The visual component of a mobile product plays a decisive role in user perception. An icon is the first thing a potential user sees on Google Play and on the screen of their smartphone. Creating a high-quality graphic image requires not only design skills, but also proper technical integration into the project. If you are a developer, then the question of replacing a standard green robot with a unique logo will arise in front of you already in the early stages of creating Android applications.
The process of introducing new graphics into Android Studio has evolved in recent years. Previously, developers had to manually cut out images of different sizes and put them into folders mipmap. Today, IDEs offer powerful built-in tools that automate routine tasks. However, knowledge of the principles of working with resources remains a critical skill for any engineer who wants to control every pixel of his product.
In this article we will analyze in detail all the stages of replacing an icon: from preparing the source to the final assembly of the APK. We will cover both the use of the classic wizard Image Assetand manual methods of editing the manifest for advanced scenarios.
Preparing graphic resources and requirements
Before opening the development environment, you need to prepare the source image. The quality of the final result directly depends on the quality of the input data. It is recommended to use the vector format SVGas it allows you to scale the image without losing clarity at any screen density.
If vector is not available, use a high-resolution raster image, for example PNG 1024x1024 pixels in size. Different versions of the operating system have their own display rules that must be taken into account when designing.
Modern standards Material Design dictate strict rules of composition. The icon should not contain text that becomes unreadable in a small size. You should also avoid complex details that may “stick together” when reduced.
- 🎨 Use a transparent background for the original image if you plan to add a colored background using studio tools.
- 📐 Maintain a safe zone: important logo elements should be in the center, without touching the edges of the canvas.
- 📱 Consider adaptability: the icon will be displayed differently on older devices and in new launchers.
Use online icon preview generators to see in advance how your logo will look in the round crop that is typical for many launchers.
Don't forget that the final appearance of the icon may depend on the theme of the user's device. A dark system theme may invert colors or require a special version of graphics for contrast.
Using the Image Asset Studio wizard
The most reliable and recommended way to replace an icon is to use the built-in tool Asset Studio. It automatically generates all the necessary resolutions for different screen densities (mdpi, hdpi, xhdpi etc.), saving the developer from manual work.
To launch the wizard, right-click on the folder res in the project window. In the context menu, select path New → Image Asset. A configuration window will open, divided into several tabs, where you can configure the appearance of the resource.
Tab Foreground Layer allows you to upload your image. Here you can select the source type: for built-in icons, for files from disk, or for generating icons from letters. The system will immediately show a preview of how the icon will look in a square and round mask. Clip Art for built-in icons, Image for files from disk or Text to generate icons from letters. The system will immediately show a preview of how the icon will look in a square and round mask.
| Setting parameter | Description of action | Recommended value |
|---|---|---|
Name |
Name of the resource in the code | ic_launcher |
Asset Type |
Type created resource | Launcher Icons (Adaptive and Legacy) |
Padding |
Padding around the image | 25% (for adaptive icons) |
Background Layer |
Color or background image | Color or Image |
Pay special attention to setting the background. Responsive icons separate the background from the foreground, allowing the system to animate them as they interact. You can set a solid color or use a separate image for the background.
After setting all the parameters, click the button Next and then Finish. Android Studio will generate the files and will place them in the appropriate project directories. Old icon files will be overwritten if you used standard names.
Adaptive icons in Android 8.0 and higher
Starting with version Android 8.0 (Oreo), the system introduced the concept of adaptive icons. This allowed device manufacturers to set an arbitrary shape for application icons: a circle, a square, a rounded square, or even a drop.
Technically, an adaptive icon consists of two layers: the front (foreground) and the back (background). These layers are described in a special XML resource file of type mipmap-anydpi-v26. The system dynamically applies a mask on top of these layers depending on the launcher settings.
If you are creating an application targeting modern versions of Android, having an adaptive icon is a mandatory requirement for publication in Google Play. Lack of the correct configuration will result in the icon being displayed on new devices with artifacts or as a gray square.
⚠️ Attention! If you use third-party libraries or plugins to build, make sure they do not overwrite the responsive icon files when compiled.
The file structure for a responsive icon typically looks like this: the main XML file references resources in folders mipmap-anydpi-v26which, in turn, reference specific images or colors. This ensures flexibility and lightness of the application.
What to do if the icon is cropped incorrectly?
Check the padding parameter in Asset Studio. If the image extends beyond the safe zone, increase the padding to 30-40%. Also make sure that important details of the logo are not pressed to the very edge of the source file.
To support older devices (< Android 8.0), the system automatically uses the_legacy_ version of the icon, which is generated by the wizard along with the adaptive one. This ensures that your application is compatible with the entire fleet of devices.
Manual editing of AndroidManifest.xml
Sometimes automatic tools are not enough. For example, if you want to use different icons for different versions of the application (Debug and Release) or implement dynamic icon change. In such cases, direct editing of the manifest file is required.
Open the file AndroidManifest.xml in the root of the project. Find the tag <application>. The attribute android:icon is responsible for the link to the icon resource. By default, the value is indicated there @mipmap/ic_launcher.
<applicationandroid:allowBackup="true"
android:icon="@mipmap/ic_launcher_custom"
android:label="@string/app_name"
.. >
By changing the path to the resource, you can point to any other set of images previously added to the folder res/mipmap. This is often used to create themed versions of an application or icons for specific promotions.
- 🔍 Make sure that the resource name in the attribute
iconexactly matches the name of the folder and files in the directoryres. - 🔄 After changing the manifest, be sure to run the command
Clean Projectto reset the resource cache. - 📂 Check for icon files in all required density folders to avoid compilation errors.
Remember that the attribute android:roundIcon can also be specified separately. If it is missing, the system will try to adapt the main icon, but explicitly specifying the round version gives better control over the result.
Direct editing of the manifest gives complete freedom, but requires manual support of all image resolutions for different screens.
Separation of icons for Debug and Release builds
Professional development implies the presence of several assembly options. Visually distinguishing the debug version (Debug) from the production version (Release) is a good practice and prevents confusion on the developer's or tester's device.
To implement this approach, create separate resource directories for each type of build. In the project structure it looks like src/debug/res i src/release/res. In the folder debug put an icon with a bright marker (for example, a red dot or the inscription "DEV").
When compiling Gradle it will automatically pull resources from the appropriate folder depending on the selected build task. You do not need to change the code or manifest manually - the system itself prioritizes resources from the specific assembly folder over shared resources.
This method is safe and does not increase the size of the final APK, since only resources from the folder release and shared folders will be included in the release version. Debug graphics will be excluded from the final binary file.
⚠️ Attention! Do not store private keys or sensitive data in development build resources if you plan to share APK files for testing.
You can also use mechanisms productFlavors in a file build.gradleif you have different versions of the application (for example, "Free" and "Pro") with completely different branding and icons.
☑️ Setting up different icons
Common errors and ways to solve them
Even when using automatic tools, problems may arise. The most common mistake is ResourceNotFound. It occurs if the resource name in the code does not match the real file or if the file is damaged.
Another problem is incorrect display on devices from different manufacturers. Some shells (MIUI, OneUI, EMUI) have their own icon masking algorithms that can ignore standard adaptability settings. In such cases, testing on real devices helps.
If the icon looks blurry, check the original image. You may be using a raster that is too low resolution. For vector icons (VectorDrawable), make sure that the path complexity does not exceed the rendering limits of older versions of Android.
Why does the icon not change after building?
Most likely, the Gradle or emulator cache was triggered. Try running the command Invalidate Caches / Restart in the File menu. Also, remove the application from your device before reinstalling it, as the launcher may cache the old icon.
Can I use GIF for an icon?
You cannot install an animated icon on the home screen using standard Android tools. Launchers only support static images. Animation is only possible within the application itself or as a widget.
How to return the standard Android icon?
Simply delete the custom files from the mipmap folders and run the Asset Studio wizard again, selecting the standard robot clip art. Or restore files from version control system (Git).
Does icon size affect performance?
Minimally. However, using unoptimized large PNGs (for example, 4000x4000) instead of compressed versions may slightly increase the application startup time and memory footprint.
Do I need to change the icon in the Google Play Console?
Yes, the icon in the project and the icon in the store are different entities. Uploading a new icon in Android Studio does not update it in Google Play. You need to upload a new high-resolution image (512x512) to the developer console manually.