Android providers 解析之telephony

Android providers的源代码结构如下:

android-2.2-froyo/ com/ android/ providers：

• [applications]
• [calendar]
• [contacts]
• [downloads]
• [drm]
• [media]
• [settings]
• [telephony]
• [userdictionary]

本篇来解析一下telephony这个provider中的代码，首先来看一下它的目录结构：

android-2.2-froyo/ com/ android/ providers/ telephony：

• MmsProvider.java
• MmsSmsDatabaseHelper.java
• MmsSmsProvider.java
• SmsProvider.java
• TelephonyProvider.java
• Telephony.java  (隐藏类，在Android 的source源代码中可以找到，如：sources\android-14\android\provider\Telephony.java )

以上6个类可以划分为3类：

第一类：数据库管理工具类 (A helper class to manage database)，包括：MmsSmsDatabaseHelper.java

第二类：与电话操作相关数据类，包括：Telephony，它是个特殊的类，隐藏类

第三类：内容提供者 (ContentProvider)，包括：MmsProvider.java、SmsProvider.java、MmsSmsProvider.java、TelephonyProvider.java，它们都继承于ContentProvider。

下面分别讲解一下以上三大类别的代码：

一、MmsSmsDatabaseHelper.java

        由于它的代码有2828行，不宜贴出，这里抽取几个重要变量和方法来解析一下，

        public class MmsSmsDatabaseHelper extends SQLiteOpenHelper 说明它是作为数据库管理工具类，

    static final String DATABASE_NAME = "mmssms.db";
    /// M: Code analyze 006, unknown, for database upgrade.
    static final int DATABASE_VERSION = 560000;

         这里定义了数据库的名称和初始化版本。
        

/// M: Add for ip message @{
    // this need be the first because it is used by later final consts.
    private static final String UPDATE_THREAD_READ_COUNT =
            "  UPDATE threads SET readcount = " +
            "  (SELECT count(_id)FROM " +
            "  (SELECT DISTINCT date * 1 AS normalized_date, _id, read FROM sms " +
            "    WHERE ((read=1) AND thread_id = new.thread_id AND (type != 3)) " +
            "  UNION SELECT DISTINCT date * 1000 AS normalized_date, pdu._id, read " +
            "  FROM pdu LEFT JOIN pending_msgs ON pdu._id = pending_msgs.msg_id " +
            "  WHERE ((read=1) AND thread_id = new.thread_id AND msg_box != 3 AND (msg_box != 3 " +
            "        AND (m_type = 128 OR m_type = 132 OR m_type = 130)))" +
            "   UNION SELECT DISTINCT date * 1 AS normalized_date, _id, read FROM cellbroadcast " +
            "   WHERE ((read=1) AND thread_id = new.thread_id) ORDER BY normalized_date ASC))  " +
            "  WHERE threads._id = new.thread_id; ";

         其中还定义了类似的数据库语句的final型变量，如：UPDATE_THREAD_READ_COUNT_OLD、SMS_UPDATE_THREAD_READ_BODY、UPDATE_THREAD_COUNT_ON_NEW、UPDATE_THREAD_COUNT_ON_OLD、SMS_UPDATE_THREAD_DATE_SNIPPET_COUNT_ON_UPDATE等。

二、Telephony.java

The Telephony provider contains data related to phone operation.

该类的outline:

该类中定义了几个非常重要的内部类，在MmsProvider，SmsProvider，MmsSmsProvider中会用到。

1、接口 TextBasedSmsColumns：Base columns for tables that contain text based SMSs.

2、接口 BaseMmsColumns ：Base columns for tables that contain MMSs.

      public interface BaseMmsColumns extends BaseColumns 它继承BaseColumns这个接口。

3、接口 CanonicalAddressesColumns ：Columns for the "canonical_addresses" table used by MMS and
      * SMS."

      public interface CanonicalAddressesColumns extends BaseColumns。

4、接口 ThreadsColumns ：Columns for the "threads" table used by MMS and SMS.

      public interface ThreadsColumns extends BaseColumns.

5、类 Sms：

      类结构截图

   Sms中定义了6个内部类，

  代码：

/**
     * Contains all text based SMS messages.
     */
    public static final class Sms implements BaseColumns, TextBasedSmsColumns {
        public static final Cursor query(ContentResolver cr, String[] projection) {
            return cr.query(CONTENT_URI, projection, null, null, DEFAULT_SORT_ORDER);
        }

        public static final Cursor query(ContentResolver cr, String[] projection,
                String where, String orderBy) {
            return cr.query(CONTENT_URI, projection, where,
                                         null, orderBy == null ? DEFAULT_SORT_ORDER : orderBy);
        }

        /**
         * The content:// style URL for this table
         */
        public static final Uri CONTENT_URI =
            Uri.parse("content://sms");

        /**
         * The default sort order for this table
         */
        public static final String DEFAULT_SORT_ORDER = "date DESC";

        /**
         * Add an SMS to the given URI.
         *
         * @param resolver the content resolver to use
         * @param uri the URI to add the message to
         * @param address the address of the sender
         * @param body the body of the message
         * @param subject the psuedo-subject of the message
         * @param date the timestamp for the message
         * @param read true if the message has been read, false if not
         * @param deliveryReport true if a delivery report was requested, false if not
         * @return the URI for the new message
         */
        public static Uri addMessageToUri(ContentResolver resolver,
                Uri uri, String address, String body, String subject,
                Long date, boolean read, boolean deliveryReport) {
            return addMessageToUri(resolver, uri, address, body, subject,
                    date, read, deliveryReport, -1L);
        }

        /**
         * Add an SMS to the given URI with thread_id specified.
         *
         * @param resolver the content resolver to use
         * @param uri the URI to add the message to
         * @param address the address of the sender
         * @param body the body of the message
         * @param subject the psuedo-subject of the message
         * @param date the timestamp for the message
         * @param read true if the message has been read, false if not
         * @param deliveryReport true if a delivery report was requested, false if not
         * @param threadId the thread_id of the message
         * @return the URI for the new message
         */
        public static Uri addMessageToUri(ContentResolver resolver,
                Uri uri, String address, String body, String subject,
                Long date, boolean read, boolean deliveryReport, long threadId) {
            ContentValues values = new ContentValues(7);

            values.put(ADDRESS, address);
            if (date != null) {
                values.put(DATE, date);
            }
            values.put(READ, read ? Integer.valueOf(1) : Integer.valueOf(0));
            values.put(SUBJECT, subject);
            values.put(BODY, body);
            if (deliveryReport) {
                values.put(STATUS, STATUS_PENDING);
            }
            if (threadId != -1L) {
                values.put(THREAD_ID, threadId);
            }
            return resolver.insert(uri, values);
        }

        /**
         * Move a message to the given folder.
         *
         * @param context the context to use
         * @param uri the message to move
         * @param folder the folder to move to
         * @return true if the operation succeeded
         */
        public static boolean moveMessageToFolder(Context context,
                Uri uri, int folder, int error) {
            if (uri == null) {
                return false;
            }

            boolean markAsUnread = false;
            boolean markAsRead = false;
            switch(folder) {
            case MESSAGE_TYPE_INBOX:
            case MESSAGE_TYPE_DRAFT:
                break;
            case MESSAGE_TYPE_OUTBOX:
            case MESSAGE_TYPE_SENT:
                markAsRead = true;
                break;
            case MESSAGE_TYPE_FAILED:
            case MESSAGE_TYPE_QUEUED:
                markAsUnread = true;
                break;
            default:
                return false;
            }

            ContentValues values = new ContentValues(3);

            values.put(TYPE, folder);
            if (markAsUnread) {
                values.put(READ, Integer.valueOf(0));
            } else if (markAsRead) {
                values.put(READ, Integer.valueOf(1));
            }
            values.put(ERROR_CODE, error);

            return 1 == SqliteWrapper.update(context, context.getContentResolver(),
                            uri, values, null, null);
        }

        /**
         * Returns true iff the folder (message type) identifies an
         * outgoing message.
         */
        public static boolean isOutgoingFolder(int messageType) {
            return  (messageType == MESSAGE_TYPE_FAILED)
                    || (messageType == MESSAGE_TYPE_OUTBOX)
                    || (messageType == MESSAGE_TYPE_SENT)
                    || (messageType == MESSAGE_TYPE_QUEUED);
        }

        /**
         * Contains all text based SMS messages in the SMS app's inbox.
         */
        public static final class Inbox implements BaseColumns, TextBasedSmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri CONTENT_URI =
                Uri.parse("content://sms/inbox");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";

            /**
             * Add an SMS to the Draft box.
             *
             * @param resolver the content resolver to use
             * @param address the address of the sender
             * @param body the body of the message
             * @param subject the psuedo-subject of the message
             * @param date the timestamp for the message
             * @param read true if the message has been read, false if not
             * @return the URI for the new message
             */
            public static Uri addMessage(ContentResolver resolver,
                    String address, String body, String subject, Long date,
                    boolean read) {
                return addMessageToUri(resolver, CONTENT_URI, address, body,
                        subject, date, read, false);
            }
        }

        /**
         * Contains all sent text based SMS messages in the SMS app's.
         */
        public static final class Sent implements BaseColumns, TextBasedSmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri CONTENT_URI =
                    Uri.parse("content://sms/sent");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";

            /**
             * Add an SMS to the Draft box.
             *
             * @param resolver the content resolver to use
             * @param address the address of the sender
             * @param body the body of the message
             * @param subject the psuedo-subject of the message
             * @param date the timestamp for the message
             * @return the URI for the new message
             */
            public static Uri addMessage(ContentResolver resolver,
                    String address, String body, String subject, Long date) {
                return addMessageToUri(resolver, CONTENT_URI, address, body,
                        subject, date, true, false);
            }
        }

        /**
         * Contains all sent text based SMS messages in the SMS app's.
         */
        public static final class Draft implements BaseColumns, TextBasedSmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri CONTENT_URI =
                    Uri.parse("content://sms/draft");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";

            /**
             * Add an SMS to the Draft box.
             *
             * @param resolver the content resolver to use
             * @param address the address of the sender
             * @param body the body of the message
             * @param subject the psuedo-subject of the message
             * @param date the timestamp for the message
             * @return the URI for the new message
             */
            public static Uri addMessage(ContentResolver resolver,
                    String address, String body, String subject, Long date) {
                return addMessageToUri(resolver, CONTENT_URI, address, body,
                        subject, date, true, false);
            }

            /**
             * Save over an existing draft message.
             *
             * @param resolver the content resolver to use
             * @param uri of existing message
             * @param body the new body for the draft message
             * @return true is successful, false otherwise
             */
            public static boolean saveMessage(ContentResolver resolver,
                    Uri uri, String body) {
                ContentValues values = new ContentValues(2);
                values.put(BODY, body);
                values.put(DATE, System.currentTimeMillis());
                return resolver.update(uri, values, null, null) == 1;
            }
        }

        /**
         * Contains all pending outgoing text based SMS messages.
         */
        public static final class Outbox implements BaseColumns, TextBasedSmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri CONTENT_URI =
                Uri.parse("content://sms/outbox");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";

            /**
             * Add an SMS to the Out box.
             *
             * @param resolver the content resolver to use
             * @param address the address of the sender
             * @param body the body of the message
             * @param subject the psuedo-subject of the message
             * @param date the timestamp for the message
             * @param deliveryReport whether a delivery report was requested for the message
             * @return the URI for the new message
             */
            public static Uri addMessage(ContentResolver resolver,
                    String address, String body, String subject, Long date,
                    boolean deliveryReport, long threadId) {
                return addMessageToUri(resolver, CONTENT_URI, address, body,
                        subject, date, true, deliveryReport, threadId);
            }
        }

        /**
         * Contains all sent text-based SMS messages in the SMS app's.
         */
        public static final class Conversations
                implements BaseColumns, TextBasedSmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri CONTENT_URI =
                Uri.parse("content://sms/conversations");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";

            /**
             * The first 45 characters of the body of the message
             * <P>Type: TEXT</P>
             */
            public static final String SNIPPET = "snippet";

            /**
             * The number of messages in the conversation
             * <P>Type: INTEGER</P>
             */
            public static final String MESSAGE_COUNT = "msg_count";
        }

        /**
         * Contains info about SMS related Intents that are broadcast.
         */
        public static final class Intents {
            /**
             * Set by BroadcastReceiver. Indicates the message was handled
             * successfully.
             */
            public static final int RESULT_SMS_HANDLED = 1;

            /**
             * Set by BroadcastReceiver. Indicates a generic error while
             * processing the message.
             */
            public static final int RESULT_SMS_GENERIC_ERROR = 2;

            /**
             * Set by BroadcastReceiver. Indicates insufficient memory to store
             * the message.
             */
            public static final int RESULT_SMS_OUT_OF_MEMORY = 3;

            /**
             * Set by BroadcastReceiver. Indicates the message, while
             * possibly valid, is of a format or encoding that is not
             * supported.
             */
            public static final int RESULT_SMS_UNSUPPORTED = 4;

            /**
             * Broadcast Action: A new text based SMS message has been received
             * by the device. The intent will have the following extra
             * values:</p>
             *
             * <ul>
             *   <li><em>pdus</em> - An Object[] od byte[]s containing the PDUs
             *   that make up the message.</li>
             * </ul>
             *
             * <p>The extra values can be extracted using
             * {@link #getMessagesFromIntent(Intent)}.</p>
             *
             * <p>If a BroadcastReceiver encounters an error while processing
             * this intent it should set the result code appropriately.</p>
             */
            @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
            public static final String SMS_RECEIVED_ACTION =
                    "android.provider.Telephony.SMS_RECEIVED";

            /**
             * Broadcast Action: A new data based SMS message has been received
             * by the device. The intent will have the following extra
             * values:</p>
             *
             * <ul>
             *   <li><em>pdus</em> - An Object[] of byte[]s containing the PDUs
             *   that make up the message.</li>
             * </ul>
             *
             * <p>The extra values can be extracted using
             * {@link #getMessagesFromIntent(Intent)}.</p>
             *
             * <p>If a BroadcastReceiver encounters an error while processing
             * this intent it should set the result code appropriately.</p>
             */
            @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
            public static final String DATA_SMS_RECEIVED_ACTION =
                    "android.intent.action.DATA_SMS_RECEIVED";

            /**
             * Broadcast Action: A new WAP PUSH message has been received by the
             * device. The intent will have the following extra
             * values:</p>
             *
             * <ul>
             *   <li><em>transactionId (Integer)</em> - The WAP transaction ID</li>
             *   <li><em>pduType (Integer)</em> - The WAP PDU type</li>
             *   <li><em>header (byte[])</em> - The header of the message</li>
             *   <li><em>data (byte[])</em> - The data payload of the message</li>
             *   <li><em>contentTypeParameters (HashMap<String,String>)</em>
             *   - Any parameters associated with the content type
             *   (decoded from the WSP Content-Type header)</li>
             * </ul>
             *
             * <p>If a BroadcastReceiver encounters an error while processing
             * this intent it should set the result code appropriately.</p>
             *
             * <p>The contentTypeParameters extra value is map of content parameters keyed by
             * their names.</p>
             *
             * <p>If any unassigned well-known parameters are encountered, the key of the map will
             * be 'unassigned/0x...', where '...' is the hex value of the unassigned parameter.  If
             * a parameter has No-Value the value in the map will be null.</p>
             */
            @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
            public static final String WAP_PUSH_RECEIVED_ACTION =
                    "android.provider.Telephony.WAP_PUSH_RECEIVED";

            /**
             * Broadcast Action: A new Cell Broadcast message has been received
             * by the device. The intent will have the following extra
             * values:</p>
             *
             * <ul>
             *   <li><em>pdus</em> - An Object[] of byte[]s containing the PDUs
             *   that make up the message.</li>
             * </ul>
             *
             * <p>The extra values can be extracted using
             * {@link #getMessagesFromIntent(Intent)}.</p>
             *
             * <p>If a BroadcastReceiver encounters an error while processing
             * this intent it should set the result code appropriately.</p>
             */
            @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
            public static final String SMS_CB_RECEIVED_ACTION =
                    "android.provider.Telephony.SMS_CB_RECEIVED";

            /**
             * Broadcast Action: A new Emergency Broadcast message has been received
             * by the device. The intent will have the following extra
             * values:</p>
             *
             * <ul>
             *   <li><em>pdus</em> - An Object[] of byte[]s containing the PDUs
             *   that make up the message.</li>
             * </ul>
             *
             * <p>The extra values can be extracted using
             * {@link #getMessagesFromIntent(Intent)}.</p>
             *
             * <p>If a BroadcastReceiver encounters an error while processing
             * this intent it should set the result code appropriately.</p>
             */
            @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
            public static final String SMS_EMERGENCY_CB_RECEIVED_ACTION =
                    "android.provider.Telephony.SMS_EMERGENCY_CB_RECEIVED";

            /**
             * Broadcast Action: The SIM storage for SMS messages is full.  If
             * space is not freed, messages targeted for the SIM (class 2) may
             * not be saved.
             */
            @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
            public static final String SIM_FULL_ACTION =
                    "android.provider.Telephony.SIM_FULL";

            /**
             * Broadcast Action: An incoming SMS has been rejected by the
             * telephony framework.  This intent is sent in lieu of any
             * of the RECEIVED_ACTION intents.  The intent will have the
             * following extra value:</p>
             *
             * <ul>
             *   <li><em>result</em> - An int result code, eg,
             *   <code>{@link #RESULT_SMS_OUT_OF_MEMORY}</code>,
             *   indicating the error returned to the network.</li>
             * </ul>

             */
            @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
            public static final String SMS_REJECTED_ACTION =
                "android.provider.Telephony.SMS_REJECTED";

            /**
             * Read the PDUs out of an {@link #SMS_RECEIVED_ACTION} or a
             * {@link #DATA_SMS_RECEIVED_ACTION} intent.
             *
             * @param intent the intent to read from
             * @return an array of SmsMessages for the PDUs
             */
            public static SmsMessage[] getMessagesFromIntent(
                    Intent intent) {
                Object[] messages = (Object[]) intent.getSerializableExtra("pdus");
                String format = intent.getStringExtra("format");
                byte[][] pduObjs = new byte[messages.length][];

                for (int i = 0; i < messages.length; i++) {
                    pduObjs[i] = (byte[]) messages[i];
                }
                byte[][] pdus = new byte[pduObjs.length][];
                int pduCount = pdus.length;
                SmsMessage[] msgs = new SmsMessage[pduCount];
                for (int i = 0; i < pduCount; i++) {
                    pdus[i] = pduObjs[i];
                    msgs[i] = SmsMessage.createFromPdu(pdus[i], format);
                }
                return msgs;
            }
        }
    }

 Inbox类：

public static final class Inbox implements BaseColumns, TextBasedSmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri CONTENT_URI =
                Uri.parse("content://sms/inbox");

}

类似的还有Sent、Draft、Outbox、Conversations这几个都implements BaseMmsColumns，跟Inbox不一样。

BaseMmsColumns的代码：

public interface BaseMmsColumns extends BaseColumns {

        public static final int MESSAGE_BOX_ALL    = 0;
        public static final int MESSAGE_BOX_INBOX  = 1;
        public static final int MESSAGE_BOX_SENT   = 2;
        public static final int MESSAGE_BOX_DRAFTS = 3;
        public static final int MESSAGE_BOX_OUTBOX = 4;

原来它是继承BaseColumns,在它基础上加了些变量。

1、Sms类：

/**
     * Contains all MMS and SMS messages.
     */
    public static final class MmsSms implements BaseColumns {
        /**
         * The column to distinguish SMS & MMS messages in query results.
         */
        public static final String TYPE_DISCRIMINATOR_COLUMN =
                "transport_type";

        public static final Uri CONTENT_URI = Uri.parse("content://mms-sms/");

        public static final Uri CONTENT_CONVERSATIONS_URI = Uri.parse(
                "content://mms-sms/conversations");

        public static final Uri CONTENT_FILTER_BYPHONE_URI = Uri.parse(
                "content://mms-sms/messages/byphone");

        public static final Uri CONTENT_UNDELIVERED_URI = Uri.parse(
                "content://mms-sms/undelivered");

        public static final Uri CONTENT_DRAFT_URI = Uri.parse(
                "content://mms-sms/draft");

        public static final Uri CONTENT_LOCKED_URI = Uri.parse(
                "content://mms-sms/locked");

        /***
         * Pass in a query parameter called "pattern" which is the text
         * to search for.
         * The sort order is fixed to be thread_id ASC,date DESC.
         */
        public static final Uri SEARCH_URI = Uri.parse(
                "content://mms-sms/search");

        // Constants for message protocol types.
        public static final int SMS_PROTO = 0;
        public static final int MMS_PROTO = 1;

        // Constants for error types of pending messages.
        public static final int NO_ERROR                      = 0;
        public static final int ERR_TYPE_GENERIC              = 1;
        public static final int ERR_TYPE_SMS_PROTO_TRANSIENT  = 2;
        public static final int ERR_TYPE_MMS_PROTO_TRANSIENT  = 3;
        public static final int ERR_TYPE_TRANSPORT_FAILURE    = 4;
        public static final int ERR_TYPE_GENERIC_PERMANENT    = 10;
        public static final int ERR_TYPE_SMS_PROTO_PERMANENT  = 11;
        public static final int ERR_TYPE_MMS_PROTO_PERMANENT  = 12;

        public static final class PendingMessages implements BaseColumns {
            public static final Uri CONTENT_URI = Uri.withAppendedPath(
                    MmsSms.CONTENT_URI, "pending");
            /**
             * The type of transport protocol(MMS or SMS).
             * <P>Type: INTEGER</P>
             */
            public static final String PROTO_TYPE = "proto_type";
            /**
             * The ID of the message to be sent or downloaded.
             * <P>Type: INTEGER</P>
             */
            public static final String MSG_ID = "msg_id";
            /**
             * The type of the message to be sent or downloaded.
             * This field is only valid for MM. For SM, its value is always
             * set to 0.
             */
            public static final String MSG_TYPE = "msg_type";
            /**
             * The type of the error code.
             * <P>Type: INTEGER</P>
             */
            public static final String ERROR_TYPE = "err_type";
            /**
             * The error code of sending/retrieving process.
             * <P>Type:  INTEGER</P>
             */
            public static final String ERROR_CODE = "err_code";
            /**
             * How many times we tried to send or download the message.
             * <P>Type:  INTEGER</P>
             */
            public static final String RETRY_INDEX = "retry_index";
            /**
             * The time to do next retry.
             */
            public static final String DUE_TIME = "due_time";
            /**
             * The time we last tried to send or download the message.
             */
            public static final String LAST_TRY = "last_try";
        }

        public static final class WordsTable {
            public static final String ID = "_id";
            public static final String SOURCE_ROW_ID = "source_id";
            public static final String TABLE_ID = "table_to_use";
            public static final String INDEXED_TEXT = "index_text";
        }
    }

2、Mms类：

/**
     * Contains all MMS messages.
     */
    public static final class Mms implements BaseMmsColumns {
        /**
         * The content:// style URL for this table
         */
        public static final Uri CONTENT_URI = Uri.parse("content://mms");

        public static final Uri REPORT_REQUEST_URI = Uri.withAppendedPath(
                                            CONTENT_URI, "report-request");

        public static final Uri REPORT_STATUS_URI = Uri.withAppendedPath(
                                            CONTENT_URI, "report-status");

        /**
         * The default sort order for this table
         */
        public static final String DEFAULT_SORT_ORDER = "date DESC";

        /**
         * mailbox         =       name-addr
         * name-addr       =       [display-name] angle-addr
         * angle-addr      =       [CFWS] "<" addr-spec ">" [CFWS]
         */
        public static final Pattern NAME_ADDR_EMAIL_PATTERN =
                Pattern.compile("\\s*(\"[^\"]*\"|[^<>\"]+)\\s*<([^<>]+)>\\s*");

        /**
         * quoted-string   =       [CFWS]
         *                         DQUOTE *([FWS] qcontent) [FWS] DQUOTE
         *                         [CFWS]
         */
        public static final Pattern QUOTED_STRING_PATTERN =
                Pattern.compile("\\s*\"([^\"]*)\"\\s*");

        public static final Cursor query(
                ContentResolver cr, String[] projection) {
            return cr.query(CONTENT_URI, projection, null, null, DEFAULT_SORT_ORDER);
        }

        public static final Cursor query(
                ContentResolver cr, String[] projection,
                String where, String orderBy) {
            return cr.query(CONTENT_URI, projection,
                    where, null, orderBy == null ? DEFAULT_SORT_ORDER : orderBy);
        }

        public static final String getMessageBoxName(int msgBox) {
            switch (msgBox) {
                case MESSAGE_BOX_ALL:
                    return "all";
                case MESSAGE_BOX_INBOX:
                    return "inbox";
                case MESSAGE_BOX_SENT:
                    return "sent";
                case MESSAGE_BOX_DRAFTS:
                    return "drafts";
                case MESSAGE_BOX_OUTBOX:
                    return "outbox";
                default:
                    throw new IllegalArgumentException("Invalid message box: " + msgBox);
            }
        }

        public static String extractAddrSpec(String address) {
            Matcher match = NAME_ADDR_EMAIL_PATTERN.matcher(address);

            if (match.matches()) {
                return match.group(2);
            }
            return address;
        }

        /**
         * Returns true if the address is an email address
         *
         * @param address the input address to be tested
         * @return true if address is an email address
         */
        public static boolean isEmailAddress(String address) {
            if (TextUtils.isEmpty(address)) {
                return false;
            }

            String s = extractAddrSpec(address);
            Matcher match = Patterns.EMAIL_ADDRESS.matcher(s);
            return match.matches();
        }

        /**
         * Returns true if the number is a Phone number
         *
         * @param number the input number to be tested
         * @return true if number is a Phone number
         */
        public static boolean isPhoneNumber(String number) {
            if (TextUtils.isEmpty(number)) {
                return false;
            }

            Matcher match = Patterns.PHONE.matcher(number);
            return match.matches();
        }

        /**
         * Contains all MMS messages in the MMS app's inbox.
         */
        public static final class Inbox implements BaseMmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri
                    CONTENT_URI = Uri.parse("content://mms/inbox");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";
        }

        /**
         * Contains all MMS messages in the MMS app's sent box.
         */
        public static final class Sent implements BaseMmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri
                    CONTENT_URI = Uri.parse("content://mms/sent");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";
        }

        /**
         * Contains all MMS messages in the MMS app's drafts box.
         */
        public static final class Draft implements BaseMmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri
                    CONTENT_URI = Uri.parse("content://mms/drafts");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";
        }

        /**
         * Contains all MMS messages in the MMS app's outbox.
         */
        public static final class Outbox implements BaseMmsColumns {
            /**
             * The content:// style URL for this table
             */
            public static final Uri
                    CONTENT_URI = Uri.parse("content://mms/outbox");

            /**
             * The default sort order for this table
             */
            public static final String DEFAULT_SORT_ORDER = "date DESC";
        }

        public static final class Addr implements BaseColumns {
            /**
             * The ID of MM which this address entry belongs to.
             */
            public static final String MSG_ID = "msg_id";

            /**
             * The ID of contact entry in Phone Book.
             */
            public static final String CONTACT_ID = "contact_id";

            /**
             * The address text.
             */
            public static final String ADDRESS = "address";

            /**
             * Type of address, must be one of PduHeaders.BCC,
             * PduHeaders.CC, PduHeaders.FROM, PduHeaders.TO.
             */
            public static final String TYPE = "type";

            /**
             * Character set of this entry.
             */
            public static final String CHARSET = "charset";
        }

        public static final class Part implements BaseColumns {
            /**
             * The identifier of the message which this part belongs to.
             * <P>Type: INTEGER</P>
             */
            public static final String MSG_ID = "mid";

            /**
             * The order of the part.
             * <P>Type: INTEGER</P>
             */
            public static final String SEQ = "seq";

            /**
             * The content type of the part.
             * <P>Type: TEXT</P>
             */
            public static final String CONTENT_TYPE = "ct";

            /**
             * The name of the part.
             * <P>Type: TEXT</P>
             */
            public static final String NAME = "name";

            /**
             * The charset of the part.
             * <P>Type: TEXT</P>
             */
            public static final String CHARSET = "chset";

            /**
             * The file name of the part.
             * <P>Type: TEXT</P>
             */
            public static final String FILENAME = "fn";

            /**
             * The content disposition of the part.
             * <P>Type: TEXT</P>
             */
            public static final String CONTENT_DISPOSITION = "cd";

            /**
             * The content ID of the part.
             * <P>Type: INTEGER</P>
             */
            public static final String CONTENT_ID = "cid";

            /**
             * The content location of the part.
             * <P>Type: INTEGER</P>
             */
            public static final String CONTENT_LOCATION = "cl";

            /**
             * The start of content-type of the message.
             * <P>Type: INTEGER</P>
             */
            public static final String CT_START = "ctt_s";

            /**
             * The type of content-type of the message.
             * <P>Type: TEXT</P>
             */
            public static final String CT_TYPE = "ctt_t";

            /**
             * The location(on filesystem) of the binary data of the part.
             * <P>Type: INTEGER</P>
             */
            public static final String _DATA = "_data";

            public static final String TEXT = "text";

        }

        public static final class Rate {
            public static final Uri CONTENT_URI = Uri.withAppendedPath(
                    Mms.CONTENT_URI, "rate");
            /**
             * When a message was successfully sent.
             * <P>Type: INTEGER</P>
             */
            public static final String SENT_TIME = "sent_time";
        }

        public static final class Intents {
            private Intents() {
                // Non-instantiatable.
            }

            /**
             * The extra field to store the contents of the Intent,
             * which should be an array of Uri.
             */
            public static final String EXTRA_CONTENTS = "contents";
            /**
             * The extra field to store the type of the contents,
             * which should be an array of String.
             */
            public static final String EXTRA_TYPES    = "types";
            /**
             * The extra field to store the 'Cc' addresses.
             */
            public static final String EXTRA_CC       = "cc";
            /**
             * The extra field to store the 'Bcc' addresses;
             */
            public static final String EXTRA_BCC      = "bcc";
            /**
             * The extra field to store the 'Subject'.
             */
            public static final String EXTRA_SUBJECT  = "subject";
            /**
             * Indicates that the contents of specified URIs were changed.
             * The application which is showing or caching these contents
             * should be updated.
             */
            public static final String
            CONTENT_CHANGED_ACTION = "android.intent.action.CONTENT_CHANGED";
            /**
             * An extra field which stores the URI of deleted contents.
             */
            public static final String DELETED_CONTENTS = "deleted_contents";
        }
    }

三、SmsProvider.java

The class to provide base facility to access MMS related content, which is stored in a SQLite database and in the file system.

短信的uri以content://sms开头。

可以使用Telephony中的Sms类提供的公共变量进行构造Uri，甚至使用其中提供的一些addMessage（将信息存入各个不同的信箱）、saveMessage（更新已存在的草稿）、addMessageToUri（插入数据到指定Uri）、moveMessageToFolder（将信息移到某一信箱）方法简化操作。

UriMatcher中配置了27种类型：