Don't let ScrollView intercept touch events if it can't scroll.

Bug 6872104

Change-Id: Iee643e052acc37485a8ec45b7af8be0783fb1a95

Author: adamp

core/java/android/widget/ScrollView.java

@@ -460,6 +460,13 @@ public boolean onInterceptTouchEvent(MotionEvent ev) {
             return true;
         }
 
+        /*
+         * Don't try to intercept touch if we can't scroll anyway.
+         */
+        if (getScrollY() == 0 && !canScrollVertically(1)) {
+            return false;
+        }
+
         switch (action & MotionEvent.ACTION_MASK) {
             case MotionEvent.ACTION_MOVE: {
                 /*