diff --git a/sample/src/main/java/com/cundong/recyclerview/sample/ItemModel.java b/sample/src/main/java/com/cundong/recyclerview/sample/ItemModel.java
index 138d406..d2e1274 100644
--- a/sample/src/main/java/com/cundong/recyclerview/sample/ItemModel.java
+++ b/sample/src/main/java/com/cundong/recyclerview/sample/ItemModel.java
@@ -4,6 +4,25 @@
  * Created by liucundong on 2015/11/17.
  */
 public class ItemModel {
-    public long id;
-    public String title;
+
+    private long id;
+    private String title;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+
 }
\ No newline at end of file
diff --git a/sample/src/main/java/com/cundong/recyclerview/sample/MainActivity.java b/sample/src/main/java/com/cundong/recyclerview/sample/MainActivity.java
index 5497fc1..fae6c0b 100644
--- a/sample/src/main/java/com/cundong/recyclerview/sample/MainActivity.java
+++ b/sample/src/main/java/com/cundong/recyclerview/sample/MainActivity.java
@@ -53,8 +53,25 @@ protected void onCreate(Bundle savedInstanceState) {
     }
 
     private static class ListItem {
-        public String title;
-        public Class<?> activity;
+        private String title;
+        private Class<?> activity;
+        public String getTitle() {
+            return title;
+        }
+
+        public void setTitle(String title) {
+            this.title = title;
+        }
+
+        public Class<?> getActivity() {
+            return activity;
+        }
+
+        public void setActivity(Class<?> activity) {
+            this.activity = activity;
+        }
+
+
     }
 
     private class DataAdapter extends RecyclerView.Adapter {