改bug；代码优化

Author: teach

consecutivescroller/src/main/java/com/donkingliang/consecutivescroller/ConsecutiveScrollerLayout.java

@@ -672,10 +672,10 @@ public boolean dispatchTouchEvent(MotionEvent ev) {
                     int touchY = ScrollUtils.getRawY(this, ev, actionIndex);
                     View targetView = getTouchTarget(touchX, touchY);
                     boolean canScrollVerticallyChild = ScrollUtils.canScrollVertically(targetView);
-                    boolean canScrollHorizontallyChild = ScrollUtils.canScrollHorizontally(targetView);
+                    boolean canScrollHorizontallyChild = ScrollUtils.isHorizontalScroll(this, touchX, touchY);
                     if (SCROLL_ORIENTATION != SCROLL_VERTICAL && canScrollVerticallyChild
                             && Math.abs(yVelocity) >= mMinimumVelocity
-                            && !ScrollUtils.isHorizontalScroll(this, touchX, touchY)) {
+                            && !canScrollHorizontallyChild) {
                         //如果当前是横向滑动，但是触摸的控件可以垂直滑动，并且产生垂直滑动的fling事件，
                         // 为了不让这个控件垂直fling，把事件设置为MotionEvent.ACTION_CANCEL。
                         ev.setAction(MotionEvent.ACTION_CANCEL);

consecutivescroller/src/main/java/com/donkingliang/consecutivescroller/ScrollUtils.java

@@ -22,6 +22,10 @@
  */
 public class ScrollUtils {
 
+    static Method computeVerticalScrollOffsetMethod;
+    static Method computeVerticalScrollRangeMethod;
+    static Method computeVerticalScrollExtentMethod;
+
     static int computeVerticalScrollOffset(View view) {
         View scrolledView = getScrolledView(view);
 
@@ -30,9 +34,11 @@ static int computeVerticalScrollOffset(View view) {
         }
 
         try {
-            Method method = View.class.getDeclaredMethod("computeVerticalScrollOffset");
-            method.setAccessible(true);
-            Object o = method.invoke(scrolledView);
+            if (computeVerticalScrollOffsetMethod == null){
+                computeVerticalScrollOffsetMethod = View.class.getDeclaredMethod("computeVerticalScrollOffset");
+                computeVerticalScrollOffsetMethod.setAccessible(true);
+            }
+            Object o = computeVerticalScrollOffsetMethod.invoke(scrolledView);
             if (o != null){
                 return (int) o;
             }
@@ -50,9 +56,11 @@ static int computeVerticalScrollRange(View view) {
         }
 
         try {
-            Method method = View.class.getDeclaredMethod("computeVerticalScrollRange");
-            method.setAccessible(true);
-            Object o = method.invoke(scrolledView);
+            if (computeVerticalScrollRangeMethod == null) {
+                computeVerticalScrollRangeMethod = View.class.getDeclaredMethod("computeVerticalScrollRange");
+                computeVerticalScrollRangeMethod.setAccessible(true);
+            }
+            Object o = computeVerticalScrollRangeMethod.invoke(scrolledView);
             if (o != null){
                 return (int) o;
             }
@@ -70,9 +78,12 @@ static int computeVerticalScrollExtent(View view) {
         }
 
         try {
-            Method method = View.class.getDeclaredMethod("computeVerticalScrollExtent");
-            method.setAccessible(true);
-            Object o = method.invoke(scrolledView);
+            if (computeVerticalScrollExtentMethod == null){
+                computeVerticalScrollExtentMethod = View.class.getDeclaredMethod("computeVerticalScrollExtent");
+                computeVerticalScrollExtentMethod.setAccessible(true);
+            }
+
+            Object o = computeVerticalScrollExtentMethod.invoke(scrolledView);
             if (o != null){
                 return (int) o;
             }