diff --git a/UltimateAndroidGradle/demoofui/src/main/java/com/marshalchen/common/demoofui/activityanimation/ActivityAnimationsActivity.java b/UltimateAndroidGradle/demoofui/src/main/java/com/marshalchen/common/demoofui/activityanimation/ActivityAnimationsActivity.java
index 09af1252..61b12250 100644
--- a/UltimateAndroidGradle/demoofui/src/main/java/com/marshalchen/common/demoofui/activityanimation/ActivityAnimationsActivity.java
+++ b/UltimateAndroidGradle/demoofui/src/main/java/com/marshalchen/common/demoofui/activityanimation/ActivityAnimationsActivity.java
@@ -73,7 +73,7 @@ private void findViews() {
     }
 
     @Override
-    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {    //RadiozGroup的回调，监听checked change
         int id = buttonView.getId();
         if(id == R.id.random_anim && isChecked) {
             mAnimationType = AnimatedRectLayout.ANIMATION_RANDOM;