android Mms 数据库1

简介

Mms 数据库代码的位置在/packages/providers/TelephonyProvider，这里还包括APN的部分。从AndroidManifest中可以看到，其注明sharedUserId为android.uid.phone，运行在com.android.phone进程中。TelephonyProvider是APN的数据库，SmsProvider、MmsProvider、MmsSmsProvider为Mms的数据库。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.android.providers.telephony"
        coreApp="true"
        android:sharedUserId="android.uid.phone">

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

    <application android:process="com.android.phone"
                 android:allowClearUserData="false"
                 android:allowBackup="false"
                 android:label="@string/app_label"
                 android:icon="@drawable/ic_launcher_phone">

        <provider android:name="TelephonyProvider"
                  android:authorities="telephony"
                  android:multiprocess="true" />

        <provider android:name="SmsProvider"
                  android:authorities="sms"
                  android:multiprocess="true"
                  android:readPermission="android.permission.READ_SMS"
                  android:writePermission="android.permission.WRITE_SMS" />

        <provider android:name="MmsProvider"
                  android:authorities="mms"
                  android:multiprocess="true"
                  android:readPermission="android.permission.READ_SMS"
                  android:writePermission="android.permission.WRITE_SMS">
            <grant-uri-permission android:pathPrefix="/part/" />
            <grant-uri-permission android:pathPrefix="/drm/" />
        </provider>

        <provider android:name="MmsSmsProvider"
                  android:authorities="mms-sms"
                  android:multiprocess="true"
                  android:readPermission="android.permission.READ_SMS"
                  android:writePermission="android.permission.WRITE_SMS" />
    </application>
</manifest>

关于APN数据

APN数据项参考其数据库的建立：

        @Override
        public void onCreate(SQLiteDatabase db) {
            // Set up the database schema
            db.execSQL("CREATE TABLE " + CARRIERS_TABLE +
                "(_id INTEGER PRIMARY KEY," +
                    "name TEXT," +
                    "numeric TEXT," +
                    "mcc TEXT," +
                    "mnc TEXT," +
                    "apn TEXT," +
                    "user TEXT," +
                    "server TEXT," +
                    "password TEXT," +
                    "proxy TEXT," +
                    "port TEXT," +
                    "mmsproxy TEXT," +
                    "mmsport TEXT," +
                    "mmsc TEXT," +
                    "authtype INTEGER," +
                    "type TEXT," +
                    "current INTEGER," +
                    "protocol TEXT," +
                    "roaming_protocol TEXT," +
                    "carrier_enabled BOOLEAN," +
                    "bearer INTEGER);");

            initDatabase(db);
        }

APN数据的载入流程：

1. 读取internal APNS data，位于$ANDROID_SRC_HOME/frameworks/base/core/res/res/xml/apns.xml

这个文件实际上是提供了一个version的值publicversion，这个值在载入实际的APN配置时会起作用（也就是external APNS时）

2. 读取external APNS data，位于$ANDROID_SRC_HOME/out/target/product/generic/system/etc/apns-conf.xml

3. CARRIERS_TABLE中的"current INTEGER"项指定目前使用的APN设置

        private void initDatabase(SQLiteDatabase db) {
            // Read internal APNS data
            Resources r = mContext.getResources();
            XmlResourceParser parser = r.getXml(com.android.internal.R.xml.apns);
            int publicversion = -1;
            try {
                XmlUtils.beginDocument(parser, "apns");
                publicversion = Integer.parseInt(parser.getAttributeValue(null, "version"));
                loadApns(db, parser);
            } catch (Exception e) {
                Log.e(TAG, "Got exception while loading APN database.", e);
            } finally {
                parser.close();
            }

           // Read external APNS data (partner-provided)
            XmlPullParser confparser = null;
            // Environment.getRootDirectory() is a fancy way of saying ANDROID_ROOT or "/system".
            File confFile = new File(Environment.getRootDirectory(), PARTNER_APNS_PATH);
            FileReader confreader = null;
            try {
                confreader = new FileReader(confFile);
                confparser = Xml.newPullParser();
                confparser.setInput(confreader);
                XmlUtils.beginDocument(confparser, "apns");

                // Sanity check. Force internal version and confidential versions to agree
                int confversion = Integer.parseInt(confparser.getAttributeValue(null, "version"));
                if (publicversion != confversion) {
                    throw new IllegalStateException("Internal APNS file version doesn't match "
                            + confFile.getAbsolutePath());
                }

                loadApns(db, confparser);
            } catch (FileNotFoundException e) {
                // It's ok if the file isn't found. It means there isn't a confidential file
                // Log.e(TAG, "File not found: '" + confFile.getAbsolutePath() + "'");
            } catch (Exception e) {
                Log.e(TAG, "Exception while parsing '" + confFile.getAbsolutePath() + "'", e);
            } finally {
                try { if (confreader != null) confreader.close(); } catch (IOException e) { }
            }
        }