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diff --git a/setupwizardlib/src/main/java/com/android/setupwizardlib/items/ItemAdapter.java b/setupwizardlib/src/main/java/com/android/setupwizardlib/items/ItemAdapter.java
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.setupwizardlib.items;
+
+import android.util.SparseIntArray;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+
+/**
+ * An adapter typically used with ListView to display an
+ * {@link com.android.setupwizardlib.items.ItemHierarchy}. The item hierarchy used to create this
+ * adapter can be inflated by {@link ItemInflater} from XML.
+ */
+public class ItemAdapter extends BaseAdapter implements ItemHierarchy.Observer {
+
+    private final ItemHierarchy mItemHierarchy;
+    private ViewTypes mViewTypes = new ViewTypes();
+
+    public ItemAdapter(ItemHierarchy hierarchy) {
+        mItemHierarchy = hierarchy;
+        mItemHierarchy.registerObserver(this);
+        refreshViewTypes();
+    }
+
+    @Override
+    public int getCount() {
+        return mItemHierarchy.getCount();
+    }
+
+    @Override
+    public IItem getItem(int position) {
+        return mItemHierarchy.getItemAt(position);
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return position;
+    }
+
+    @Override
+    public int getItemViewType(int position) {
+        IItem item = getItem(position);
+        int layoutRes = item.getLayoutResource();
+        return mViewTypes.get(layoutRes);
+    }
+
+    @Override
+    public int getViewTypeCount() {
+        return mViewTypes.size();
+    }
+
+    private void refreshViewTypes() {
+        for (int i = 0; i < getCount(); i++) {
+            IItem item = getItem(i);
+            mViewTypes.add(item.getLayoutResource());
+        }
+    }
+
+    @Override
+    public View getView(int position, View convertView, ViewGroup parent) {
+        IItem item = getItem(position);
+        if (convertView == null) {
+            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
+            convertView = inflater.inflate(item.getLayoutResource(), parent, false);
+        }
+        item.onBindView(convertView);
+        return convertView;
+    }
+
+    @Override
+    public void onChanged(ItemHierarchy hierarchy) {
+        refreshViewTypes();
+        notifyDataSetChanged();
+    }
+
+    @Override
+    public boolean isEnabled(int position) {
+        return getItem(position).isEnabled();
+    }
+
+    public ItemHierarchy findItemById(int id) {
+        return mItemHierarchy.findItemById(id);
+    }
+
+    public ItemHierarchy getRootItemHierarchy() {
+        return mItemHierarchy;
+    }
+
+    /**
+     * A helper class to pack a sparse set of integers (e.g. resource IDs) to a contiguous list of
+     * integers (e.g. adapter positions), providing mapping to retrieve the original ID from a given
+     * position. This is used to pack the view types of the adapter into contiguous integers from
+     * a given layout resource.
+     */
+    private static class ViewTypes {
+        private SparseIntArray mPositionMap = new SparseIntArray();
+        private int nextPosition = 0;
+
+        public int add(int id) {
+            if (mPositionMap.indexOfKey(id) < 0) {
+                mPositionMap.put(id, nextPosition);
+                nextPosition++;
+            }
+            return mPositionMap.get(id);
+        }
+
+        public int size() {
+            return mPositionMap.size();
+        }
+
+        public int get(int id) {
+            return mPositionMap.get(id);
+        }
+    }
+}