android coverage task

task codeCoverageReport(type: JacocoReport, dependsOn: 'testStagingDebugUnitTest') {
    group = "Reporting"
    description = "Generate Jacoco coverage reports after running tests."
    reports {
        xml.enabled = true
        html.enabled = true
    }
    classDirectories = fileTree(
            dir: 'build/intermediates/classes/staging/debug/com/yourpackage',
            excludes: androidExclusion
    )
    sourceDirectories = files('src/main/java/yourpackage')
    executionData = files('build/jacoco/testStagingDebugUnitTest.exec')
}

task getCoverage(type: Exec, dependsOn: 'codeCoverageReport') {
    group = "Reporting"
    commandLine "open", "$buildDir/reports/jacoco/codeCoverageReport/html/index.html"
}