diff --git a/app/src/main/java/com/ray650128/gstreamer_demo_app/MainActivity.java b/app/src/main/java/com/ray650128/gstreamer_demo_app/MainActivity.kt
similarity index 100%
rename from app/src/main/java/com/ray650128/gstreamer_demo_app/MainActivity.java
rename to app/src/main/java/com/ray650128/gstreamer_demo_app/MainActivity.kt