diff --git a/app/src/main/java/com/hippo/ehviewer/preference/CleanRedundancyPreference.java b/app/src/main/java/com/hippo/ehviewer/preference/CleanRedundancyPreference.kt
similarity index 100%
rename from app/src/main/java/com/hippo/ehviewer/preference/CleanRedundancyPreference.java
rename to app/src/main/java/com/hippo/ehviewer/preference/CleanRedundancyPreference.kt
diff --git a/app/src/main/java/com/hippo/ehviewer/preference/TaskPreference.java b/app/src/main/java/com/hippo/ehviewer/preference/TaskPreference.kt
similarity index 100%
rename from app/src/main/java/com/hippo/ehviewer/preference/TaskPreference.java
rename to app/src/main/java/com/hippo/ehviewer/preference/TaskPreference.kt