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diff --git a/core/java/android/widget/ArrayAdapter.java b/core/java/android/widget/ArrayAdapter.java
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+/*
+ * Copyright (C) 2006 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 android.widget;
+
+import android.content.Context;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * A ListAdapter that manages a ListView backed by an array of arbitrary
+ * objects.  By default this class expects that the provided resource id referecnes
+ * a single TextView.  If you want to use a more complex layout, use the constructors that
+ * also takes a field id.  That field id should reference a TextView in the larger layout
+ * resource.
+ *
+ * However the TextView is referenced, it will be filled with the toString() of each object in
+ * the array. You can add lists or arrays of custom objects. Override the toString() method
+ * of your objects to determine what text will be displayed for the item in the list.
+ *
+ * To use something other than TextViews for the array display, for instance, ImageViews,
+ * or to have some of data besides toString() results fill the views,
+ * override {@link #getView(int, View, ViewGroup)} to return the type of view you want.
+ */
+public class ArrayAdapter<T> extends BaseAdapter implements Filterable {
+    /**
+     * Contains the list of objects that represent the data of this ArrayAdapter.
+     * The content of this list is referred to as "the array" in the documentation.
+     */
+    private List<T> mObjects;
+
+    /**
+     * Lock used to modify the content of {@link #mObjects}. Any write operation
+     * performed on the array should be synchronized on this lock. This lock is also
+     * used by the filter (see {@link #getFilter()} to make a synchronized copy of
+     * the original array of data.
+     */
+    private final Object mLock = new Object();
+
+    /**
+     * The resource indicating what views to inflate to display the content of this
+     * array adapter.
+     */
+    private int mResource;
+
+    /**
+     * The resource indicating what views to inflate to display the content of this
+     * array adapter in a drop down widget.
+     */
+    private int mDropDownResource;
+
+    /**
+     * If the inflated resource is not a TextView, {@link #mFieldId} is used to find
+     * a TextView inside the inflated views hierarchy. This field must contain the
+     * identifier that matches the one defined in the resource file.
+     */
+    private int mFieldId = 0;
+
+    /**
+     * Indicates whether or not {@link #notifyDataSetChanged()} must be called whenever
+     * {@link #mObjects} is modified.
+     */
+    private boolean mNotifyOnChange = true;
+
+    private Context mContext;    
+
+    private ArrayList<T> mOriginalValues;
+    private ArrayFilter mFilter;
+
+    private LayoutInflater mInflater;
+
+    /**
+     * Constructor
+     *
+     * @param context The current context.
+     * @param textViewResourceId The resource ID for a layout file containing a TextView to use when
+     *                 instantiating views.
+     */
+    public ArrayAdapter(Context context, int textViewResourceId) {
+        init(context, textViewResourceId, 0, new ArrayList<T>());
+    }
+
+    /**
+     * Constructor
+     *
+     * @param context The current context.
+     * @param resource The resource ID for a layout file containing a layout to use when
+     *                 instantiating views.
+     * @param textViewResourceId The id of the TextView within the layout resource to be populated
+     */
+    public ArrayAdapter(Context context, int resource, int textViewResourceId) {
+        init(context, resource, textViewResourceId, new ArrayList<T>());
+    }
+
+    /**
+     * Constructor
+     *
+     * @param context The current context.
+     * @param textViewResourceId The resource ID for a layout file containing a TextView to use when
+     *                 instantiating views.
+     * @param objects The objects to represent in the ListView.
+     */
+    public ArrayAdapter(Context context, int textViewResourceId, T[] objects) {
+        init(context, textViewResourceId, 0, Arrays.asList(objects));
+    }
+
+    /**
+     * Constructor
+     *
+     * @param context The current context.
+     * @param resource The resource ID for a layout file containing a layout to use when
+     *                 instantiating views.
+     * @param textViewResourceId The id of the TextView within the layout resource to be populated
+     * @param objects The objects to represent in the ListView.
+     */
+    public ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects) {
+        init(context, resource, textViewResourceId, Arrays.asList(objects));
+    }
+
+    /**
+     * Constructor
+     *
+     * @param context The current context.
+     * @param textViewResourceId The resource ID for a layout file containing a TextView to use when
+     *                 instantiating views.
+     * @param objects The objects to represent in the ListView.
+     */
+    public ArrayAdapter(Context context, int textViewResourceId, List<T> objects) {
+        init(context, textViewResourceId, 0, objects);
+    }
+
+    /**
+     * Constructor
+     *
+     * @param context The current context.
+     * @param resource The resource ID for a layout file containing a layout to use when
+     *                 instantiating views.
+     * @param textViewResourceId The id of the TextView within the layout resource to be populated
+     * @param objects The objects to represent in the ListView.
+     */
+    public ArrayAdapter(Context context, int resource, int textViewResourceId, List<T> objects) {
+        init(context, resource, textViewResourceId, objects);
+    }
+
+    /**
+     * Adds the specified object at the end of the array.
+     *
+     * @param object The object to add at the end of the array.
+     */
+    public void add(T object) {
+        if (mOriginalValues != null) {
+            synchronized (mLock) {
+                mOriginalValues.add(object);
+                if (mNotifyOnChange) notifyDataSetChanged();
+            }
+        } else {
+            mObjects.add(object);
+            if (mNotifyOnChange) notifyDataSetChanged();
+        }
+    }
+
+    /**
+     * Inserts the spcified object at the specified index in the array.
+     *
+     * @param object The object to insert into the array.
+     * @param index The index at which the object must be inserted.
+     */
+    public void insert(T object, int index) {
+        if (mOriginalValues != null) {
+            synchronized (mLock) {
+                mOriginalValues.add(index, object);
+                if (mNotifyOnChange) notifyDataSetChanged();
+            }
+        } else {
+            mObjects.add(index, object);
+            if (mNotifyOnChange) notifyDataSetChanged();
+        }
+    }
+
+    /**
+     * Removes the specified object from the array.
+     *
+     * @param object The object to remove.
+     */
+    public void remove(T object) {
+        if (mOriginalValues != null) {
+            synchronized (mLock) {
+                mOriginalValues.remove(object);
+            }
+        } else {
+            mObjects.remove(object);
+        }
+        if (mNotifyOnChange) notifyDataSetChanged();
+    }
+
+    /**
+     * Remove all elements from the list.
+     */
+    public void clear() {
+        if (mOriginalValues != null) {
+            synchronized (mLock) {
+                mOriginalValues.clear();
+            }
+        } else {
+            mObjects.clear();
+        }
+        if (mNotifyOnChange) notifyDataSetChanged();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void notifyDataSetChanged() {
+        super.notifyDataSetChanged();
+        mNotifyOnChange = true;
+    }
+
+    /**
+     * Control whether methods that change the list ({@link #add},
+     * {@link #insert}, {@link #remove}, {@link #clear}) automatically call
+     * {@link #notifyDataSetChanged}.  If set to false, caller must
+     * manually call notifyDataSetChanged() to have the changes
+     * reflected in the attached view.
+     *
+     * The default is true, and calling notifyDataSetChanged()
+     * resets the flag to true.
+     *
+     * @param notifyOnChange if true, modifications to the list will
+     *                       automatically call {@link
+     *                       #notifyDataSetChanged}
+     */
+    public void setNotifyOnChange(boolean notifyOnChange) {
+        mNotifyOnChange = notifyOnChange;
+    }
+
+    private void init(Context context, int resource, int textViewResourceId, List<T> objects) {
+        mContext = context;
+        mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+        mResource = mDropDownResource = resource;
+        mObjects = objects;
+        mFieldId = textViewResourceId;
+    }
+
+    /**
+     * Returns the context associated with this array adapter. The context is used
+     * to create views from the resource passed to the constructor.
+     *
+     * @return The Context associated with this adapter.
+     */
+    public Context getContext() {
+        return mContext;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public int getCount() {
+        return mObjects.size();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public T getItem(int position) {
+        return mObjects.get(position);
+    }
+
+    /**
+     * Returns the position of the specified item in the array.
+     *
+     * @param item The item to retrieve the position of.
+     *
+     * @return The position of the specified item.
+     */
+    public int getPosition(T item) {
+        return mObjects.indexOf(item);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public long getItemId(int position) {
+        return position;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public View getView(int position, View convertView, ViewGroup parent) {
+        return createViewFromResource(position, convertView, parent, mResource);
+    }
+
+    private View createViewFromResource(int position, View convertView, ViewGroup parent,
+            int resource) {
+        View view;
+        TextView text;
+
+        if (convertView == null) {
+            view = mInflater.inflate(resource, parent, false);
+        } else {
+            view = convertView;
+        }
+
+        try {
+            if (mFieldId == 0) {
+                //  If no custom field is assigned, assume the whole resource is a TextView
+                text = (TextView) view;
+            } else {
+                //  Otherwise, find the TextView field within the layout
+                text = (TextView) view.findViewById(mFieldId);
+            }
+        } catch (ClassCastException e) {
+            Log.e("ArrayAdapter", "You must supply a resource ID for a TextView");
+            throw new IllegalStateException(
+                    "ArrayAdapter requires the resource ID to be a TextView", e);
+        }
+
+        text.setText(getItem(position).toString());
+
+        return view;
+    }
+
+    /**
+     * <p>Sets the layout resource to create the drop down views.</p>
+     *
+     * @param resource the layout resource defining the drop down views
+     * @see #getDropDownView(int, android.view.View, android.view.ViewGroup)
+     */
+    public void setDropDownViewResource(int resource) {
+        this.mDropDownResource = resource;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public View getDropDownView(int position, View convertView, ViewGroup parent) {
+        return createViewFromResource(position, convertView, parent, mDropDownResource);
+    }
+
+    /**
+     * Creates a new ArrayAdapter from external resources. The content of the array is
+     * obtained through {@link android.content.res.Resources#getTextArray(int)}.
+     *
+     * @param context The application's environment.
+     * @param textArrayResId The identifier of the array to use as the data source.
+     * @param textViewResId The identifier of the layout used to create views.
+     *
+     * @return An ArrayAdapter<CharSequence>.
+     */
+    public static ArrayAdapter<CharSequence> createFromResource(Context context,
+            int textArrayResId, int textViewResId) {
+        CharSequence[] strings = context.getResources().getTextArray(textArrayResId);
+        return new ArrayAdapter<CharSequence>(context, textViewResId, strings);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public Filter getFilter() {
+        if (mFilter == null) {
+            mFilter = new ArrayFilter();
+        }
+        return mFilter;
+    }
+
+    /**
+     * <p>An array filters constrains the content of the array adapter with
+     * a prefix. Each item that does not start with the supplied prefix
+     * is removed from the list.</p>
+     */
+    private class ArrayFilter extends Filter {
+        @Override
+        protected FilterResults performFiltering(CharSequence prefix) {
+            FilterResults results = new FilterResults();
+
+            if (mOriginalValues == null) {
+                synchronized (mLock) {
+                    mOriginalValues = new ArrayList<T>(mObjects);
+                }
+            }
+
+            if (prefix == null || prefix.length() == 0) {
+                synchronized (mLock) {
+                    ArrayList<T> list = new ArrayList<T>(mOriginalValues);
+                    results.values = list;
+                    results.count = list.size();
+                }
+            } else {
+                String prefixString = prefix.toString().toLowerCase();
+
+                final ArrayList<T> values = mOriginalValues;
+                final int count = values.size();
+
+                final ArrayList<T> newValues = new ArrayList<T>(count);
+
+                for (int i = 0; i < count; i++) {
+                    final T value = values.get(i);
+                    final String valueText = value.toString().toLowerCase();
+
+                    // First match against the whole, non-splitted value
+                    if (valueText.startsWith(prefixString)) {
+                        newValues.add(value);
+                    } else {
+                        final String[] words = valueText.split(" ");
+                        final int wordCount = words.length;
+
+                        for (int k = 0; k < wordCount; k++) {
+                            if (words[k].startsWith(prefixString)) {
+                                newValues.add(value);
+                                break;
+                            }
+                        }
+                    }
+                }
+
+                results.values = newValues;
+                results.count = newValues.size();
+            }
+
+            return results;
+        }
+
+        @Override
+        protected void publishResults(CharSequence constraint, FilterResults results) {
+            //noinspection unchecked
+            mObjects = (List<T>) results.values;
+            if (results.count > 0) {
+                notifyDataSetChanged();
+            } else {
+                notifyDataSetInvalidated();
+            }
+        }
+    }
+}