Modern Xiaomi smartphones with a shell MIUI or HyperOS offer ample personalization options, but standard options are often not enough for sophisticated users. Creating your own theme is not just a way to stand out, but also a deep immersion in the architecture of Android systems. If you are wondering how to make a theme on your phone, then get ready to work with file structure and graphics editors, as standard tools of the Themes store here can not do.
The process of developing your own design requires an understanding that the theme is actually an archive with a set of images and a collection of images. XML-The basic structure of the project includes icons, wallpaper, widgets and, most complex, system application styles. You won’t need to be able to program in complex languages, but attention to detail and syntax will be critical at all stages of your work.
Before you start, it’s worth noting that you’ll need a device with unlocked bootloader or superuser rights to test the products you’re creating, although the basic layout can be checked on standard firmware via debugging mode. Xiaomi Theme Editor will be your primary tool for visualizing real-time changes. Below, we’ll take a look at the entire cycle from source preparation to the final compilation of the finished.mtz file.
Preparation of the workplace and tools
The first step is to install specialized software that will take the hard work of compiling resources.The official tool from the developers is called MIUI Theme Editor, and it must be downloaded from the official Xiaomi developer portal (c.mi.com). Once the program is installed, the interface may seem overloaded, but it contains all the necessary tabs to edit the system components.
In addition to the editor, you will need a high-quality graphics editor that supports layering and transparency, such as Adobe Photoshop or the free analog of GIMP. All interface elements should be prepared in PNG format with alpha channel to keep the background transparent where necessary. Also remember to back up data on your device, as experimenting with system themes can sometimes lead to unstable interface operation.
⚠️ Warning: Before you start, be sure to create a restore point or save a standard theme so that in the event of a critical interface failure, you can quickly return to factory settings.
To work with the phone’s file system, especially if you plan to extract resources from system applications, you may need a file manager with access to the root directory, such as a file manager. MT Manager or Root Explorer, these tools will allow you to look inside the system. APK-Files and how to make the original items.
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Use the “Import Existing Theme” feature in MIUI Theme Editor to take the official Xiaomi theme as a base, which will save you time as you don’t have to draw all the icons and elements from scratch, just modify them.
Project structure and main components
Once you start the editor and create a new project, you'll see a tree-like file structure that is the skeleton of your future theme. Understanding the purpose of each folder is the key to successful customization. The main sections are divided into graphical resources (images) and logical files (XML) that describe the behavior of elements.
Special attention should be paid to the description.xml file, which contains metadata of the topic: title, author, version and preview. This file is the first one to be read by the system when installed. Incorrect design of this document can lead to the fact that Xiaomi’s phone will not see the topic or refuse to install it.
Let’s look at the directories you’ll work with most often:
- 📁 Icons – it stores all the icons of applications, from system settings to installed games, requiring individual rendering.
- 🖼️ Wallpaper – folder for lock screen and desktop wallpaper, where it is important to observe the screen resolution of your device.
- ⚙️ The system contains XML-files responsible for status bar colors, notification curtains and settings menu.
- 🔔 Notification – resources for notification icons in the top status bar.
⚠️ Note: When changing the system XML-Excess character or unclosed tag can lead to a bootloop (cyclic reboot) of the launcher interface.
Working with icons and graphic elements
The most extensive part of the job is rendering icons. Unlike launchers on pure Android, the MIUI shell requires replacing each individually icon or using masks. In the theme editor, you can choose a Default Icon template and use it to create a single style for all applications that do not have a personal design.
For high-quality graphics, it is important to know the exact resolutions. Standard icons in MIUI are usually 192x192 pixels in size, but for high-density point screens (HiDPI), it is better to prepare source materials in 256x256 or even 512x512 so that the edges are not lost when zooming.
The process of replacing the icon is as follows: you select the application package in the list, import your own. PNG-You can use the file and you can make changes. If you're doing a theme from scratch, you're going to have to manually go through a list of popular apps like WhatsApp, Telegram, VK System utilities to ensure visual uniformity.
☑️ Schedule checklist
Remember, notification icons are small monochrome images that are displayed in the status bar, and they should be white on a transparent background, usually 24x24 or 48x48 pixels in size, and ignoring this item will cause you to have standard green Android robots hanging in the notification curtain.
Setting up the lock screen and widgets
The Lockscreen is the face of your theme. MIUI Theme Editor has a customizable module that allows you to change the time fonts, date, quick access icons and unlock slider, and you can upload your own images to the background and adjust their behavior when the gyroscope moves (parallax effect).
For advanced users, editing is available XML-It's a lock-screen code that allows you to implement complex logic chains, for example, you can make it so that when the battery is low, the color of the clock numbers changes or there is a warning animation.
Widgets are another important element. The standard MIUI widget set (weather, steps, music) can be styled by changing their background images and font color. In the theme structure, the files in the Widgets folder are responsible for this. By changing the parameters in XML, you can shift the elements inside the widget to make them more compact or, conversely, more informatable.
The Secret of Custom Widgets
Editing System Files and XML
Deep customization is impossible without editing XML-This is where the colors of the interface elements, the transparency of the panels, and the behavior of the animations are written. framework-res.xml or styles.xml (The name may vary depending on the version. MIUI) contains key values of colors in format HEX or RGB.
For example, to change the color of the volume slider or the color of the switches in the settings, you need to find the corresponding element ID and change its color attribute. This requires methodical search, since the names of variables are not always obvious. Often theme developers use the "pump" method or compare their file with the file of the finished theme to find the desired row.
The table below shows the main parameters that most often require changes when creating a topic:
| Parameter | Configuration file | Description of the impact |
|---|---|---|
| Primary Color | colors.xml | The main accent color in the system |
| Status Bar BG | framework-res.xml | Background color of top state line |
| Navigation Bar | framework-res.xml | Color and style of the lower navigation bar |
| Dialog BG | styles.xml | Background of pop-up windows and dialogues |
When editing code, use a syntax-backlit text editor like Notepad++ or VS Code to avoid errors. Even a single missed bracket can make the theme unworkable. After making changes to XML, be sure to check the syntax integrity of the file.
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XML-editing gives you maximum freedom, but it requires a lot of caution. Always make copies of the original files before making edits.
Compilation, testing and installation of the theme
When all graphic elements are replaced and XML-The files are edited, the compilation stage is coming. MIUI Theme Editor press Build or Compile. The program will check the project for errors and, if all goes well, generate a file with the.mtz extension.
There are several ways to install a theme on Xiaomi’s phone without posting it in the official store, the easiest way to rename the file extension from.mtz to.miui and apply the theme through the standard Topics app under Profile or My Topics, but newer versions of HyperOS may block this method.
An alternative and more reliable method is to use ADB (Android Debug Bridge), plug your phone into your computer, enable USB debugging, and use the command to force the theme to be installed, which bypasses region and compatibility checks.
adb push custom_theme.mtz /sdcard/MIUI/theme/
adb shell am start -n com.miui.theme.manager/.activity.ThemeStarterActivityDuring testing, monitor your RAM consumption closely. Too heavy animations and highly detailed wallpaper can cause interface friezes on mid-range and budget devices. Optimizing graphics is an important step in creating a quality theme.
⚠️ Warning: When installing themes from unverified sources or those created with errors, always keep a combination of buttons for login to Recovery Mode on hand to reset settings in case of system freezes.