Jacoco reports for unit tests in android studio

coverage_report.gradle

apply plugin: 'jacoco'

task jacocoTestReport(type: JacocoReport, dependsOn: "testDebug") {
    reports {
        xml.enabled false
        csv.enabled false
        html {
            enabled true
            destination "${buildDir}/jacocoHtml"
        }
    }

    classDirectories = fileTree(
            dir:'build/intermediates/classes/debug',
            excludes: [
                    '**/R.class',
                    '**/R.*',
                    '*/R$.class',
                    '*/BuildConfig.',
                    '*/Manifest.*',
                    '*/*Activity.*',
                    '*/*Fragment.*',
                    '**/*$ViewInjector*.*',
                    'com/google/**',
                    'android/support/**'
            ]
    )
    sourceDirectories = files(['src/main/java'])
    executionData = files('build/jacoco/testDebug.exec')
}