修复数组越界bug

Author: CNCoderX

README.md

@@ -17,7 +17,7 @@ RecyclerViewHelper是基于android 原生库RecyclerView的功能扩展，扩展
 
 ## 添加依赖
 ```gradle
-compile 'com.cncoderx.recyclerviewhelper:library:1.2.2'
+compile 'com.github.CNCoderX:RecyclerViewHelper:1.2.3'
 
 // 如果需要添加抽屉功能，添加依赖：
 compile "com.daimajia.swipelayout:library:1.2.0@aar"

library/src/main/java/com/cncoderx/recyclerviewhelper/adapter/DelegateAdapter.java

@@ -148,12 +148,13 @@ private boolean isFullSpan(int position) {
 
         final int adjPosition = position - numHeaderView;
         final int itemCount = mAdapter.getItemCount();
+        final int lastPosition = adjPosition - itemCount;
         if (mLoadViewHolder != null && mLoadViewHolder.getState() != ILoadingView.STATE_GONE
-                && adjPosition == itemCount + numFooterView) {
+                && lastPosition == numFooterView) {
             return mLoadViewHolder.isFullSpan;
         }
-        if (adjPosition >= itemCount) {
-            return mFooterViewHolders.get(adjPosition - itemCount).isFullSpan;
+        if (lastPosition >= 0 && lastPosition < numFooterView) {
+            return mFooterViewHolders.get(lastPosition).isFullSpan;
         }
         return false;
     }