diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/MiScaleLib.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/MiScaleLib.kt
similarity index 100%
rename from android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/MiScaleLib.java
rename to android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/MiScaleLib.kt
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneLib.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneLib.kt
similarity index 100%
rename from android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneLib.java
rename to android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneLib.kt
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneNewLib.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneNewLib.kt
similarity index 100%
rename from android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneNewLib.java
rename to android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/OneByoneNewLib.kt
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/SoehnleLib.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/SoehnleLib.kt
similarity index 100%
rename from android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/SoehnleLib.java
rename to android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/SoehnleLib.kt
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/TrisaBodyAnalyzeLib.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/TrisaBodyAnalyzeLib.kt
similarity index 100%
rename from android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/TrisaBodyAnalyzeLib.java
rename to android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/TrisaBodyAnalyzeLib.kt
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/YunmaiLib.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/YunmaiLib.kt
similarity index 100%
rename from android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/YunmaiLib.java
rename to android_app/app/src/main/java/com/health/openscale/core/bluetooth/libs/YunmaiLib.kt