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What is Android?

Android, the widely popular operating system, is the beating heart behind millions of smartphones and tablets globally. Developed by Google, Android is an open-source platform that powers a diverse range of devices, offering users an intuitive and customizable experience. With its user-friendly interface, Android provides easy access to a plethora of applications through the Google Play Store, catering to every need imaginable. From social media and gaming to productivity and entertainment, Android seamlessly integrates into our daily lives, ensuring that the world is at our fingertips. Whether you're a tech enthusiast or a casual user, Android's versatility and accessibility make it a cornerstone of modern mobile technology.

Android Implementation vs Compile: Key Differences Explained

Table of Contents

  1. Introduction
  2. What is Implementation in Android?
  3. What is Compile in Android?
  4. Key Differences Between Implementation and Compile
    • Purpose and Usage
    • Dependency Resolution
    • Build Process
    • Impact on Final Build
  5. When to Use Implementation and Compile
  6. Pros and Cons of Implementation
  7. Pros and Cons of Compile
  8. Conclusion

1. Introduction

When working with Gradle in Android development, managing dependencies is crucial for building and maintaining an app. In the world of Android development, we often come across two important terms when dealing with dependencies: implementation and compile. These configurations are used in Gradle files to declare the libraries and modules that your Android project relies on. However, there are distinct differences between the two, particularly when it comes to how dependencies are included during the build process.

In this article, we will explore the key differences between implementation and compile in Android, what they do, when to use them, and how they affect the build process.

2. What is Implementation in Android?

In Gradle, implementation is a configuration used to declare dependencies that are required both at compile time and runtime. These dependencies are bundled into the final build (APK or AAB) and are essential for the app’s functionality.

Using implementation allows Gradle to manage your dependencies in such a way that they are available to your code during compilation and at runtime. Gradle will also make sure to exclude unnecessary dependencies from the compile classpath of other modules, which improves the build speed.

Example of using implementation:

dependencies {
    implementation 'com.squareup.retrofit2:retrofit:2.9.0' // Required at compile and runtime
    implementation 'androidx.lifecycle:lifecycle-viewmodel:2.3.0' // Required at compile and runtime
}

In the above example, Retrofit and ViewModel are core dependencies needed to make networking and lifecycle management work in the app.

3. What is Compile in Android?

The compile configuration was used in older versions of Gradle to declare dependencies that were required for both compile time and runtime. However, compile was deprecated starting from Gradle 3.0 and is no longer recommended for use in modern Android development.

In the past, the compile keyword worked in a similar way to implementation, where dependencies declared using compile would be included in the build during both compile time and runtime. However, it did not have the same optimizations for build performance as implementation does.

Due to its deprecation and the performance improvements offered by implementation, it’s best to use implementation instead of compile in modern Android projects.

Example (Deprecated):

dependencies {
    compile 'com.squareup.retrofit2:retrofit:2.9.0'  // Deprecated, use 'implementation'
    compile 'androidx.lifecycle:lifecycle-viewmodel:2.3.0'  // Deprecated, use 'implementation'
}

4. Key Differences Between Implementation and Compile

Now that we understand the basic definitions of implementation and compile, let’s break down their key differences:

Purpose and Usage

  • implementation:

    • Used for dependencies that are required both at compile time and runtime.
    • Introduces improvements in build speed by excluding dependencies from other modules.
    • Part of Gradle's recommended dependency management system for modern Android development.

  • compile:

    • Was used in older versions of Gradle to declare dependencies required both at compile time and runtime.
    • Does not include the build speed optimizations present in implementation.
    • Has been deprecated in Gradle 3.0 and should be avoided in modern Android development.

Dependency Resolution

  • implementation:
    • Dependencies declared with implementation are only available to the module where they are declared.
    • Other modules that depend on this module will not automatically include the implementation dependencies in their classpath.
  • compile:
    • Dependencies declared with compile were available to all dependent modules (transitive dependencies).
    • This often led to longer build times and potential dependency conflicts.

Build Process

  • implementation:
    • Improves build performance by excluding unnecessary dependencies from the compile classpath of other modules.
    • Gradle only includes the dependencies in the final APK or AAB if they are required by the module.
  • compile:
    • Dependencies were included in every module’s compile classpath (including modules that didn’t need them), which resulted in longer build times.

Impact on Final Build

  • implementation:
    • The dependencies are included in the final build (APK or AAB) only if they are needed.
    • Ensures that the dependencies are optimized for the final package, reducing unnecessary bloat.
  • compile:
    • Dependencies were always included in the final build, even if they weren’t necessary for certain modules, resulting in larger APK sizes and slower builds.

5. When to Use Implementation and Compile

Since compile is deprecated, it’s best to use implementation in your Android projects. However, let’s break down some use cases:

  • Use implementation when:

    • You need dependencies that are required for both compile time and runtime.
    • You want to ensure that dependencies are not included unnecessarily in other modules' classpaths.
    • You need to optimize the build speed and reduce APK size.

  • Use compile when (Not Recommended):

    • You should not use compile anymore, as it is deprecated in Gradle 3.0 and has been replaced by implementation. If you are maintaining older projects, it’s best to migrate to implementation.

6. Pros and Cons of Implementation

Pros:

  • Build speed optimization: Only includes dependencies that are needed, reducing compile times.
  • Better dependency resolution: Prevents unnecessary dependencies from being included in other modules, reducing bloat.
  • Recommended for modern Android projects: Works well with modern Android dependency management practices.

Cons:

  • Requires Gradle 3.0+: Not available in older versions of Gradle, so you must ensure your project uses a newer version.
  • May require migration: If you are working with legacy code that uses compile, you will need to refactor it.

7. Pros and Cons of Compile

Pros:

  • Simple usage: Was easy to use in earlier versions of Gradle.
  • Transitive dependencies: Automatically included in dependent modules, reducing the need to declare dependencies in each module.

Cons:

  • Deprecated: compile is now deprecated in Gradle 3.0, and its use is discouraged.
  • Slower builds: Included dependencies in every module, which led to longer build times and larger APKs.
  • Risk of dependency conflicts: Could introduce unwanted dependencies into other modules, leading to potential version conflicts.

8. Conclusion

In summary, implementation is the modern, recommended way to declare dependencies that are required for both compile time and runtime in Android projects. It helps with build performance optimization, reduces APK size, and resolves dependencies more efficiently.

compile, on the other hand, was a configuration used in older versions of Gradle but has been deprecated starting from Gradle 3.0. While it worked similarly to implementation, it had significant downsides, such as slower builds, larger APKs, and potential dependency conflicts.

If you are working with modern Android development practices, always use implementation to declare dependencies, and avoid using compile as it has been replaced by implementation. The transition from compile to implementation is part of a larger movement toward better dependency management and faster builds in Android development.