diff --git a/app/src/main/java/com/ccb/arcselect/ui/ArcSelectActivity.java b/app/src/main/java/com/ccb/arcselect/ui/ArcSelectActivity.java
index 873e61806d7b12fca19b87b58d8c87ab594e39fb..65b85ba7e3521c2396ece321bfaac02bb65bb4a5 100644
--- a/app/src/main/java/com/ccb/arcselect/ui/ArcSelectActivity.java
+++ b/app/src/main/java/com/ccb/arcselect/ui/ArcSelectActivity.java
@@ -19,6 +19,7 @@ import android.widget.ImageView;
 import android.widget.TextView;
 
 import com.ccb.arcselect.R;
+import com.ccb.arcselect.utils.CenterItemUtils;
 import com.ccb.arcselect.utils.TUtils;
 import com.ccb.arcselect.utils.UiUtils;
 import com.ccb.arcselect.view.MatrixTranslateLayout;
@@ -28,6 +29,7 @@ import java.util.List;
 
 /**
  * 矩阵实现弧形列表  &&   滑动后自动选中居中的条目
+ * 未使用精确计算居中
  */
 public class ArcSelectActivity extends AppCompatActivity {
 
@@ -86,6 +88,7 @@ public class ArcSelectActivity extends AppCompatActivity {
     }
 
     private boolean isTouch = false; //用户主动触摸后的标记
+    private List<CenterItemUtils.CenterViewItem> centerViewItems = new ArrayList<>();
 
     private void findView() {
         mAdapter = new MAdapter();
@@ -106,8 +109,18 @@ public class ArcSelectActivity extends AppCompatActivity {
                         int centerPositionDiffer = (la - fi) / 2;
                         int centerChildViewPosition = fi + centerPositionDiffer;
 
-                        centerChildViewPosition = centerChildViewPosition < childViewHalfCount ? childViewHalfCount : centerChildViewPosition;
-                        centerChildViewPosition = centerChildViewPosition < mAdapter.getItemCount() - childViewHalfCount -1 ? centerChildViewPosition : mAdapter.getItemCount() - childViewHalfCount -1;
+                        centerViewItems.clear();
+                        //遍历循环，获取到和中线相差最小的条目索引(精准查找最居中的条目)
+                        if (centerChildViewPosition != 0){
+                            for (int i = centerChildViewPosition -1 ; i < centerChildViewPosition+2; i++) {
+                                View cView = recyclerView.getLayoutManager().findViewByPosition(i);
+                                int viewTop = cView.getTop()+(cView.getHeight()/2);
+                                centerViewItems.add(new CenterItemUtils.CenterViewItem(i ,Math.abs(centerToTopDistance - viewTop)));
+                            }
+
+                            CenterItemUtils.CenterViewItem centerViewItem = CenterItemUtils.getMinDifferItem(centerViewItems);
+                            centerChildViewPosition = centerViewItem.position;
+                        }
                         scrollToCenter(centerChildViewPosition);
                     }
                 }
diff --git a/app/src/main/java/com/ccb/arcselect/ui/ArcSelectRotateActivity.java b/app/src/main/java/com/ccb/arcselect/ui/ArcSelectRotateActivity.java
index be81a82b1e66592305cc45104965cfaa8ac60837..f204ed70a366eef76e19616ff2c9a8dffed446c0 100644
--- a/app/src/main/java/com/ccb/arcselect/ui/ArcSelectRotateActivity.java
+++ b/app/src/main/java/com/ccb/arcselect/ui/ArcSelectRotateActivity.java
@@ -30,6 +30,7 @@ import java.util.List;
 
 /**
  * 矩阵实现弧形列表  &&   滑动后自动选中居中的条目   &&  图片跟随旋转
+ * 未使用精确计算居中条目 ， 可以参考CenterItemUtils类 ， 或其它选中居中的界面的实现
  */
 public class ArcSelectRotateActivity extends AppCompatActivity {
 
diff --git a/app/src/main/java/com/ccb/arcselect/ui/AutoSelectActivity.java b/app/src/main/java/com/ccb/arcselect/ui/AutoSelectActivity.java
index 1455240e7ad9713fa6d5da050624cc660c50ee2e..1e89a7f04425f8ff7e9b5128770f889aac2f2f34 100644
--- a/app/src/main/java/com/ccb/arcselect/ui/AutoSelectActivity.java
+++ b/app/src/main/java/com/ccb/arcselect/ui/AutoSelectActivity.java
@@ -18,6 +18,7 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import com.ccb.arcselect.R;
+import com.ccb.arcselect.utils.CenterItemUtils;
 import com.ccb.arcselect.utils.TUtils;
 import com.ccb.arcselect.utils.UiUtils;
 
@@ -90,7 +91,7 @@ private TextView tv;
 
     private boolean isTouch = false;
 
-    private List<CenterViewItem> centerViewItems = new ArrayList<>();
+    private List<CenterItemUtils.CenterViewItem> centerViewItems = new ArrayList<>();
     private void findView() {
         mAdapter = new MAdapter();
         recyclerView.setAdapter(mAdapter);
@@ -117,10 +118,10 @@ private TextView tv;
                             for (int i = centerChildViewPosition -1 ; i < centerChildViewPosition+2; i++) {
                                 View cView = recyclerView.getLayoutManager().findViewByPosition(i);
                                 int viewTop = cView.getTop()+(cView.getHeight()/2);
-                                centerViewItems.add(new CenterViewItem(i ,Math.abs(centerToTopDistance - viewTop)));
+                                centerViewItems.add(new CenterItemUtils.CenterViewItem(i ,Math.abs(centerToTopDistance - viewTop)));
                             }
 
-                           CenterViewItem centerViewItem = getMinDifferItem(centerViewItems);
+                            CenterItemUtils.CenterViewItem centerViewItem = CenterItemUtils.getMinDifferItem(centerViewItems);
                             centerChildViewPosition = centerViewItem.position;
                         }
 
@@ -241,41 +242,4 @@ private TextView tv;
             }
         }
     }
-
-
-    /**
-     * 计算距离中间最近的一个ItemView
-     * @param itemHeights
-     * @return
-     */
-    private static CenterViewItem getMinDifferItem(List<CenterViewItem> itemHeights){
-        CenterViewItem minItem = itemHeights.get(0); //默认第一个是最小差值
-        for (int i = 0; i < itemHeights.size(); i++) {
-            //遍历获取最小差值
-            if (itemHeights.get(i).differ <= minItem.differ){
-                minItem = itemHeights.get(i);
-            }
-        }
-        return minItem;
-    }
-
-//    public static void main(String[] a){
-//
-//        CenterViewItem i = getMinDifferItem(Arrays.asList(
-//                new CenterViewItem(2 , 39)
-//                ,new CenterViewItem(3 , 3)
-//                ,new CenterViewItem(1 , 9)
-//                ,new CenterViewItem(4 , 449)));
-//       System.out.println("position:"+i.position+"   height:"+i.differ);
-//    }
-
-    static class CenterViewItem{
-        public CenterViewItem(int position, int differ) {
-            this.position = position; //当前Item索引
-            this.differ = differ; //当前item和居中位置的差值
-        }
-
-        public int position;
-        public int differ;
-    }
 }
diff --git a/app/src/main/java/com/ccb/arcselect/ui/HorizontalSelectActivity.java b/app/src/main/java/com/ccb/arcselect/ui/HorizontalSelectActivity.java
index f7dc5801170deb88b06b819b64fc811deaa1b785..597225373b2364492a0f50bcc1cadc1b157d4a7f 100644
--- a/app/src/main/java/com/ccb/arcselect/ui/HorizontalSelectActivity.java
+++ b/app/src/main/java/com/ccb/arcselect/ui/HorizontalSelectActivity.java
@@ -19,6 +19,7 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.ccb.arcselect.R;
+import com.ccb.arcselect.utils.CenterItemUtils;
 import com.ccb.arcselect.utils.TUtils;
 import com.ccb.arcselect.utils.UiUtils;
 
@@ -91,7 +92,7 @@ private final int CHILDVIEWSIZE = 100;
 
     private boolean isTouch = false;
 
-    private List<CenterViewItem> centerViewItems = new ArrayList<>();
+    private List<CenterItemUtils.CenterViewItem> centerViewItems = new ArrayList<>();
     private void findView() {
         mAdapter = new MAdapter();
         recyclerView.setAdapter(mAdapter);
@@ -118,10 +119,10 @@ private final int CHILDVIEWSIZE = 100;
                             for (int i = centerChildViewPosition -1 ; i < centerChildViewPosition+2; i++) {
                                 View cView = recyclerView.getLayoutManager().findViewByPosition(i);
                                 int viewLeft = cView.getLeft()+(cView.getWidth()/2);
-                                centerViewItems.add(new CenterViewItem(i ,Math.abs(centerToLiftDistance - viewLeft)));
+                                centerViewItems.add(new CenterItemUtils.CenterViewItem(i ,Math.abs(centerToLiftDistance - viewLeft)));
                             }
 
-                           CenterViewItem centerViewItem = getMinDifferItem(centerViewItems);
+                            CenterItemUtils.CenterViewItem centerViewItem = CenterItemUtils.getMinDifferItem(centerViewItems);
                             centerChildViewPosition = centerViewItem.position;
                         }
 
@@ -231,41 +232,4 @@ private final int CHILDVIEWSIZE = 100;
             }
         }
     }
-
-
-    /**
-     * 计算距离中间最近的一个ItemView
-     * @param itemHeights
-     * @return
-     */
-    private static CenterViewItem getMinDifferItem(List<CenterViewItem> itemHeights){
-        CenterViewItem minItem = itemHeights.get(0); //默认第一个是最小差值
-        for (int i = 0; i < itemHeights.size(); i++) {
-            //遍历获取最小差值
-            if (itemHeights.get(i).differ <= minItem.differ){
-                minItem = itemHeights.get(i);
-            }
-        }
-        return minItem;
-    }
-
-//    public static void main(String[] a){
-//
-//        CenterViewItem i = getMinDifferItem(Arrays.asList(
-//                new CenterViewItem(2 , 39)
-//                ,new CenterViewItem(3 , 3)
-//                ,new CenterViewItem(1 , 9)
-//                ,new CenterViewItem(4 , 449)));
-//       System.out.println("position:"+i.position+"   height:"+i.differ);
-//    }
-
-    static class CenterViewItem{
-        public CenterViewItem(int position, int differ) {
-            this.position = position; //当前Item索引
-            this.differ = differ; //当前item和居中位置的差值
-        }
-
-        public int position;
-        public int differ;
-    }
 }
diff --git a/app/src/main/java/com/ccb/arcselect/utils/CenterItemUtils.java b/app/src/main/java/com/ccb/arcselect/utils/CenterItemUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..8a49565f578a5a595e06968d0122830643e7b91e
--- /dev/null
+++ b/app/src/main/java/com/ccb/arcselect/utils/CenterItemUtils.java
@@ -0,0 +1,42 @@
+package com.ccb.arcselect.utils;
+
+import java.util.List;
+
+public class CenterItemUtils {
+
+    /**
+     * 计算距离中间最近的一个ItemView
+     * @param itemHeights
+     * @return
+     */
+    public static CenterViewItem getMinDifferItem(List<CenterViewItem> itemHeights){
+        CenterViewItem minItem = itemHeights.get(0); //默认第一个是最小差值
+        for (int i = 0; i < itemHeights.size(); i++) {
+            //遍历获取最小差值
+            if (itemHeights.get(i).differ <= minItem.differ){
+                minItem = itemHeights.get(i);
+            }
+        }
+        return minItem;
+    }
+
+//    public static void main(String[] a){
+//
+//        CenterViewItem i = getMinDifferItem(Arrays.asList(
+//                new CenterViewItem(2 , 39)
+//                ,new CenterViewItem(3 , 3)
+//                ,new CenterViewItem(1 , 9)
+//                ,new CenterViewItem(4 , 449)));
+//       System.out.println("position:"+i.position+"   height:"+i.differ);
+//    }
+
+   public static class CenterViewItem{
+        public CenterViewItem(int position, int differ) {
+            this.position = position; //当前Item索引
+            this.differ = differ; //当前item和居中位置的差值
+        }
+
+        public int position;
+        public int differ;
+    }
+}