Android APN的设置问题
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1、问题的引入
???????在android源码，成功执行了make?和?make sdk，也最终烧到开发板上了！不幸的是插入SIM卡却无法上网，必须手动设置APN后才能上网，而有些“菜鸟级”用户却无从下手，就需要我们开发者给他提供方便了！如何保证在插入SIM卡后就已经自动设置好APN呢？此时只要用户轻轻一点对应指定SIM卡的APN就OK了！
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2、问题的分析
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2-1、apn的流程分析及相关文件
首先配置环境变量 ，在~/.bashrc文件中添加
export ANDROID_SRC_HOME?= /mnt/yqmiao/android_2.1
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相关文件作如下简单说明：
main.mk?-- $ANDROID_SRC_HOME/build/core/main.mk
--从该文件[核心Makefile文件]中可以看出有关apn设置的xml文件
摘录如下：
#?Install an apns-conf.xml file if one's not already being installed.
ifeq (,$(filter %:system/etc/apns-conf.xml, $(PRODUCT_COPY_FILES)))
? PRODUCT_COPY_FILES += \
????????development/data/etc/apns-conf_sdk.xml:system/etc/apns-conf.xml
? ifeq ($(filter eng tests,$(TARGET_BUILD_VARIANT)),)
??? $(warning implicitly installing apns-conf_sdk.xml)
? endif
endif
ifeq (,$(filter %:system/etc/apns-conf.xml, $(PRODUCT_COPY_FILES)))
? PRODUCT_COPY_FILES += \
????????development/data/etc/apns-conf_sdk.xml:system/etc/apns-conf.xml
? ifeq ($(filter eng tests,$(TARGET_BUILD_VARIANT)),)
??? $(warning implicitly installing apns-conf_sdk.xml)
? endif
endif
apns-conf_sdk.xml?-- $ANDROID_SRC_HOME/development/data/etc/apns-conf_sdk.xml
--主要用于生成system/etc/apns-conf.xml文件，生成过程本质上就是原文拷贝
apns.xml?-- $ANDROID_SRC_HOME/frameworks/base/core/res/res/xml/apns.xml
--该文件实际上在apn的设置方面没有实际意义，然而在android apn设置的逻辑方面却很重要，尤其是里面的version的值。
apns-conf.xml?-- $ANDROID_SRC_HOME/out/target/product/generic/system/etc/apns-conf.xml
--该内容最终打包到system.img中：
效果查看：
1)运行模拟器
[email protected]:$ANDROID_SRC_HOME/out/target/product/generic#../../../host/linux-x86/bin/emulator -system system.img -data userdata.img -ramdisk ramdisk.img
2）进入terminate
adb shell
cat /system/etc/apns-conf.xml?
注：此文件就是来源于此！！
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TelephonyProvider.java?--? $ANDROID_SRC_HOME/packages/providers/TelephonyProvider/src/com/android/providers/telephony/TelephonyProvider.java
--该class主要用于APN的设置，由于源码提供的不符合定制要求，所以要手动修改！
但是修改最终目的是保证在数据库version更新后，能够及时更新维护APN的数据库表内容！
具体该类如何修改，下文会阐述！
首先保证成功运行了Emulator或开发板，查看APN所维护的数据，操作如下：
# adb shell
# cd /data/data/com.android.providers.telephony/databases
# cd /data/data/com.android.providers.telephony/databases
# sqlite3 telephony.db
sqlite> .dump carriers
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2-2、具体修改实现
*************修改apns-conf_sdk.xml文件***********
添加新的apn设置
eg:
<apn carrier="中国联通"?
??? apn="3gnet"?
??? proxy=""?
??? port=""?
??? user=""?
??? password=""?
??? server=""?
??? mmsc=""?
??? mcc="460"?
??? mnc="01"
??? mmsproxy=""?
??? mmsport=""?
??? type=""
/>
??? apn="3gnet"?
??? proxy=""?
??? port=""?
??? user=""?
??? password=""?
??? server=""?
??? mmsc=""?
??? mcc="460"?
??? mnc="01"
??? mmsproxy=""?
??? mmsport=""?
??? type=""
/>
其中的一些属性即使是赋空字符串，也不可以去掉。
修改version的值，保证比原始值大：
<apns version="7">
...
</apns>
**************修改apns.xml文件******************
修改version的值，保证比原始值大，并且要和上一步设置的version的值相同
eg:
<apns version="7">...</apns>以后每一次修改APN都要修改version的值?**************修改TelephonyProvider.java 文件*******
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修改的目的，上面已提及！
eg1:
[email protected]
??????? public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
?????????if(oldVersion < newVersion)
??????? ?{
??????? public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
?????????if(oldVersion < newVersion)
??????? ?{
??????????final int count = db.delete(CARRIERS_TABLE, null, null) ;??????????
??????????initDatabase(db) ;
??????? ?}
??????? }
??????? ?}
??????? }
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eg2:
[email protected]
??????? public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
??????????? if (oldVersion < newVersion) {
?????????????db.beginTransaction() ;
??????????? ?db.execSQL("DROP TABLE IF EXISTS " + CARRIERS_TABLE + ";") ;
??????????? ?db.execSQL("CREATE TABLE IF NOT EXISTS " + 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);") ;
??????????? ?db.endTransaction() ;
??????????? ?initDatabase(db) ;
??????????? }
??????? }
??????? public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
??????????? if (oldVersion < newVersion) {
?????????????db.beginTransaction() ;
??????????? ?db.execSQL("DROP TABLE IF EXISTS " + CARRIERS_TABLE + ";") ;
??????????? ?db.execSQL("CREATE TABLE IF NOT EXISTS " + 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);") ;
??????????? ?db.endTransaction() ;
??????????? ?initDatabase(db) ;
??????????? }
??????? }
经过测试发下,eg2可能会更好！
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2-3、编译make
[email protected]:/mnt/yqmiao/android_2.1# . ./build/envsetup.sh
[email protected]:/mnt/yqmiao/android_2.1#make
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make结束以后，若没有配置，那么配置如下：
eg:
1)在~/.bashrc文件中添加如下：
export ANDROID_SRC_HOME = /mnt/yqmiao/android_2.1
export PATH=$PATH:$ANDROID_SRC_HOME /out/host/linux-x86/bin
exportANDROID_PRODUCT_OUT=$ANDROID_SRC_HOME/out/target/product/generic
export PATH=$PATH:$ANDROID_SRC_HOME /out/host/linux-x86/bin
exportANDROID_PRODUCT_OUT=$ANDROID_SRC_HOME/out/target/product/generic
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2)保存退出后：
source? ~/.bashrc
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3)然后运行Emulator
emulator
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3、结果验证
1)
在模拟器成功启动以后，进入telephony.db数据库中的carriers表中进行查看！
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2)
在开发板上插入SIM卡后，进入APN设置页面查看
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4、结论分析
1）android源码不支持本地化[不同国家及服务提供商]的APN自动化设置。
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2）有些论坛提及如何配置APN，然而没有提及修改version的值及修改java源
代码，只是简单地在apns-conf_sdk.xml文件中添加新的apn，所以总是失败而终，究其原因TelephonyProvider.java文件无法保证新增APN添加到telephony.db中，本质原因还是ContentProvider的生命周期决定的，onCreate只是在第一次运行时执行，以后就不会再执行了；此后需要通过onUpdate来更新db的table，此时就需要修改db的version了。
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3）希望读者们修改顺利！！
本文出自 “苗运齐的博客” 博客，请务必保留此出处http://myqdroid.blog.51cto.com/2057579/389134
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