support click child view in sticky header

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.5.0'
+        classpath 'com.android.tools.build:gradle:2.2.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Dec 12 10:27:39 CST 2014
+#Thu Dec 29 14:37:07 CST 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.9-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip

library/src/main/java/com/timehop/stickyheadersrecyclerview/StickyRecyclerHeadersDecoration.java

@@ -165,4 +165,9 @@ public void invalidateHeaders() {
     mHeaderProvider.invalidate();
     mHeaderRects.clear();
   }
+
+  public Rect getHeaderRect(int position) {
+    return mHeaderRects.get(position);
+  }
+
 }

library/src/main/java/com/timehop/stickyheadersrecyclerview/StickyRecyclerHeadersTouchListener.java

@@ -1,10 +1,13 @@
 package com.timehop.stickyheadersrecyclerview;
 
+import android.graphics.Rect;
+import android.os.Build;
 import android.support.v7.widget.RecyclerView;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.SoundEffectConstants;
 import android.view.View;
+import android.view.ViewGroup;
 
 public class StickyRecyclerHeadersTouchListener implements RecyclerView.OnItemTouchListener {
   private final GestureDetector mTapDetector;
@@ -68,6 +71,12 @@ public boolean onSingleTapUp(MotionEvent e) {
       if (position != -1) {
         View headerView = mDecor.getHeaderView(mRecyclerView, position);
         long headerId = getAdapter().getHeaderId(position);
+        Rect rect = mDecor.getHeaderRect(position);
+        int hOffset = rect.left - headerView.getLeft();
+        int vOffset = rect.top - headerView.getTop();
+        if (isChildClicked(headerView, hOffset, vOffset, e)) {
+          return false;
+        }
         mOnHeaderClickListener.onHeaderClick(headerView, position, headerId);
         mRecyclerView.playSoundEffect(SoundEffectConstants.CLICK);
         headerView.onTouchEvent(e);
@@ -76,6 +85,31 @@ public boolean onSingleTapUp(MotionEvent e) {
       return false;
     }
 
+    private boolean isChildClicked(View headerView, int hOffset, int vOffset, MotionEvent e) {
+      if (headerView instanceof ViewGroup == false) {
+        return false;
+      }
+      ViewGroup vg = (ViewGroup) headerView;
+      int childCount = vg.getChildCount();
+      for (int i = 0; i < childCount; i++) {
+        View child = vg.getChildAt(i);
+        if (isViewTouched(child, hOffset, vOffset, e) && child.isClickable()) {
+          child.performClick();
+          return true;
+        }
+      }
+      return false;
+    }
+
+    private boolean isViewTouched(View view, int hOffset, int vOffset, MotionEvent e) {
+      Rect rect = new Rect();
+      rect.left = view.getLeft() + hOffset;
+      rect.right = view.getRight() + hOffset;
+      rect.top = view.getTop() + vOffset;
+      rect.bottom = view.getBottom() + vOffset;
+      return rect.contains((int) e.getX(), (int) e.getY());
+    }
+
     @Override
     public boolean onDoubleTap(MotionEvent e) {
       return true;

sample/src/main/java/com/timehop/stickyheadersrecyclerview/sample/MainActivity.java

@@ -143,15 +143,22 @@ public long getHeaderId(int position) {
 
     @Override
     public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
-      View view = LayoutInflater.from(parent.getContext())
+      final View view = LayoutInflater.from(parent.getContext())
           .inflate(R.layout.view_header, parent, false);
+      view.findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
+        @Override
+        public void onClick(View v) {
+          Toast.makeText(v.getContext(), "button"+v.getTag(), Toast.LENGTH_SHORT).show();
+        }
+      });
       return new RecyclerView.ViewHolder(view) {
       };
     }
 
     @Override
     public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) {
-      TextView textView = (TextView) holder.itemView;
+      holder.itemView.findViewById(R.id.btn).setTag(position);
+      TextView textView = (TextView) holder.itemView.findViewById(R.id.tv);
       textView.setText(String.valueOf(getItem(position).charAt(0)));
       holder.itemView.setBackgroundColor(getRandomColor());
     }

sample/src/main/res/layout/view_header.xml

@@ -1,15 +1,29 @@
 <?xml version="1.0" encoding="utf-8"?>
-
-<TextView
+<RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    android:orientation="horizontal"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:padding="16dp"
-    android:background="#001F3F"
-    android:textSize="28sp"
-    android:textStyle="bold"
-    android:textColor="@android:color/white"
-    tools:text="Animals starting with A"
-    tools:context=".MainActivity"/>
+    android:background="#001F3F">
+
+    <TextView
+        android:id="@+id/tv"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:padding="16dp"
+        android:textColor="@android:color/white"
+        android:textSize="28sp"
+        android:textStyle="bold"
+        tools:context=".MainActivity"
+        tools:text="Animals starting with A"/>
+
+    <Button
+        android:id="@+id/btn"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentRight="true"
+        android:layout_centerVertical="true"
+        android:text="button"/>
+
+</RelativeLayout>