New in version 3.4.
Set the Android property that defines the Java source code root directories. This a string property that contains the directory paths separated by semicolon. This property is initialized by the value of the CMAKE_ANDROID_JAVA_SOURCE_DIR variable if it is set when a target is created.
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https://cmake.org/cmake/help/v3.19/prop_tgt/ANDROID_JAVA_SOURCE_DIR.html