Ignore .*.java files when collecting .java files.

Bug: 22934689
Change-Id: I6c9cc8f37d09eb190946e596e5d1ba0c3b318088
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index 0de1837..417d4fd 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -107,7 +107,7 @@
 define prepare-doc-source-list
 $(hide) mkdir -p $(dir $(1))
 $(call dump-words-to-file, $(2), $(1))
-$(hide) for d in $(3) ; do find $$d -name '*.java' >> $(1) 2> /dev/null ; done ; true
+$(hide) for d in $(3) ; do find $$d -name '*.java' -and -not -name '.*' >> $(1) 2> /dev/null ; done ; true
 endef
 
 ifeq (a,b)