diff --git a/.gitignore b/.gitignore
index 520a863..a78e416 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,3 +53,6 @@ google-services.json
 freeline.py
 freeline/
 freeline_project_description.json
+.idea/vcs.xml
+.idea/caches/build_file_checksums.ser
+*.ser
diff --git a/.idea/caches/build_file_checksums.ser b/.idea/caches/build_file_checksums.ser
index e0a1d72..82a9c23 100644
Binary files a/.idea/caches/build_file_checksums.ser and b/.idea/caches/build_file_checksums.ser differ
diff --git a/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/DefaultAnimation.kt b/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/DefaultAnimation.kt
index 367683f..9742e9e 100644
--- a/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/DefaultAnimation.kt
+++ b/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/DefaultAnimation.kt
@@ -64,20 +64,20 @@ class DefaultAnimation(scrollOrientation: ScrollOrientation, visibleCount: Int)
         return mOutRotation
     }
 
-    override fun doAnimation(movePercent: Float, itemView: View, position: Int) {
+    override fun doAnimation(firstMovePercent: Float, itemView: View, position: Int) {
         val scale: Float
         var alpha = 1.0f
         val rotation: Float
         if (position == 0) {
-            scale = 1 - ((1 - mOutScale) * movePercent)
-            rotation = mOutRotation * movePercent
+            scale = 1 - ((1 - mOutScale) * firstMovePercent)
+            rotation = mOutRotation * firstMovePercent
         } else {
             val minScale = (Math.pow(mScale.toDouble(), position.toDouble())).toFloat()
             val maxScale = (Math.pow(mScale.toDouble(), (position - 1).toDouble())).toFloat()
-            scale = minScale + (maxScale - minScale) * movePercent
+            scale = minScale + (maxScale - minScale) * firstMovePercent
             //只对最后一个 item 做透明度变化
             if (position == mVisibleCount) {
-                alpha = movePercent
+                alpha = firstMovePercent
             }
             rotation = 0f
         }
diff --git a/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/StackLayoutManager.kt b/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/StackLayoutManager.kt
index 5c59f11..a3d1fb5 100644
--- a/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/StackLayoutManager.kt
+++ b/StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/StackLayoutManager.kt
@@ -35,7 +35,7 @@ class StackLayoutManager(scrollOrientation: ScrollOrientation,
     //触发翻页效果的最低 Fling速度
     private var mPagerFlingVelocity = 0
 
-    //标志当前滚动是否是调用{@link #scrollToCenter(Int, RecyclerView, Boolean)}之后触发的滚动
+    //标志当前滚动是否是调用scrollToCenter之后触发的滚动
     private var mFixScrolling = false
 
     //fling的方向，用来判断是前翻还是后翻
@@ -68,7 +68,7 @@ class StackLayoutManager(scrollOrientation: ScrollOrientation,
     /**
      *  设置是否为ViewPager 式翻页模式.
      *  <p>
-     *      当设置为 true 的时候，可以配合{@link #setPagerFlingVelocity(Int)} 设置触发翻页的最小速度.
+     *      当设置为 true 的时候，可以配合[StackLayoutManager.setPagerFlingVelocity]设置触发翻页的最小速度.
      *  @param isPagerMode 这个值默认是 false，当设置为 true 的时候，会有 viewPager 翻页效果.
      */
     fun setPagerMode(isPagerMode: Boolean) {
@@ -85,7 +85,7 @@ class StackLayoutManager(scrollOrientation: ScrollOrientation,
     /**
      * 设置触发ViewPager翻页效果的最小速度.
      * <p>
-     *     该值仅在 {@link #getPagerMode() == true}的时候有效.
+     *     该值仅在 [StackLayoutManager.getPagerMode] == true的时候有效.
      * @param velocity 默认值是2000.
      */
     fun setPagerFlingVelocity(@IntRange(from = 0, to = Int.MAX_VALUE.toLong()) velocity: Int) {
@@ -403,17 +403,8 @@ class StackLayoutManager(scrollOrientation: ScrollOrientation,
 
     private fun getFirstVisibleItemMovePercent(): Float {
         return when (mScrollOrientation) {
-            ScrollOrientation.RIGHT_TO_LEFT -> {
-                return if (width == 0) {
-                    0f
-                } else {
-                    (mScrollOffset % width) * 1.0f / width
-                }
-            }
+            ScrollOrientation.RIGHT_TO_LEFT -> (mScrollOffset % width) * 1.0f / width
             ScrollOrientation.LEFT_TO_RIGHT -> {
-                if (width == 0) {
-                    return 0f
-                }
                 val targetPercent = 1 - (mScrollOffset % width) * 1.0f / width
                 return if (targetPercent == 1f) {
                     0f