default、mms、supl、dun、hipri接入点类型的区别

设置APN上网时，大家可能经常遇到这个问题：
为什么有时要填写default有时要填写supl，而彩信又偏偏要mms？
这个问题留到最后，让我们看看每个接入点类型的含义：
英文原文来自于Google Android Developers
原文连接:http://developer.android.com/reference/android/net/ConnectivityManager.html
我尽量用通俗易懂的语言来解释每个类型的含义，若您是开发者，请尽量阅读英文原文。

1、default

?默认网络连接，当激活时所有数据传输都使用该连接，不能与其他网络连接同时使用

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"color: rgb(8, 0, 0); font-style: italic; font-weight: bold;">/** * The Default Mobile data connection. When active, all data traffic * will use this connection by default. Should not coexist with other * default connections. */ "color: rgb(0, 0, 0); font-weight: bold;">public "color: rgb(0, 0, 0); font-weight: bold;">static "color: rgb(0, 0, 0); font-weight: bold;">final "color: rgb(0, 102, 0); font-weight: bold;">int TYPE_MOBILE "color: rgb(51, 153, 51);">= "color: rgb(204, 102, 204);">0"color: rgb(51, 153, 51);">; "color:#880000;font-style: italic; font-weight: bold;">/** * The Default Mobile data connection. When active, all data traffic * will use this connection by default. Should not coexist with other * default connections. */ "color:#000000;font-weight: bold;">public "color:#000000;font-weight: bold;">static "color:#000000;font-weight: bold;">final "color:#0660;font-weight: bold;">int TYPE_MOBILE "color:#339933;">= "color:#cc66cc;">0"color:#339933;">; /** * The Default Mobile data connection. When active, all data traffic * will use this connection by default. Should not coexist with other * default connections. */ public static final int TYPE_MOBILE = 0;

适用场合：绝大部分正常上网时可以使用

2、mms

彩信专用连接，此连接与default类似，用于与载体的多媒体信息服务器对话的应用程序，此连接能与default连接同时使用

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"color: rgb(8, 0, 0); font-style: italic; font-weight: bold;">/** * An MMS-specific Mobile data connection. This connection may be the * same as TYPE_MOBILE but it may be different. This is used * by applications needing to talk to the carrier's Multimedia Messaging * Service servers. It may coexist with default data connections. */ "color: rgb(0, 0, 0); font-weight: bold;">public "color: rgb(0, 0, 0); font-weight: bold;">static "color: rgb(0, 0, 0); font-weight: bold;">final "color: rgb(0, 102, 0); font-weight: bold;">int TYPE_MOBILE_MMS "color: rgb(51, 153, 51);">= "color: rgb(204, 102, 204);">2"color: rgb(51, 153, 51);">; "color:#880000;font-style: italic; font-weight: bold;">/** * An MMS-specific Mobile data connection. This connection may be the * same as TYPE_MOBILE but it may be different. This is used * by applications needing to talk to the carrier's Multimedia Messaging * Service servers. It may coexist with default data connections. */ "color:#000000;font-weight: bold;">public "color:#000000;font-weight: bold;">static "color:#000000;font-weight: bold;">final "color:#0660;font-weight: bold;">int TYPE_MOBILE_MMS "color:#339933;">= "color:#cc66cc;">2"color:#339933;">; /** * An MMS-specific Mobile data connection. This connection may be the * same as TYPE_MOBILE but it may be different. This is used * by applications needing to talk to the carrier's Multimedia Messaging * Service servers. It may coexist with default data connections. */ public static final int TYPE_MOBILE_MMS = 2;

适用场合：使用彩信服务时，必须有mms类型的接入点，不必选中，应用程序会自动使用此接入点

3、supl

是Secure User Plane Location“安全用户面定位”的简写，此连接与default类似，用于帮助定位设备与载体的安全用户面定位服务器对话的应用程序，此连接能与default连接同时使用

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"color: rgb(8, 0, 0); font-style: italic; font-weight: bold;">/** * A SUPL-specific Mobile data connection. This connection may be the * same as {@link #TYPEMOBILE} but it may be different. This is used * by applications needing to talk to the carrier's Secure User Plane * Location servers for help locating the device. It may coexist with * default data connections. * {@hide} */ "color: rgb(0, 0, 0); font-weight: bold;">public "color: rgb(0, 0, 0); font-weight: bold;">static "color: rgb(0, 0, 0); font-weight: bold;">final "color: rgb(0, 102, 0); font-weight: bold;">int TYPE_MOBILE_SUPL "color: rgb(51, 153, 51);">= "color: rgb(204, 102, 204);">3"color: rgb(51, 153, 51);">; "color:#880000;font-style: italic; font-weight: bold;">/** * A SUPL-specific Mobile data connection. This connection may be the * same as {@link #TYPEMOBILE} but it may be different. This is used * by applications needing to talk to the carrier's Secure User Plane * Location servers for help locating the device. It may coexist with * default data connections. * {@hide} */ "color:#000000;font-weight: bold;">public "color:#000000;font-weight: bold;">static "color:#000000;font-weight: bold;">final "color:#0660;font-weight: bold;">int TYPE_MOBILE_SUPL "color:#339933;">= "color:#cc66cc;">3"color:#339933;">; /** * A SUPL-specific Mobile data connection. This connection may be the * same as {@link #TYPEMOBILE} but it may be different. This is used * by applications needing to talk to the carrier's Secure User Plane * Location servers for help locating the device. It may coexist with * default data connections. * {@hide} */ public static final int TYPE_MOBILE_SUPL = 3;

适用场合:需要自动切换wap与net接入点的、需要把手机当临时AP的
对SUPL技术感兴趣的朋友，不妨看下以下文章
SUPL技术(一)http://blog.sina.com.cn/s/blog_537f4a11010008tw.html
SUPL技术(二)http://blog.sina.com.cn/s/blog_537f4a11010008uf.html
SUPL技术(三)http://blog.sina.com.cn/s/blog_537f4a11010008ws.html
SUPL技术(四)http://blog.sina.com.cn/s/blog_537f4a11010008yf.html

4、dun

Dial Up Networking拨号网络的简称，此连接与default连接类似，用于执行一个拨号网络网桥，使载体能知道拨号网络流量的应用程序，此连接能与default连接同时使用

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"color: rgb(8, 0, 0); font-style: italic; font-weight: bold;">/** * A DUN-specific Mobile data connection. This connection may be the * same as {@link #TYPEMOBILE} but it may be different. This is used * by applicaitons performing a Dial Up Networking bridge so that * the carrier is aware of DUN traffic. It may coexist with default data * connections. */ "color: rgb(0, 0, 0); font-weight: bold;">public "color: rgb(0, 0, 0); font-weight: bold;">static "color: rgb(0, 0, 0); font-weight: bold;">final "color: rgb(0, 102, 0); font-weight: bold;">int TYPE_MOBILE_DUN "color: rgb(51, 153, 51);">= "color: rgb(204, 102, 204);">4"color: rgb(51, 153, 51);">; "color:#880000;font-style: italic; font-weight: bold;">/** * A DUN-specific Mobile data connection. This connection may be the * same as {@link #TYPEMOBILE} but it may be different. This is used * by applicaitons performing a Dial Up Networking bridge so that * the carrier is aware of DUN traffic. It may coexist with default data * connections. */ "color:#000000;font-weight: bold;">public "color:#000000;font-weight: bold;">static "color:#000000;font-weight: bold;">final "color:#0660;font-weight: bold;">int TYPE_MOBILE_DUN "color:#339933;">= "color:#cc66cc;">4"color:#339933;">; /** * A DUN-specific Mobile data connection. This connection may be the * same as {@link #TYPEMOBILE} but it may be different. This is used * by applicaitons performing a Dial Up Networking bridge so that * the carrier is aware of DUN traffic. It may coexist with default data * connections. */ public static final int TYPE_MOBILE_DUN = 4;

适用场合：需要使用运营商无线热点的，CMCC、ChinaNet等

5、hipri

高优先级网络，与default类似，但路由设置不同。
只有当进程访问移动DNS服务器，并明确要求使用requestRouteToHost(int, int)才会使用此连接
（这个我也不太懂，翻译的应该很有问题….）

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"color: rgb(8, 0, 0); font-style: italic; font-weight: bold;">/** * A High Priority Mobile data connection. This connection is typically * the same as {@link #TYPEMOBILE} but the routing setup is different. * Only requesting processes will have access to the Mobile DNS servers * and only IP's explicitly requested via {@link #requestRouteToHost} * will route over this interface. *{@hide} */ "color: rgb(0, 0, 0); font-weight: bold;">public "color: rgb(0, 0, 0); font-weight: bold;">static "color: rgb(0, 0, 0); font-weight: bold;">final "color: rgb(0, 102, 0); font-weight: bold;">int TYPE_MOBILE_HIPRI "color: rgb(51, 153, 51);">= "color: rgb(204, 102, 204);">5"color: rgb(51, 153, 51);">; "color:#880000;font-style: italic; font-weight: bold;">/** * A High Priority Mobile data connection. This connection is typically * the same as {@link #TYPEMOBILE} but the routing setup is different. * Only requesting processes will have access to the Mobile DNS servers * and only IP's explicitly requested via {@link #requestRouteToHost} * will route over this interface. *{@hide} */ "color:#000000;font-weight: bold;">public "color:#000000;font-weight: bold;">static "color:#000000;font-weight: bold;">final "color:#0660;font-weight: bold;">int TYPE_MOBILE_HIPRI "color:#339933;">= "color:#cc66cc;">5"color:#339933;">; /** * A High Priority Mobile data connection. This connection is typically * the same as {@link #TYPEMOBILE} but the routing setup is different. * Only requesting processes will have access to the Mobile DNS servers * and only IP's explicitly requested via {@link #requestRouteToHost} * will route over this interface. *{@hide} */ public static final int TYPE_MOBILE_HIPRI = 5;

适用场合：我也不知道……

好了，最后教给大家一个一劳永逸的APN设置大法：2个接入点搞定一切
以下内容分运营商的地方我会标注出来，默认以中国联通3G为例

1、NET接入点

接入点名称任意
APN：3gnet(移动2g:cmnet 联通2g:uninet)
接入点类型:default,supl,dun
其他都为空

2、WAP接入点

APN:3gwap(移动2g:cmwap 联通2g:uniwap)
代理:10.0.0.172
端口:80
mmsc:http://mmsc.myuni.com.cn(此项不区分2G3G，移动:http://mmsc.monternet.com)
彩信代理:10.0.0.172
彩信端口:80
APN类型:default,mms
好了，搞定~
现在我想文章开头处的问题就不需要再解答了吧？