Make EdgeEffect public API.

This enables apps to make use of the system's visual edge effect used
during overscroll in 2D content.

Also un-@hide the getCurrVelocity methods from Scroller/OverScroller,
without which it becomes cumbersome to obtain values to pass to the
EdgeEffect#onAbsorb method.

Change-Id: I40e452455f5cb5d45d1fb3687f739fc8eae65560

1 files changed, 4 insertions, 7 deletions

diff --git a/core/java/android/widget/ScrollView.java b/core/java/android/widget/ScrollView.java
index 09c875bd337e..6a6bc236a84a 100644
--- a/core/java/android/widget/ScrollView.java
+++ b/core/java/android/widget/ScrollView.java
@@ -69,8 +69,8 @@ public class ScrollView extends FrameLayout {
 
     private final Rect mTempRect = new Rect();
     private OverScroller mScroller;
-    private EdgeGlow mEdgeGlowTop;
-    private EdgeGlow mEdgeGlowBottom;
+    private EdgeEffect mEdgeGlowTop;
+    private EdgeEffect mEdgeGlowBottom;
 
     /**
      * Position of the last motion event.
@@ -1511,11 +1511,8 @@ public class ScrollView extends FrameLayout {
         if (mode != OVER_SCROLL_NEVER) {
             if (mEdgeGlowTop == null) {
                 Context context = getContext();
-                final Resources res = context.getResources();
-                final Drawable edge = res.getDrawable(R.drawable.overscroll_edge);
-                final Drawable glow = res.getDrawable(R.drawable.overscroll_glow);
-                mEdgeGlowTop = new EdgeGlow(context, edge, glow);
-                mEdgeGlowBottom = new EdgeGlow(context, edge, glow);
+                mEdgeGlowTop = new EdgeEffect(context);
+                mEdgeGlowBottom = new EdgeEffect(context);
             }
         } else {
             mEdgeGlowTop = null;