Contact.java

    /*
     * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
     *
     * 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 net.micode.notes.data;

    import android.content.Context;
    import android.database.Cursor;
    import android.provider.ContactsContract.CommonDataKinds.Phone;
    import android.provider.ContactsContract.Data;
    import android.telephony.PhoneNumberUtils;
    import android.util.Log;

    import java.util.HashMap;

    public class Contact {
        private static HashMap<String, String> sContactCache;
        private static final String TAG = "Contact";

        private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
        + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
        + " AND " + Data.RAW_CONTACT_ID + " IN "
                + "(SELECT raw_contact_id "
                + " FROM phone_lookup"
                + " WHERE min_match = '+')";

        public static String getContact(Context context, String phoneNumber) {
            if(sContactCache == null) {
                sContactCache = new HashMap<String, String>();
            }

            if(sContactCache.containsKey(phoneNumber)) {
                return sContactCache.get(phoneNumber);
            }

            String selection = CALLER_ID_SELECTION.replace("+",
                    PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
            Cursor cursor = context.getContentResolver().query(
                    Data.CONTENT_URI,
                    new String [] { Phone.DISPLAY_NAME },
                    selection,
                    new String[] { phoneNumber },
                    null);

            if (cursor != null && cursor.moveToFirst()) {
                try {
                    String name = cursor.getString(0);
                    sContactCache.put(phoneNumber, name);
                    return name;
                } catch (IndexOutOfBoundsException e) {
                    Log.e(TAG, " Cursor get string error " + e.toString());
                    return null;
                } finally {
                    cursor.close();
                }
            } else {
                Log.d(TAG, "No contact matched with number:" + phoneNumber);
                return null;
            }
        }
    }