If you meant the TEST-<STUFF>.xml
files with test report, then this is not configurable, refer to https://github.com/jayway/maven-android-plugin/blob/master/src/main/java/com/jayway/maven/plugins/android/standalonemojos/UIAutomatorMojo.java, writeJunitReportToFile()
method (or just search for "TEST-" pattern).
A workaround might be moving the report files with antrun.