diff --git a/app/src/main/java/org/ntlab/amaryllis/client/VoiceActivity.java b/app/src/main/java/org/ntlab/amaryllis/client/VoiceActivity.java
new file mode 100644
index 0000000..4b3b561
--- /dev/null
+++ b/app/src/main/java/org/ntlab/amaryllis/client/VoiceActivity.java
@@ -0,0 +1,4 @@
+package org.ntlab.amaryllis.client;
+
+class VoiceActivity {
+}