A gradle task that can ignore certain packages from test coverage such as models

JacocoTestReport

// packages to exclude for example generated classes, R class and models package, add all packages that you wish to exclude from test coverage
def fileFilter = [
        '**/models/**',
        '**/*$ViewInjector*.*','**/*$ViewBinder*.*',
        '**/R.class', '**/R$*.class', '**/BuildConfig.*',
        '**/Manifest*.*', '**/*Test*.*', 'android/**/*.*']
def debugTree = fileTree(dir: "${buildDir}/intermediates/classes/debug", excludes: fileFilter)
def mainSrc = "${project.projectDir}/src/main/java"

// override jacocTestReport task 
task jacocoTestReport(type: JacocoReport, overwrite: true, dependsOn: 'test') {
    group = "Reporting"
    reports {
        html.enabled = true
        html.destination = "${buildDir}/reports/jacoco"
    }

    sourceDirectories = files([mainSrc])
    classDirectories = files([debugTree])
    executionData = files("${buildDir}/jacoco/testDebugUnitTest.exec")
}

Sonar test coverage property

// define packages that you wish to exclude from sonar test coverage report here it eclude the models package and all sub packages 
property "sonar.coverage.exclusions", "**/models/**/*,**/ANY_OTHER_PACKAGE/**/*"