Many Android users are faced with the need to look “under the hood” of the applications installed on their devices. This may be needed to extract icons, check permissions, study code, or just out of curiosity to understand how a popular app works. The file is essentially an archive similar to ZIP, but has a specific structure optimized for the Dalvik or ART virtual machine. However, standard file managers on smartphones often do not allow you to simply open such a file to view the content, only offering to install it. To access internal files such as manifest, resources, or compiled code, you must use specialized decompression algorithms. In this article, we will look in detail at how to unzip an APK file on Android, what tools are needed for this, and how to avoid common mistakes when manipulating system data. APK is essentially an archive similar to ZIP, but with a specific structure optimized for the Dalvik or ART virtual machine.
However, standard file managers on smartphones often do not allow you to simply open such a file to view the content, only offering to install it. To access internal files such as manifest, resources, or compiled code, you must use specialized decompression algorithms. In this article, we will look in detail at how to unzip an APK file on Android, what tools are needed for this, and how to avoid common mistakes when manipulating system data.
The process of decompilation or unpacking may vary depending on your goals: whether you just want to get a picture or intend to analyze the logic of the application. Android provides flexible options for developers and advanced users, but requires caution when working with other people's code. Let's look at ways to implement this task, from simple to professional.
Understanding the structure of the APK file
Before you start unpacking, it is important to understand what exactly you are dealing with. File APK (Android Package Kit) is a container that includes all the components necessary for the application to work. Inside it are compiled code, resources, certificates and a manifest. Without understanding this structure, attempts to open the file can lead to confusion.
Inside the archive you will find several key directories and files. The folder META-INF contains information about the application signature and manifest, which is critical for system security. The directory lib stores native libraries compiled for specific processor architectures, such as armeabi-v7a or arm64-v8a. There is also a file classes.dexthat represents the application's executable code in Dalvik Executable format.
Application resources, such as images, interface layouts, and string constants, are usually stored in the folder res. However, they are often in an optimized or compressed format that is not always readable by standard viewers without pre-processing. Understanding where everything is will help you quickly find the data you need after unpacking.
⚠️ Warning: Changing files inside the APK, especially the manifest or signatures, will cause the application to no longer install or run on the device.
The simplest method: changing the extension
The most An obvious and quick way to look inside a file is to take advantage of the fact that the APK format is based on the ZIP standard. You don't need to install complex software if your goal is just to look at pictures or text files that have not been heavily compressed or encrypted.
For this you will need any advanced software that allows you to rename files and work with archives. An example of such a tool is file manager, which allows you to rename files and work with archives. An example of such a tool would be Total Commander, Solid Explorer or FX File Explorer. Standard file managers often block renaming of system extensions, so choosing the right tool is critical.
The algorithm of actions is extremely simple. Find the desired file in the device memory, select the rename option and replace the extension .apk to .zip. The system may warn you that the file may become inaccessible - ignore this warning. After changing the extension, the file icon will change and you can open it as a regular archive.
If the file manager does not show file extensions, go to its settings and enable the “Show hidden files and extensions” option.
After opening, you will see the standard folder structure. This method is ideal for retrieving resources, such as application icons or background images, that are often found in a folder res/drawable. However, it will not allow you to read the code or decompile the resources into their original form, since they remain in a binary format.
Using specialized applications for decompression
If simple renaming is not enough and you need to access decompiled resources or code, you will need more powerful tools that run directly on the device. There are applications created specifically for analyzing and extracting APKs on the fly, without the need to connect to a computer.
One of the most popular tools is MT Manager or JADX (in the portable version for Android). These utilities can not only open an archive, but also convert binary XML into readable text, as well as decode resources. This makes it possible to edit configuration files or analyze the logic of the app.
When using such applications, the process is as follows: you open the manager, find the target APK and select the “View” or “Decompile” function. The app will automatically create a temporary directory with unpacked files. You can navigate through the file tree by opening them in the built-in editor.
- 📂 MT Manager —a powerful all-in-one tool for working with APKs that supports editing and resubscribing.
- 🔍 JADX-GUI (port) —great for viewing decompiled Java code in a convenient form.
- 🛠️ Apktool M is a mobile version of a well-known tool for reverse engineering applications.
It is important to note that such applications require permission to access the storage. Without this, they will not be able to save the unzipped files into a folder accessible to you. In addition, the process of decompiling large applications may take several minutes depending on the performance of your smartphone.
Extracting via computer: professional approach
For in-depth analysis, when the power of a smartphone is not enough or the use of complex scripts is required, it is advisable to transfer the file to a personal computer. The PC has large computing resources and allows you to use full-fledged versions of reverse engineering tools, such as Android Studio or console utilities.
The standard set of developer tools includes ADB (Android Debug Bridge) and utility apkanalyzer. With their help, you can not only unpack the file, but also analyze dependencies, size of methods and resource usage. This gives the most complete picture of the internal structure of the application.
To work with code, a bunch of tools are often used: apktool to unpack resources and dex2jar together with JD-GUI to view the code. This method is considered the "gold standard" among security researchers and modders. It allows you to get the source code as close as possible to the original.
The process on a computer looks like this: the APK file is copied to the working directory, after which the unpacking command is executed on the command line. The result is saved in a separate folder, where all files become available for editing in any text editor or IDE.
apktool d application.apk -o output_folderThis command initiates the decompilation process, creating a folder output_folder with all unpacked data. This approach ensures that even complex resources will be processed correctly, unlike mobile applications, which can simplify the procedure for speed.
Content analysis: what can be found inside
After successful unpacking, the project structure will open in front of you. However, just seeing the files is not enough - you need to understand what to do with them. The main objects of interest are usually the manifest, resources, and code. Each of these elements carries important information about the operation of the application.
The file AndroidManifest.xml is the passport of the application. It specifies all the permissions that the app requests, entry points (activities), services and recipients of broadcast messages. Studying this file helps you understand what data the application can receive without the user's knowledge.
The folder res contains visual elements. Here you can find icons in different resolutions, XML screen layouts and color schemes. Often this is where modders take graphics to create their themes or customize the interface. The files in this folder become readable after decompilation.
| Element | Location | Purpose | Format after unpacking |
|---|---|---|---|
| Manifest | Root / META-INF | Configuration and rights | XML (text) |
| Application code | classes.dex | Operation logic | Java / Smali |
| Resources | res/ | Graphics and interfaces | PNG, XML |
| Native libs | lib/ | Low-level functions | .so (binary) |
Application code presented in files .dex, after processing with tools like dex2jar turns into .jar archive. Inside it are .class files that can be opened in the decompiler. You will see code in a language very similar to Java, which allows you to analyze the algorithms of the app.
What is a Smali file?
Smali is an assembly-like language that represents Dalvik bytecode code. It is used by apktool when extracting unless you convert dex to jar. Editing Smali requires deep knowledge of Android architecture.
Security measures and legal aspects
Working with someone else's code and unpacking applications is associated with certain risks that should not be forgotten. First, there is the danger of violating licensing agreements. Most applications are protected by copyright, and modifying them or distributing modified versions may be illegal.
Secondly, if you download decompression tools from unverified sources, you risk infecting your device with malware. Many cracked versions of APK managers contain Trojans that steal data or use the phone for mining. Always check the digital signatures of downloaded utilities.
In addition, modified applications may behave unstable. Removing the license check or changing the operating logic can lead to crashes, data loss, or account blocking by the service developer. Online games with anti-cheat systems are especially sensitive to any changes in APK files.
⚠️ Attention: Using modified applications in online services can lead to permanent blocking of your account by the project administration.
It is also worth considering that some applications use code obfuscation (for example, ProGuard or R8). This makes the decompiled code almost unreadable, turning variable and method names into a meaningless set of characters like a.b.c(). In such cases, the analysis requires the highest qualifications.
Always make a backup copy of the original APK file before starting any manipulations, so that you can roll back changes in case of failure.
Frequently asked questions (FAQ)
Is it possible to unzip an APK without root access?
Yes, absolutely. You don't need root privileges to view content, rename ZIP, or use apps like MT Manager. They are only needed if you want to replace the system application in the section /system/app.
Why does the code look unclear after unpacking?
Most likely, the developer used code obfuscation to protect against reverse engineering. This is a standard practice that replaces friendly class and method names with short, unreadable characters, while maintaining the functionality of the app.
Is it safe to install an unpacked and modified APK?
No, it is not safe. When the file is changed, the developer's digital signature is violated. The Android system will warn about a signature conflict, and the application itself may contain embedded malicious code if you downloaded it from an untrusted source.
How to extract just the icon from an APK?
The easiest way is to rename the file to .zip, open it and go to the folder res/drawable or mipmap. There you will find images of icons in different resolutions, which you can simply copy to your device.