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) { }            }        }