-> Fixing a bug where AdapterViewAnimator doesn't refresh correctly

-> Reduced swipe threshold for StackView
Change-Id: I0f04f45dade57f29581fe03fb195a6db5f12adb1

core/java/android/widget/AdapterViewAnimator.java

@@ -379,11 +379,13 @@ public abstract class AdapterViewAnimator extends AdapterView<Adapter>
     }
 
     void refreshChildren() {
+        if (mAdapter == null) return;
         for (int i = mCurrentWindowStart; i <= mCurrentWindowEnd; i++) {
-            int index = modulo(i, mMaxNumActiveViews);
+            int index = modulo(i, getWindowSize());
 
+            int adapterCount = mAdapter.getCount();
             // get the fresh child from the adapter
-            View updatedChild = mAdapter.getView(i, null, this);
+            View updatedChild = mAdapter.getView(modulo(i, adapterCount), null, this);
 
             if (mViewsMap.containsKey(index)) {
                 FrameLayout fl = (FrameLayout) mViewsMap.get(index).view;

core/java/android/widget/StackView.java

@@ -79,7 +79,12 @@ public class StackView extends AdapterViewAnimator {
      * Specifies how far you need to swipe (up or down) before it
      * will be consider a completed gesture when you lift your finger
      */
-    private static final float SWIPE_THRESHOLD_RATIO = 0.35f;
+    private static final float SWIPE_THRESHOLD_RATIO = 0.2f;
+
+    /**
+     * Specifies the total distance, relative to the size of the stack,
+     * that views will be slid, either up or down
+     */
     private static final float SLIDE_UP_RATIO = 0.7f;
 
     /**