If the default plugin configuration does not work for your use-case or you just want to tweak the default behavior you can add the rootCoverage configuration block to your root build.gradle file. The rootCoverage block allows you to tweak certain settings, like whether or not JaCoCo should generate an HTML report, just a CSV file, or maybe even an XML file.

build.gradle (root)

// rootCoverage usually sits somewhere at the bottom of this file,
// on top you would usually have your plugins Gradle block

rootCoverage {

    excludes = ["**/MustBeExcluded.class"]

    generateHtml true
    generateXml false
    generateCsv true

    buildVariant "debug"

    executeUnitTests true
    includeUnitTestResults true
    executeAndroidTests false
    includeAndroidTestResults false
}

The following is a table of all the possible configuration options, in which version of the plugin they have been introduced and what the default value is. Some options are explained in a bit more detail below the table.

Excludes allows filtering certain classes out of the code coverage report.

There are some exclude patterns hardcoded into the plugin that you cannot currently remove:

    "**/AutoValue_*.*", // Filter to remove generated files from: https://github.com/google/auto
    
    // Android Databinding
    "**/*databinding",
    "**/*binders",
    "**/*layouts",
    "**/BR.class", // Filter to remove generated databinding files

    // Core Android generated class filters
    "**/R.class",
    "**/R$*.class",
    "**/Manifest*.*",
    "**/BuildConfig.class",
    "android/**/*.*",

    "**/*\$ViewBinder*.*",
    "**/*\$ViewInjector*.*",
    "**/Lambda$*.class",
    "**/Lambda.class",
    "**/*Lambda.class",
    "**/*Lambda*.class",
    "**/*\$InjectAdapter.class",
    "**/*\$ModuleAdapter.class",
    "**/*\$ViewInjector*.class"

We need to rethink the usage of these hardcoded excludes as some patterns are way too generic, so this may change in the future.

Allows setting a specific Gradle Managed Device as the device that will be used for code coverage, defaults to null in which case the plugin will run tests on all devices (or any device available).