diff --git a/app/src/main/java/com/hippo/ehviewer/ui/legacy/MarginItemDecoration.java b/app/src/main/java/com/hippo/ehviewer/ui/legacy/MarginItemDecoration.kt
similarity index 100%
rename from app/src/main/java/com/hippo/ehviewer/ui/legacy/MarginItemDecoration.java
rename to app/src/main/java/com/hippo/ehviewer/ui/legacy/MarginItemDecoration.kt
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/legacy/SimpleSmoothScroller.java b/app/src/main/java/com/hippo/ehviewer/ui/legacy/SimpleSmoothScroller.kt
similarity index 100%
rename from app/src/main/java/com/hippo/ehviewer/ui/legacy/SimpleSmoothScroller.java
rename to app/src/main/java/com/hippo/ehviewer/ui/legacy/SimpleSmoothScroller.kt
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/legacy/WindowInsetsAnimationHelper.java b/app/src/main/java/com/hippo/ehviewer/ui/legacy/WindowInsetsAnimationHelper.kt
similarity index 100%
rename from app/src/main/java/com/hippo/ehviewer/ui/legacy/WindowInsetsAnimationHelper.java
rename to app/src/main/java/com/hippo/ehviewer/ui/legacy/WindowInsetsAnimationHelper.kt