Gradle for Eclipse - Android

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Make Android Eclipse project ready for Android Studio, yet keeping it accessible for Eclipse use too

In short: use src/main/java.

Welcome to raise issue on GitHub.

1. Create project in Eclipse
2. In .classpath change src value into src/main/java, that is
   <classpathentry kind="src" path="src/main/java"/>
   ( Your project has red ! by now)
3. Create folder main/java under src

4. Move source under src/main/java, e.g. move com from src into src/main/java

   

   Now project compiles well.

5. Way 1: add build.gradle, e.g. with such minimal content:

    buildscript {
        repositories {
            mavenCentral()
        }
        dependencies {
            classpath 'com.android.tools.build:gradle:1.1.+'
        }
    }
    apply plugin: 'com.android.application'
   	
    dependencies {
        compile fileTree(dir: 'libs', include: '*.jar', exclude: 'android-support-*.jar')
    }
   	
    android {
        compileSdkVersion 22
        buildToolsVersion "22"
   	
        sourceSets {
            main {
                manifest.srcFile 'AndroidManifest.xml'
                res.srcDirs = ['res']
                assets.srcDirs = ['assets']
            }
   	
            androidTest.setRoot('tests')
        }
    }
   

   Note that with gradle you are to specify buildToolsVersion. If you want to specify for Eclipse ADT (e.g. to make them similar) in project.properties add line like sdk.buildtools=19.1.0. ref

6. Way 2: Right-click on the project Export… -> Android / Generate Gradle build files.

   In wizard select only project (and its dependencies except for Android support libraries)

   This will add build.gradle build file and wrapper files: gradlew, gradlew.bat and gradle/wrapper folder.

   

   Check/correct that your sourceSets section is like below:

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
        }
    }
   

   Hint 1: when you Gradle build file becomes long, define some modules and put them into gradle folder, then inside build.gradle use
   apply from: 'gradle/feature-module.gradle'

   Hint 2: For Eclipse project with dependencies build.gradle will be added in every of them, and main project will get settings.gradle. Instead of Android support library add compile 'com.android.support:appcompat-v7:19.0.+'

7. (optional) If you are using git, add .gitignore with content:

    /gen/
    /bin/
    /.gradle/
    /build/
    /gradle-app.setting	
    .*.md.html	
    .DS_Store
    .idea/workspace.xml
    /local.properties
   

8. In Android Studio File -> Import Project… and select locate build.gradle from the project.

   

Now you can apply power of Gradle in Eclipse with ADT and/or Android Studio

Refs: 1, 2