editing XML-Be extremely attentive to the syntax: one missed closing tag can lead to a “bootloop” (cyclic reboot) of the device.
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Always back up the original theme before making changes to the system configuration files.
Working with icons and graphics
Creating icons is the most time-consuming process, requiring artistic skills. MIUI 12 uses an adaptive icon system, so it is recommended to draw graphics on canvas measuring at least 192x192 pixels, leaving a safe area at the edges. The system itself will trim the extra depending on the shape chosen by the user, but critical elements should remain in the center.
To replace the standard icons, you need to create files with names corresponding to the application packages (for example, com.android.contacts.png).
If the file name does not match the packet name, the icon will not apply.
There are special match maps (icon mapping) that help you find the right names for hundreds of popular apps.
- 🎨 Use vector graphics where possible to scale without loss of quality.
- 📐 Follow a uniform style: if the icons are flat, do not add sharp shadows to only some of them.
- 📁 Group icons by color or functionality for easy navigation in the editor.
Pay special attention to the icons of system applications, as they have priority and often overlap third-party settings.
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Use a Photoshop plugin or script that automatically renames icon files to match the Android package database, this will save you hours of manual work.
setting up the lock screen and
Lock screen in MIUI 12 has undergone significant changes, with support for depth of field and complex unlock animation. Theme Editor has a separate module to work with it, allowing you to position the clock, date and widgets. You can change fonts, colors and even add your own GIF-animations that will be played when the screen is activated.
The Control Center, which was put in a separate curtain in this version of the shell, is also customizable. You can change the transparency of the plates, the color of the volume and brightness sliders, and the icons of the switches. But here it is important to balance beauty and readability: elements must remain visible against any background.
⚠️ Warning: Excessive animated elements on the lock screen can significantly increase battery consumption and cause micro-freeze interfaces on mid-segment devices.
When setting your watch, use the <clock> and <date> tags, specifying the coordinates X and Y.
Don’t forget to check what your changes look like when you turn on “dark theme” as colors can invert in unpredictable ways.
Compilation, installation and debugging
Once all the graphics and code edits are complete, the project build phase begins. From the editor menu, select the option "Compile" or "Build", which will result in a file with the.mtz extension. This file is a ready-made theme that can be transferred between devices. It is recommended to check the file with antivirus before installation, although the Xiaomi editor usually sifts out critical errors.
There are several ways to install a theme on a smartphone. The easiest way to connect the device is to USB And you can use the built-in "Install to device" function in the editor, and if you're working remotely, you can upload the.mtz file over the cloud or messenger and then open it through the standard Themes app, and the system will request confirmation of the installation from an unknown source (your account).
- 🔄 If after installation the theme is not fully applied, try to clear the cache of the application "Themes".
- 📱 Check the theme at different screen resolutions if you have access to multiple models.
- 🐛 If errors occur, look for logs in the folder /data/log device-wise.
During debugging, you may encounter a situation where some elements are displayed incorrectly.