# Introduction to SMALI

## 📌What is SMALI?

* **SMALI** is the assembly-level language used in the Android operating system to represent the Dalvik bytecode, which is executed by the Dalvik Virtual Machine (DVM) or Android Runtime (ART). It’s the human-readable format of the compiled classes within an Android application package (`.apk`).
* ***File Format:***
  * SMALI files have a `.smali` extension.
  * Each `.smali` file corresponds to a single class in the app, with a structure similar to Java's, but in assembly-like syntax.
* ***Uses**:*
  * **Reverse Engineering**: Understanding how an app works or modifying its behavior.
  * **Security Testing**: Analyzing apps for vulnerabilities or malicious code.
  * **Debugging**: Making minor fixes or changes directly in SMALI.

### 📌How can we extract SMALI code from an App?

* **Using APKTool** (Recommended Approach):
  1. Decompile the APK using the following command:

     ```bash
     apktool d app.apk
     ```
  2. Once decompiled, you'll find a `smali` directory corresponding to the package name.
* **Using JADX-GUI**:
  1. Open the APK in **jadx-gui**:

     ```bash
     jadx-gui app.apk
     ```
  2. Click the **SMALI** button to view the SMALI code.

***


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