blocks|key|2933389|text|通过谷歌搜索3G网络的工作原理，我发现出站连接和入站连接都涉及到NATing+(NAT穿越)。当通过WiFi连接时，这不是必需的。因此，在android%2BNAT%2B3G%2Bsockets上搜索一下，我就得到了这个问题的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2933390|Android+Client,+Pc+Server+Socket+d'ont+work+over+3g|offset|length|2933391|https://stackoverflow.com/questions/917385/nat-traversal-with-java|2933392|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/6748435/android-client-pc-server-socket-dont-work-over-3g|1^0|0|0|1F|0|0|0|1U|1|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@$D|S|E|T|1|U]]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|H|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|G]]]]

Googling about how 3G networks work I found that there is NATing (NAT Traversal) involved with outbound and inbound connections. This is not required when connecting via WiFi. So then doing some search on android+NAT+3G+sockets resulted in my answer to this question.

<a href="https://stackoverflow.com/questions/6748435/android-client-pc-server-socket-dont-work-over-3g">Android Client, Pc Server Socket d&#39;ont work over 3g</a>

<a href="https://stackoverflow.com/questions/917385/nat-traversal-with-java">https://stackoverflow.com/questions/917385/nat-traversal-with-java</a>

blocks|key|2845882|text|这里：http://developer.android.com/reference/android/net/ConnectivityManager.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2845883|和：Google+Android+-+how+to+figure+out+if+3g+and+2g+is+turned+on|2845884|和：How+to+use+3G+Connection+in+Android+Application+instead+of+Wi-fi?|2845885|和：ConnectivityManager+getActiveNetworkInfo()+is+always+null+even+with+data+traffic+active|2845886|和：http://www.chrisdadswell.co.uk/android-coding-example-checking-for-the-presence-of-an-internet-connection-on-an-android-device/|2845887|和：http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.2_r1.1/android/net/ConnectivityManager.java#376|2845888|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/net/ConnectivityManager.html|1|https://stackoverflow.com/questions/763972/google-android-how-to-figure-out-if-3g-and-2g-is-turned-on|2|https://stackoverflow.com/questions/2513713/how-to-use-3g-connection-in-android-application-instead-of-wi-fi|3|https://stackoverflow.com/questions/6098639/connectivitymanager-getactivenetworkinfo-is-always-null-even-with-data-traffic|4|http://www.chrisdadswell.co.uk/android-coding-example-checking-for-the-presence-of-an-internet-connection-on-an-android-device/|5|http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.2_r1.1/android/net/ConnectivityManager.java#376^0|3|23|0|0|2|1O|1|0|2|1T|2|0|2|2F|3|0|2|3J|4|0|2|3Q|5|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|D|3|E|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|F|3|G|5|6|7|1D|8|@]|9|@$A|1E|B|1F|1|1G]]|C|$]]|$1|H|3|I|5|6|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]]|C|$]]|$1|J|3|K|5|6|7|1L|8|@]|9|@$A|1M|B|1N|1|1O]]|C|$]]|$1|L|3|M|5|6|7|1P|8|@]|9|@$A|1Q|B|1R|1|1S]]|C|$]]|$1|N|3|-4|5|6|7|1T|8|@]|9|@]|C|$]]]|O|$P|$5|Q|R|S|C|$T|U]]|V|$5|Q|R|S|C|$T|W]]|X|$5|Q|R|S|C|$T|Y]]|Z|$5|Q|R|S|C|$T|10]]|11|$5|Q|R|S|C|$T|12]]|13|$5|Q|R|S|C|$T|14]]]]

Here : <a href="http://developer.android.com/reference/android/net/ConnectivityManager.html" rel="nofollow noreferrer">http://developer.android.com/reference/android/net/ConnectivityManager.html</a>

and : <a href="https://stackoverflow.com/questions/763972/google-android-how-to-figure-out-if-3g-and-2g-is-turned-on">Google Android - how to figure out if 3g and 2g is turned on</a>

and : <a href="https://stackoverflow.com/questions/2513713/how-to-use-3g-connection-in-android-application-instead-of-wi-fi">How to use 3G Connection in Android Application instead of Wi-fi?</a>

and : <a href="https://stackoverflow.com/questions/6098639/connectivitymanager-getactivenetworkinfo-is-always-null-even-with-data-traffic">ConnectivityManager getActiveNetworkInfo() is always null even with data traffic active</a>

and : <a href="http://www.chrisdadswell.co.uk/android-coding-example-checking-for-the-presence-of-an-internet-connection-on-an-android-device/" rel="nofollow noreferrer">http://www.chrisdadswell.co.uk/android-coding-example-checking-for-the-presence-of-an-internet-connection-on-an-android-device/</a>

and : <a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.2_r1.1/android/net/ConnectivityManager.java#376" rel="nofollow noreferrer">http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.2_r1.1/android/net/ConnectivityManager.java#376</a>

blocks|key|2933424|text|我使用谷歌游戏服务来实现这一点，iOS+/安卓跨平台也是如此。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2933425|您可以根据需要使用实时API或基于turn的API。https://developers.google.com/games/services/common/concepts/realtimeMultiplayer|offset|length|2933426|entityMap|0|LINK|mutability|MUTABLE|url|https://developers.google.com/games/services/common/concepts/realtimeMultiplayer^0|0|Q|28|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I have used Google Play Games Services to achieve that, iOS / Android crossplatform also.

You can use real-time or turn-based API depending on your needs.
<a href="https://developers.google.com/games/services/common/concepts/realtimeMultiplayer" rel="nofollow noreferrer">https://developers.google.com/games/services/common/concepts/realtimeMultiplayer</a>

I am creating a mobile application on Android that requires devices to communicate with each other over very large distances. When a phone is connected on the internet via WiFi I have the convenience of an IP-Address. But if its connected via 3G I have nothing but the phone number, I can communicate via SMS but I want to use something better like the 3G connection.

So the question goes as how would an android device connect directly to another device through the 3G network if WiFi is not available?

Note: I have thought of a server that acts as a proxy that maps phone numbers to IP address, but if I can establish a direct channel just using the phone number as the ID over 3G.

Thanks in advance to anyone who can provide any information.

How to connect to a mobile phone via 3G using Android

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在Android上创建一个移动应用程序，它需要设备之间进行非常远距离的通信。当电话通过WiFi连接到互联网时，我可以方便地使用IP地址。但如果它是通过3G连接的，我除了电话号码什么都没有，我可以通过短信进行交流，但我想使用更好的东西，比如3G连接。因此问题来了，如果WiFi不可用，安卓设备如何通过3G网络直接连接到另一台设备？注意:我已经想到了一个服务器，它充当代理，将电话号码映射到IP地址，

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