Merge pull request #72 from yaoandy107/dev

Refactor: convert files about sticky header to Kotlin

app/src/main/java/tw/y_studio/ptt/ui/RecyclerItemClickListener.java

@@ -74,7 +74,7 @@ public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
 
             View childView = rv.findChildViewUnder(e.getX(), e.getY());
             if (childView != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
-                if (e.getY() > 0 && e.getY() > decorator.getStickyHolderHight()) {
+                if (e.getY() > 0 && e.getY() > decorator.getStickyHolderHeight()) {
                     clickListener.onItemClick(childView, rv.getChildAdapterPosition(childView));
                 } else {
                     clickListener.onItemClick(childView, 0);

app/src/main/java/tw/y_studio/ptt/ui/stickyheader/StickyAdapter.kt

@@ -0,0 +1,43 @@
+package tw.y_studio.ptt.ui.stickyheader
+
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+
+abstract class StickyAdapter<SVH : RecyclerView.ViewHolder?, VH : RecyclerView.ViewHolder?> : RecyclerView.Adapter<VH>() {
+    /**
+     * This method gets called by [StickyHeaderItemDecorator] to fetch the position of the
+     * header item in the adapter that is used for (represents) item at specified position.
+     *
+     * @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 for an item in the adapter or RecyclerView.NO_POSITION
+     * (-1) if an item has no header.
+     */
+    abstract fun getHeaderPositionForItem(itemPosition: Int): Int
+
+    /**
+     * This method gets called by [StickyHeaderItemDecorator] to setup the header View.
+     *
+     * @param holder RecyclerView.ViewHolder. Holder to bind the data on.
+     * @param headerPosition int. Position of the header item in the adapter.
+     */
+    abstract fun onBindHeaderViewHolder(holder: SVH, headerPosition: Int)
+
+    /**
+     * Called only twice when [StickyHeaderItemDecorator] needs a new [ ] to represent a sticky header item. Those two instances will be
+     * cached and used to represent a current top sticky header and the moving one.
+     *
+     *
+     * You can either create a new View manually or inflate it from an XML layout file.
+     *
+     *
+     * The new ViewHolder will be used to display items of the adapter using [ ][.onBindHeaderViewHolder]. Since it will be re-used to display
+     * different items in the data set, it is a good idea to cache references to sub views of the
+     * View to avoid unnecessary View.findViewById(int) calls.
+     *
+     * @param parent The ViewGroup to resolve a layout params.
+     * @return A new ViewHolder that holds a View of the given view type.
+     * @see .onBindHeaderViewHolder
+     */
+    abstract fun onCreateHeaderViewHolder(parent: ViewGroup): SVH
+}