diff --git a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
index bce174b..e5cdaab 100644
--- a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
+++ b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
@@ -20,5 +20,6 @@
         findViewById(R.id.fromarray_btn).setOnClickListener(view -> rxProcess.fromArray());
         findViewById(R.id.range_btn).setOnClickListener(view -> rxProcess.range());
         findViewById(R.id.interval_btn).setOnClickListener(view -> rxProcess.interval());
+        findViewById(R.id.timer_btn).setOnClickListener(view -> rxProcess.timer());
     }
 }