add missing APIs related to scrolling

src/api-impl/android/view/View.java

@@ -1291,6 +1291,7 @@ public class View extends Object {
 	}
 
 	public void addOnLayoutChangeListener(OnLayoutChangeListener listener) {}
+	public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) {}
 
 	public boolean isSelected() {return false;}
 
@@ -1560,4 +1561,12 @@ public class View extends Object {
 	protected int computeHorizontalScrollExtent() {
 		return getWidth();
 	}
+
+	protected int computeVerticalScrollRange() {
+		return getHeight();
+	}
+
+	protected int computeVerticalScrollExtent() {
+		return getHeight();
+	}
 }

src/api-impl/android/view/ViewGroup.java

@@ -315,6 +315,16 @@ public class ViewGroup extends View implements ViewParent, ViewManager {
 		return false;
 	}
 
+	@Override
+	public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
+		return false;
+	}
+
+	@Override
+	public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
+		return false;
+	}
+
 	public static class LayoutParams {
 		public static final int FILL_PARENT = -1;
 		public static final int MATCH_PARENT = -1;

src/api-impl/android/view/ViewParent.java

@@ -8,4 +8,8 @@ public interface ViewParent {
 	public void requestDisallowInterceptTouchEvent(boolean disallowIntercept);
 
 	public abstract boolean onStartNestedScroll(View child, View target, int nestedScrollAxes);
+
+	public boolean onNestedPreFling(View target, float velocityX, float velocityY);
+
+	public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed);
 }

src/api-impl/android/view/animation/DecelerateInterpolator.java

@@ -2,12 +2,21 @@ package android.view.animation;
 
 public class DecelerateInterpolator implements Interpolator{
 
-	public DecelerateInterpolator(float value) {}
+	private float factor = 1.0f;
+
+	public DecelerateInterpolator(float value) {
+		factor = value;
+	}
 
 	@Override
 	public float getInterpolation(float input) {
-		// TODO Auto-generated method stub
-		throw new UnsupportedOperationException("Unimplemented method 'getInterpolation'");
+		float result;
+		if (factor == 1.0f) {
+			result = 1.0f - (1.0f - input) * (1.0f - input);
+		} else {
+			result = 1.0f - (float)Math.pow((1.0f - input), 2 * factor);
+		}
+		return result;
 	}
 
 }