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