compileSdkVersion vs buildToolsVersion in app/build.gradle

compileSdkVersion and buildToolsVersion are two different properties that are used in the build.gradle file of an Android project.

compileSdkVersion specifies the Android API level that your app is compiled against. This means that your app will be compatible with devices that have this version of the Android platform or higher. For example, if you set compileSdkVersion to 30, your app will be compatible with devices running Android 11 or higher.

buildToolsVersion specifies the version of the Android build tools that are used to build your app. These tools include the compiler, linker, and other tools that are used to package your app. The build tools version should match the version of the SDK platform that you are targeting with your app.

Here's an example of how compileSdkVersion and buildToolsVersion might be used in an app-level build.gradle file:

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        // ...
    }
    // ...
}

In this example, the app is compiled against Android API level 30 and the build tools version is 30.0.3.

It's important to keep compileSdkVersion and buildToolsVersion up to date to ensure that your app is compatible with the latest Android platform and build tools features.