How to configure the order of libraries in the classpath for Android Studio?

Question

I would like to change the order of libraries in the classpath for Android Studio. I am trying to run unit tests with JUnit 4 from within the IDE

Answer 1

You have to modify the project .iml file to have the JDK as the last entry like the following:

    <orderEntry type="library" 
                exported="" 
                scope="TEST" 
                name="wagon-provider-api-1.0-beta-6" 
                level="project" />
    <orderEntry type="library" 
                exported="" 
                scope="TEST" 
                name="xercesMinimal-1.9.6.2" 
                level="project" />
    <!-- make sure this is the last orderEntry -->
    <orderEntry type="jdk" 
                jdkName="Android API 19 Platform" 
                jdkType="Android SDK" /> 
  </component>
</module>

For a full working example see Robolectric's deckard-gradle sample.

Answer 2

I use the following task to make sure that the SDK dependency is listed last:

task pushDownJdkDependency {
    def imlFile = file("ui.iml")
    doLast {
        try {
            def parsedXml = (new XmlParser()).parse(imlFile)
            def jdkNode = parsedXml.component[1].orderEntry.find { it.'@type' == 'jdk' }

            parsedXml.component[1].remove(jdkNode)
            new Node(parsedXml.component[1], 'orderEntry', ['type': 'jdk', 'jdkName': "Android API 18 Platform", 'jdkType': 'Android SDK'])
            def writer = new StringWriter()
            new XmlNodePrinter(new PrintWriter(writer)).print(parsedXml)
            imlFile.text = writer.toString()

        } catch (FileNotFoundException e) {
            // nop, iml not found
        }
    }
}

make sure you use the correct SDK identifier. Then hook the task into the build process:

gradle.projectsEvaluated {
    preBuild.dependsOn(pushDownJdkDependency)
}

Other than that, add the task to your run configuration. Unfortunately I cannot post images due to lack of reputation.