Hello,
I am trying to use the checkstyle plugin, following the documentation (https://docs.gradle.org/current/userguide/checkstyle_plugin.html).
It says to simply add apply plugin: 'checkstyle' to the build script, and a few tasks should be added to the project (e.g. “checkStyleMain”).
In my case, after I add the line and run ./gradlew tasks, I don’t get those new tasks.
Is there something I am missing?
You also need the java plugin.
Oh, you’re right. I did not expect that, for an Android project. Thanks! 
But then it is supposed to get the checkstyle.xml located in rootDir/config/checkstyle/checkstyle.xml, right? Because it doesn’t seem to apply anything in my case (I have indentations with 2, 3 and 4 spaces, and the checkstyle.xml says “2”).
Moreover, gradle output says :checkstyleMain NO-SOURCE =/
Well, I am not sure it is actually right to add the java plugin to an android project. I could make checkstyle run, but without the gradle checkstyle plugin (i.e. by creating a task manually that is getting checkstyle from com.puppycrawl.tools:checkstyle:7.8.1).
It is still very unclear to me how to use checkstyle with Android correctly.