UI widget for contacts email autocompletion

AndroidManifest.xml

<uses-permission android:name="android.permission.READ_CONTACTS" />

ContactsAutoComplete.java

public class ContactsAutoComplete extends AutoCompleteTextView {

    public ContactsAutoComplete(final Context context, final AttributeSet attrs,
            final int defStyle) {
        super(context, attrs, defStyle);
        this.setThreshold(0);
        this.setUpContacts();
    }

    public ContactsAutoComplete(final Context context, final AttributeSet attrs) {
        super(context, attrs);
        this.setThreshold(0);
        this.setUpContacts();
    }

    public ContactsAutoComplete(final Context context) {
        super(context);
        this.setThreshold(0);
        this.setUpContacts();
    }

    // --- comma separating stuff

    private String previous = ""; //$NON-NLS-1$
    private String seperator = ", "; //$NON-NLS-1$

    /**
     * This method filters out the existing text till the separator and launched
     * the filtering process again
     */
    @Override
    protected void performFiltering(final CharSequence text, final int keyCode) {
        String filterText = text.toString().trim();
        previous = filterText.substring(0,
                filterText.lastIndexOf(getSeperator()) + 1);
        filterText = filterText.substring(filterText.lastIndexOf(getSeperator()) + 1);
        if (!TextUtils.isEmpty(filterText)) {
            super.performFiltering(filterText, keyCode);
        }
    }

    /**
     * After a selection, capture the new value and append to the existing text
     */
    @Override
    protected void replaceText(final CharSequence text) {
        super.replaceText(previous + text + getSeperator());
    }

    public String getSeperator() {
        return seperator;
    }

    public void setSeperator(final String seperator) {
        this.seperator = seperator;
    }

    // --- contacts stuff

    private void setUpContacts() {
        ContactListAdapter adapter = new ContactListAdapter(getContext(), null);
        setAdapter(adapter);
    }

    @SuppressWarnings("nls")
    public static class ContactListAdapter extends CursorAdapter implements Filterable {
        public ContactListAdapter(Context context, Cursor c) {
            super(context, c);
            mContent = context.getContentResolver();
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            final LayoutInflater inflater = LayoutInflater.from(context);
            final TextView view = (TextView) inflater.inflate(
                    android.R.layout.simple_dropdown_item_1line, parent, false);
            view.setText(convertToString(getCursor()));
            return view;
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            ((TextView) view).setText(convertToString(cursor));
        }

        @Override
        public String convertToString(Cursor cursor) {
            return cursor.getString(1) + " <" + cursor.getString(2) +">";
        }

        @Override
        public Cursor runQueryOnBackgroundThread(CharSequence constraint) {
            if (getFilterQueryProvider() != null) {
                return getFilterQueryProvider().runQuery(constraint);
            }

            StringBuilder buffer = null;
            String[] args = null;
            if (constraint != null) {
                constraint = constraint.toString().trim();
                buffer = new StringBuilder();
                buffer.append("UPPER(").append(People.NAME).append(") GLOB ?");
                buffer.append(" OR ");
                buffer.append("UPPER(").append(ContactMethods.DATA).append(") GLOB ?");
                args = new String[] { constraint.toString().toUpperCase() + "*",
                        constraint.toString().toUpperCase() + "*" };
            }

            return mContent.query(Contacts.ContactMethods.CONTENT_EMAIL_URI,
                    PEOPLE_PROJECTION, buffer == null ? null : buffer.toString(), args,
                    Contacts.People.DEFAULT_SORT_ORDER);
        }

        private final ContentResolver mContent;
    }

    private static final String[] PEOPLE_PROJECTION = new String[] {
        People._ID,
        People.NAME,
        ContactMethods.DATA
    };
}

layout.xml

<com.yourcompany.ContactsAutoComplete
    android:id="@+id/emails"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    android:hint="Send To"
    android:singleLine="false" />