diff --git a/libraries/app-helpers/interfaces/handheld/src/android/platform/helpers/IGoogleHelper.java b/libraries/app-helpers/interfaces/handheld/src/android/platform/helpers/IGoogleHelper.java
index 8b2973e..f6172d3 100644
--- a/libraries/app-helpers/interfaces/handheld/src/android/platform/helpers/IGoogleHelper.java
+++ b/libraries/app-helpers/interfaces/handheld/src/android/platform/helpers/IGoogleHelper.java
@@ -17,13 +17,14 @@
 package android.platform.helpers;
 
 import android.support.test.uiautomator.Direction;
+import android.support.test.uiautomator.UiObject2;
 
 public interface IGoogleHelper extends IAppHelper {
 
     /**
      * Setup expectations: Google app open
      *
-     * This method will start a voice search
+     * <p>This method will start a voice search
      *
      * @return true if the search is started, false otherwise
      */
@@ -32,76 +33,99 @@
     /**
      * Setup expectations: Google app open to a search result
      *
-     * This method will return the query from the search
+     * <p>This method will return the query from the search
      */
     public String getSearchQuery();
 
     /**
      * Setup expectations: In home and with search bar.
      *
-     * This method starts search from the search bar in home.
-     *
+     * <p>This method starts search from the search bar in home.
      */
-    default public void startSearch() {
+    public default void startSearch() {
         throw new UnsupportedOperationException("Not yet implemented.");
     }
 
     /**
      * Setup expectations: Google app open.
      *
-     * This method inputs keyword in search box.
+     * <p>This method inputs keyword in search box.
      *
      * @param query The keyword to search.
-     *
      */
-    default public void inputSearch(String query) {
+    public default void inputSearch(String query) {
         throw new UnsupportedOperationException("Not yet implemented.");
     }
 
     /**
      * Setup expectations: Google app open and a search keyword input.
      *
-     * This method clicks the search button and waits for the results.
-     *
+     * <p>This method clicks the search button and waits for the results.
      */
-    default public void clickSearchButtonAndWaitForResults() {
+    public default void clickSearchButtonAndWaitForResults() {
         throw new UnsupportedOperationException("Not yet implemented.");
     }
 
     /**
      * Setup expectations: Google app open to a search result.
      *
-     * This method flings the search results.
+     * <p>This method flings the search results.
      *
      * @param dir The direction of the fling, must be UP or DOWN.
-     *
      */
-    default public void flingSearchResults(Direction dir) {
+    public default void flingSearchResults(Direction dir) {
         throw new UnsupportedOperationException("Not yet implemented.");
     }
 
     /**
      * Setup expectations: In home.
      *
-     * This method flings right to Google Feed.
-     *
+     * <p>This method flings right to Google Feed.
      */
-    default public void openFeed() {
+    public default void openFeed() {
         throw new UnsupportedOperationException("Not yet implemented.");
     }
 
     /**
      * Setup expectations: Feed open.
      *
-     * This method flings the feed.
+     * <p>This method flings the feed.
      *
      * @param dir The direction of the fling, must be UP or DOWN.
      */
-    default public void flingFeed(Direction dir) {
+    public default void flingFeed(Direction dir) {
         throw new UnsupportedOperationException("Not yet implemented.");
     }
 
     /**
+     * Setup expectations: Feed open.
+     *
+     * <p>Get the UiObject2 of feed container.
+     */
+    public UiObject2 getFeedContainer();
+
+    /**
+     * Setup expectations: Feed open.
+     *
+     * <p>This method flings the feed.
+     *
+     * @param container The container with scrollable elements.
+     * @param dir The direction of the fling, must be UP or DOWN.
+     */
+    public void flingFeed(UiObject2 container, Direction dir);
+
+    /**
+     * Setup expectations: Feed open.
+     *
+     * <p>This method scrolls the feed with speed.
+     *
+     * @param container The container with scrollable elements.
+     * @param dir The direction of the scroll, must be UP or DOWN.
+     * @param speed The speed of scroll.
+     */
+    public void scrollFeed(UiObject2 container, Direction dir, int speed);
+
+    /**
      * Setup expectations: In home.
      *
      * <p>This method clear search result.