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Gradle is the build system that takes the best features from other build systems (Ant & Maven) and combines them into one. It is a plugin based system.

Gradle-elephant

It builds APK by using all the source files, then applies the appropriate tool (java class into dex file), and group them into a single unit.

Gradle simplifies the following process :

  • Build different flavours or variants of your app
  • Make simple script-like tasks
  • Manage and download dependencies
  • Keystore customization

A Gradle project describes its build in a file called build.gradle located in the root folder of the project. The following snippet shows the simple build file.


buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.0'
    }
}

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "ur app ID"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1600010100
        versionName "1.1.0-alpha"
    }
}

Android build file contains the following 3 main parts

1. buildscript {…}

This block is where you configure the repositories and dependencies for Gradle itself.

repositories {}

This block configures the repositories Gradle uses to search or download the dependencies. Gradle pre-configures support for remote repositories such as JCenter, Maven Central, and Ivy.

dependencies {}

This block configures the dependencies Gradle needs to use to build your project.

2. apply plugin :

       com.android.application : This is the plugin used for building Android applications.

       com.android.library : This is the plugin used for building Android Library.

3. Android configuration :

This is the entry point for the Android DSL (Domain Specific Language). Here you need to configure all the following parameters for the android build:

compileSdkVersion : It specifies the Android API level, Gradle should use to compile your app.

buildToolsVersion : It specifies the version of the SDK build tools.

applicationId : Uniquely identifies the package for publishing.

minSdkVersion : Minimum API level required to run the app.

targetSdkVersion : The API level used to test the app.

versionCode : The version number of your app.

versionName : The version name for your app.

 

 

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Jaison Fernando

Android Developer at NFN Labs
Elsewhere