How to put my libraries in front of android.jar by editing build.gradle in Android-Studio

Question

First Here\'s my Java Build Path in Eclipse:

These four jars \'common.jar,core

Answer 1

A updated and somewhat more future-proof answer (since bootclasspath compilerargs have been changing in more recent JDKs):

• Supposing you have taken system libraries like framework.jar and libcore.jar from aosp intermediates (generated when building aosp) and added them into a folder (such as system_libs) in your project, add the libraries to the compile classpath in build.gradle:

dependencies {
    compileOnly fileTree(dir: 'system_libs', include: ['*.jar'])
}

gradle.projectsEvaluated {
    tasks.withType(JavaCompile) {
        options.bootstrapClasspath = files(
            new File("./system_libs/framework.jar").path,
            new File("./system_libs/libcore.jar").path
        )
    }
}

• Add a task to put referring to the Android API Platform in the last position in app.iml, this way gradle will take into account your system libs first and Android SDK last:

preBuild {
    doLast {
        def imlFile = file(project.name + ".iml")
        println 'Change ' + project.name + '.iml order'
        try {
            def parsedXml = (new XmlParser()).parse(imlFile)
            def jdkNode = parsedXml.component[1].orderEntry.find { it.'@type' == 'jdk' }
            parsedXml.component[1].remove(jdkNode)
            def sdkString = "Android API " + android.compileSdkVersion.substring("android-".length()) + " Platform"
            new Node(parsedXml.component[1], 'orderEntry', ['type': 'jdk', 'jdkName': sdkString, 'jdkType': 'Android SDK'])
            groovy.xml.XmlUtil.serialize(parsedXml, new FileOutputStream(imlFile))
        } catch (FileNotFoundException e) {
            // nop, iml not found
        }
    }
}

Based on @Bertrand's answer