处理RecyclerView判断滑动到顶部和底部不准确的问题。

donkingliang · Jul 30, 2020 · 0f961b0 · 0f961b0
1 parent d58994f
commit 0f961b0
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Showing 4 changed files with 53 additions and 9 deletions.
diff --git a/...croller/src/main/java/com/donkingliang/consecutivescroller/ConsecutiveScrollerLayout.java b/...croller/src/main/java/com/donkingliang/consecutivescroller/ConsecutiveScrollerLayout.java
@@ -1656,8 +1656,7 @@ public boolean isScrollTop() {
         List<View> children = getEffectiveChildren();
         if (children.size() > 0) {
             View child = children.get(0);
-            View scrolledView = ScrollUtils.getScrolledView(child);
-            return getScrollY() <= 0 && !scrolledView.canScrollVertically(-1);
+            return getScrollY() <= 0 && !ScrollUtils.canScrollVertically(child,-1);
         }
         return true;
     }
@@ -1671,12 +1670,20 @@ public boolean isScrollBottom() {
         List<View> children = getEffectiveChildren();
         if (children.size() > 0) {
             View child = children.get(children.size() - 1);
-            View scrolledView = ScrollUtils.getScrolledView(child);
-            return getScrollY() >= mScrollRange && !scrolledView.canScrollVertically(1);
+            return getScrollY() >= mScrollRange && !ScrollUtils.canScrollVertically(child,1);
         }
         return true;
     }
 
+    @Override
+    public boolean canScrollVertically(int direction) {
+        if (direction > 0){
+            return !isScrollBottom();
+        } else {
+            return !isScrollTop();
+        }
+    }
+
     /**
      * 禁止设置滑动监听，因为这个监听器已无效
      * 若想监听容器的滑动，请使用

diff --git a/...tivescroller/src/main/java/com/donkingliang/consecutivescroller/ConsecutiveViewPager.java b/...tivescroller/src/main/java/com/donkingliang/consecutivescroller/ConsecutiveViewPager.java
@@ -15,7 +15,7 @@
 import androidx.viewpager.widget.ViewPager;
 
 /**
- * @Author teach liang
+ * @Author donkingliang
  * @Description
  * @Date 2020/5/22
  */

diff --git a/...ecutivescroller/src/main/java/com/donkingliang/consecutivescroller/LayoutParamsUtils.java b/...ecutivescroller/src/main/java/com/donkingliang/consecutivescroller/LayoutParamsUtils.java
@@ -3,7 +3,7 @@
 import android.view.ViewGroup;
 
 /**
- * @Author teach liang
+ * @Author donkingliang
  * @Description
  * @Date 2020/5/22
  */

diff --git a/consecutivescroller/src/main/java/com/donkingliang/consecutivescroller/ScrollUtils.java b/consecutivescroller/src/main/java/com/donkingliang/consecutivescroller/ScrollUtils.java
@@ -79,7 +79,7 @@ static int computeVerticalScrollExtent(View view) {
      */
     static int getScrollTopOffset(View view) {
         if (isConsecutiveScrollerChild(view) && canScrollVertically(view, -1)) {
-            return -computeVerticalScrollOffset(view);
+            return Math.min(-computeVerticalScrollOffset(view), -1);
         } else {
             return 0;
         }
@@ -93,8 +93,8 @@ static int getScrollTopOffset(View view) {
      */
     static int getScrollBottomOffset(View view) {
         if (isConsecutiveScrollerChild(view) && canScrollVertically(view, 1)) {
-            return computeVerticalScrollRange(view) - computeVerticalScrollOffset(view)
-                    - computeVerticalScrollExtent(view);
+            return Math.max(computeVerticalScrollRange(view) - computeVerticalScrollOffset(view)
+                    - computeVerticalScrollExtent(view), 1);
         } else {
             return 0;
         }
@@ -128,6 +128,41 @@ static boolean canScrollVertically(View view, int direction) {
                 return false;
             }
         } else {
+            // RecyclerView通过canScrollVertically方法判断滑动到边界不准确，需要单独处理
+            if (scrolledView instanceof RecyclerView) {
+                RecyclerView recyclerView = (RecyclerView) scrolledView;
+                RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
+                RecyclerView.Adapter adapter = recyclerView.getAdapter();
+
+                if (layoutManager != null && adapter != null && adapter.getItemCount() > 0) {
+                    View itemView = layoutManager.findViewByPosition(direction > 0 ? adapter.getItemCount() - 1 : 0);
+                    if (itemView == null) {
+                        return true;
+                    }
+                } else {
+                    return false;
+                }
+
+                int count = recyclerView.getChildCount();
+                if (direction > 0) {
+                    for (int i = count - 1; i >= 0; i--) {
+                        View child = recyclerView.getChildAt(i);
+                        if (child.getY() + child.getHeight() > recyclerView.getHeight() - recyclerView.getPaddingBottom()) {
+                            return true;
+                        }
+                    }
+                    return false;
+                } else {
+                    for (int i = 0; i < count; i++) {
+                        View child = recyclerView.getChildAt(i);
+                        if (child.getY() < recyclerView.getPaddingTop()) {
+                            return true;
+                        }
+                    }
+                    return false;
+                }
+            }
+
             return scrolledView.canScrollVertically(direction);
         }
     }
@@ -291,6 +326,7 @@ static void stopInterceptRequestLayout(RecyclerView view) {
 
     /**
      * 判断父级容器是否是isConsecutive：true.判断到最近的ConsecutiveScrollerLayout容器
+     *
      * @param view
      * @return
      */
@@ -309,6 +345,7 @@ static boolean isConsecutiveScrollParent(View view) {
 
     /**
      * 判断当前触摸点下是否有view可以水平滑动
+     *
      * @param rootView
      * @param touchX
      * @param touchY