fix bugs

README.md

@@ -8,7 +8,7 @@ Usage
 -----
 
 1. Add jcenter() to repositories block in your gradle file.
-2. Add `implementation 'com.shuhart.stickyheader:stickyheader:1.0.1'` to your dependencies.
+2. Add `implementation 'com.shuhart.stickyheader:stickyheader:1.0.2` to your dependencies.
 3. Look into the sample for additional details on how to use and configure the library.
 
 You should provide an adapter that extends [StickyAdapter](https://github.com/shuhart/StickyHeader/blob/master/stickyheader/src/main/java/com/shuhart/stickyheader/StickyAdapter.java) to the StickyHeaderItemDecorator that is used to create and bind sticky headers.

sample/src/main/java/com/shuhart/stickyheader/SectionAdapter.java

@@ -10,7 +10,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-public class SectionAdapter extends StickyHeaderItemDecorator.StickyAdapter<RecyclerView.ViewHolder, RecyclerView.ViewHolder> {
+public class SectionAdapter extends StickyAdapter<RecyclerView.ViewHolder, RecyclerView.ViewHolder> {
     List<Section> items = new ArrayList<>();
 
     @Override
@@ -44,18 +44,18 @@ public int getItemCount() {
     }
 
     @Override
-    int getHeaderPositionForItem(int itemPosition) {
+    public int getHeaderPositionForItem(int itemPosition) {
         return items.get(itemPosition).section();
     }
 
     @SuppressLint("SetTextI18n")
     @Override
-    void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int headerPosition) {
+    public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int headerPosition) {
         ((HeaderViewholder) holder).textView.setText("Header " + headerPosition);
     }
 
     @Override
-    RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
+    public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
         return createViewHolder(parent, Section.HEADER);
     }
 

stickyheader/build.gradle

@@ -15,7 +15,7 @@ ext {
     siteUrl = 'https://github.com/shuhart/StickyHeader'
     gitUrl = 'https://github.com/shuhart/StickyHeader.git'
 
-    libraryVersion = '1.0.1'
+    libraryVersion = '1.0.2'
 
     developerId = 'shuhart'
     developerName = 'Redrick Shuhart'

stickyheader/src/main/java/com/shuhart/stickyheader/StickyAdapter.java

@@ -17,7 +17,8 @@ public abstract class StickyAdapter<SVH extends RecyclerView.ViewHolder,
      *
      * @param itemPosition int. Adapter's position of the item for which to do
      *                     the search of the position of the header item.
-     * @return int. Position of the header item in the adapter.
+     * @return int. Position of the header for an item in the adapter or
+     * {@link RecyclerView.NO_POSITION} (-1) if an item has no header.
      */
     public abstract int getHeaderPositionForItem(int itemPosition);
 

stickyheader/src/main/java/com/shuhart/stickyheader/StickyHeaderItemDecorator.java

@@ -93,7 +93,7 @@ public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
     @SuppressWarnings("unchecked")
     private void updateStickyHeader(int topChildPosition, int contactChildPosition) {
         int headerPositionForItem = adapter.getHeaderPositionForItem(topChildPosition);
-        if (headerPositionForItem != currentStickyPosition) {
+        if (headerPositionForItem != currentStickyPosition && headerPositionForItem != RecyclerView.NO_POSITION) {
             adapter.onBindHeaderViewHolder(currentStickyHolder, headerPositionForItem);
             currentStickyPosition = headerPositionForItem;
         } else if (contactChildPosition != RecyclerView.NO_POSITION) {