APN(default、mms、supl、dun、hipri接入點類型的區別)

設置APN上網時，大家可能經常遇到這個問題：
爲什麼有時要填寫default有時要填寫supl，而彩信又偏偏要mms？
這個問題留到最後，讓我們看看每個接入點類型的含義：
英文原文來自於Google Android Developers
原文連接:http://developer.android.com/reference/android/net/ConnectivityManager.html
我儘量用通俗易懂的語言來解釋每個類型的含義，若您是開發者，請儘量閱讀英文原文。

1、default
‍默認網絡連接，當激活時所有數據傳輸都使用該連接，不能與其他網絡連接同時使用

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<span style="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. */</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">final</span> <span style="color: rgb(0, 102, 0); font-weight: bold;">int</span> TYPE_MOBILE <span style="color: rgb(51, 153, 51);">=</span> <span style="color: rgb(204, 102, 204);">0</span><span style="color: rgb(51, 153, 51);">;</span> <span style="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. */</span> <span style="color:#000000;font-weight: bold;">public</span> <span style="color:#000000;font-weight: bold;">static</span> <span style="color:#000000;font-weight: bold;">final</span> <span style="color:#0660;font-weight: bold;">int</span> TYPE_MOBILE <span style="color:#339933;">=</span> <span style="color:#cc66cc;">0</span><span style="color:#339933;">;</span>

適用場合：絕大部分正常上網時可以使用
2、mms
彩信專用連接，此連接與default類似，用於與載體的多媒體信息服務器對話的應用程序，此連接能與default連接同時使用

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<span style="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. */</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">final</span> <span style="color: rgb(0, 102, 0); font-weight: bold;">int</span> TYPE_MOBILE_MMS <span style="color: rgb(51, 153, 51);">=</span> <span style="color: rgb(204, 102, 204);">2</span><span style="color: rgb(51, 153, 51);">;</span> <span style="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. */</span> <span style="color:#000000;font-weight: bold;">public</span> <span style="color:#000000;font-weight: bold;">static</span> <span style="color:#000000;font-weight: bold;">final</span> <span style="color:#0660;font-weight: bold;">int</span> TYPE_MOBILE_MMS <span style="color:#339933;">=</span> <span style="color:#cc66cc;">2</span><span style="color:#339933;">;</span>

適用場合：使用彩信服務時，必須有mms類型的接入點，不必選中，應用程序會自動使用此接入點
3、supl
是Secure User Plane Location“安全用戶面定位”的簡寫，此連接與default類似，用於幫助定位設備與載體的安全用戶面定位服務器對話的應用程序，此連接能與default連接同時使用

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<span style="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} */</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">final</span> <span style="color: rgb(0, 102, 0); font-weight: bold;">int</span> TYPE_MOBILE_SUPL <span style="color: rgb(51, 153, 51);">=</span> <span style="color: rgb(204, 102, 204);">3</span><span style="color: rgb(51, 153, 51);">;</span> <span style="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} */</span> <span style="color:#000000;font-weight: bold;">public</span> <span style="color:#000000;font-weight: bold;">static</span> <span style="color:#000000;font-weight: bold;">final</span> <span style="color:#0660;font-weight: bold;">int</span> TYPE_MOBILE_SUPL <span style="color:#339933;">=</span> <span style="color:#cc66cc;">3</span><span style="color:#339933;">;</span>

適用場合:需要自動切換wap與net接入點的、需要把手機當臨時AP的
對SUPL技術感興趣的朋友，不妨看下以下文章
SUPL技術(一)http://blog.sina.com.cn/s/blog_537f4a11010008tw.html
SUPL技術(二)http://blog.sina.com.cn/s/blog_537f4a11010008uf.html
SUPL技術(三)http://blog.sina.com.cn/s/blog_537f4a11010008ws.html
SUPL技術(四)http://blog.sina.com.cn/s/blog_537f4a11010008yf.html
4、dun
Dial Up Networking撥號網絡的簡稱，此連接與default連接類似，用於執行一個撥號網絡網橋，使載體能知道撥號網絡流量的應用程序，此連接能與default連接同時使用

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<span style="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. */</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">final</span> <span style="color: rgb(0, 102, 0); font-weight: bold;">int</span> TYPE_MOBILE_DUN <span style="color: rgb(51, 153, 51);">=</span> <span style="color: rgb(204, 102, 204);">4</span><span style="color: rgb(51, 153, 51);">;</span> <span style="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. */</span> <span style="color:#000000;font-weight: bold;">public</span> <span style="color:#000000;font-weight: bold;">static</span> <span style="color:#000000;font-weight: bold;">final</span> <span style="color:#0660;font-weight: bold;">int</span> TYPE_MOBILE_DUN <span style="color:#339933;">=</span> <span style="color:#cc66cc;">4</span><span style="color:#339933;">;</span>

適用場合：需要使用運營商無線熱點的，CMCC、ChinaNet等
5、hipri
高優先級網絡，與default類似，但路由設置不同。
只有當進程訪問移動DNS服務器，並明確要求使用requestRouteToHost(int, int)纔會使用此連接
（這個我也不太懂，翻譯的應該很有問題….）

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<span style="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} */</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span style="color: rgb(0, 0, 0); font-weight: bold;">final</span> <span style="color: rgb(0, 102, 0); font-weight: bold;">int</span> TYPE_MOBILE_HIPRI <span style="color: rgb(51, 153, 51);">=</span> <span style="color: rgb(204, 102, 204);">5</span><span style="color: rgb(51, 153, 51);">;</span> <span style="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} */</span> <span style="color:#000000;font-weight: bold;">public</span> <span style="color:#000000;font-weight: bold;">static</span> <span style="color:#000000;font-weight: bold;">final</span> <span style="color:#0660;font-weight: bold;">int</span> TYPE_MOB