blocks|key|1166823|text|答案非常简单:在Eclipse中删除，然后重新创建AVD+(虚拟设备/仿真器)。这对我来说很有效--第一次。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1166824|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The answer is devilishly simple: remove, then re-create your AVD (virtual device/emulator) in Eclipse. It worked for me--first time.

blocks|key|1166940|text|我也在手机上看到过(在做USB调试的时候)。解决方案是禁用WiFi，然后重新启用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1166941|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I have seen this on a phone as well (while doing USB debugging). The solution was to disable WiFi, and re-enable it.

blocks|key|952814|text|太感谢你了，拉斯。我很高兴你坚持下来了。我花了大半个小时的时间阅读了这个错误的各种可能的修复。对于遇到这个话题的其他人，我将在这里简要回顾一下：-Check互联网使用权限包含在清单中，包括您的操作系统-Share连接(仅限windows)上的例外(无意义)+-Changing防火墙设置和大量其他内容|type|unstyled|depth|inlineStyleRanges|entityRanges|data|952815|我的解决方案比你的要多一点，但不会太多。在读完你的帖子后，我关闭并销毁了所有的模拟器。然后我注意到，当我用鼠标滑过run按钮(带白色箭头的绿色圆圈)时，它显示程序已经在运行，即使不存在AVDs+(仿真器)！总之，重启了eclipse，创建了一个AVD并运行它，Bob是我父亲的兄弟。与我的代码或设置没有任何关系。|952816|后来我发现了这个。它可能会实现同样的效果，但我不能保证，除非问题再次发生。http://www.jiahaoliuliu.com/2011/02/stopping-android-applications-already.html另一个/可能/实现相同结果的技巧是在Run+Configurations的Target选项卡中勾选“擦除用户数据”。|offset|length|952817|entityMap|0|LINK|mutability|MUTABLE|url|http://www.jiahaoliuliu.com/2011/02/stopping-android-applications-already.html^0|0|0|11|26|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Thank you so much Russ. I'm glad you persisted. I had spent the best part of an hour reading all kinds of possible fixes to this error. Just for anyone else stumbling across this thread, i'll briefly recap here:
-Check Internet uses permission is in the manifest
-Catching the exception (pointless)
-Changing firewall settings on your OS
-Share connection (windows only)
And a load of other stuff

My fix took a little more than yours, but not much.
After reading your post, I closed and destroyed all emulators. Then I noticed that when I moused over the run button (green circle with white arrow) it said the program was already running, even though no AVDs (emulators) existed! Anyway, restarted eclipse, created a AVD and ran it and Bob was my father's brother. Nothing to do with my code or setup at all.

I found this afterwards. It may well achieve the same thing but I can't vouch for it unless the problem reoccurs.
<a href="http://www.jiahaoliuliu.com/2011/02/stopping-android-applications-already.html" rel="nofollow">http://www.jiahaoliuliu.com/2011/02/stopping-android-applications-already.html</a>
Another trick that /may/ achieve the same result is tick "wipe user data" in Run Configurations, Target tab.

blocks|key|1167162|text|我无法摆脱仿真器"UnknownHostExceptions“-仿真器的浏览器也无法连接。我尝试了所有我能在堆栈溢出和其他地方找到的建议。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167163|最后，我删除了我的AVD，关闭了Eclipse，然后通过命令行创建了AVD。然后使用-dns-server+8.8.8.8通过命令行启动它。(在我的Mac上：./模拟器服务器Google-8+-dns-+-avd+8.8.8.8)它终于成功了！|1167164|希望这对其他人有帮助。|1167165|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I couldn't get rid of the emulator "UnknownHostExceptions" - and the emulator's browser wouldn't get a connection either. Tried all suggestions I could find at stack overflow and everywhere else. 

Finally I deleted my AVD, shut down Eclipse, and then created the AVD via the command line. Then launched it via command line with the -dns-server 8.8.8.8. (on my Mac: ./emulator -avd Google-8 -dns-server 8.8.8.8) It finally worked!

Hope this helps someone else.

blocks|key|953034|text|我的问题是，当通过WIFI从电脑共享互联网时，在以太网连接断开并重新连接后，我无法在电话上实现连接。已通过重新启动计算机上的互联网共享修复此问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|953035|希望这能帮助到别人。|953036|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

My problem was when sharing the internet from the computer via WIFI, after ethernet connection was lost and reconnected I couldn't achieve connection on the phone. This was fixed by restarting internet sharing on computer.

Hope it helps someone.

blocks|key|1167312|text|在我的例子中，我使用了基于主机名的URL和HttpURLConnection。然而，使用基于IP的url解决了这个问题。我还删除/重新创建了AVD，但这并没有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167313|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case I was using host name based URL with HttpURLConnection. However, using an IP based url, resolved the issue. I also deleted/recreated the AVD but that didn't help.

blocks|key|1167388|text|在我的例子中，我从手机上的URL下载了一个XML文件，但在这个帖子中描述了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167389|为了修复它，我不仅需要有正常的互联网许可|1167390|<uses-permission+android:name="android.permission.INTERNET"+/>+|code-block|syntax|javascript|1167391|但我也需要|1167392|<uses-permission+android:name="android.permission.WRITE_EXTERNAL_STORAGE"+/>|1167393|作为一个建议，看看你的设备是否需要同样的东西，尝试导航到手机浏览器中的URL，看看是否提示需要SD卡或其他东西。|1167394|希望这能帮助到其他人。|1167395|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

In my case I was downloading an XML file from a URL on my phone but was having the issue describe in this thread. 

for fixing it, I not only needed to have the regular internet permission

<pre><code>&lt;uses-permission android:name="android.permission.INTERNET" /&gt; 
</code></pre>

But I also needed

<pre><code>&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
</code></pre>

As a suggestion to see if your device may need the same thing, try navigating to the URL in your phone's browser to see if prompts about needing SD Card or something.

Hope that helps others.

blocks|key|1167410|text|我只需重新启动AVD并添加用户权限，然后它就可以工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167411|<uses-permission+android:name="android.permission.INTERNET"+/>|offset|length|style|CODE|1167412|entityMap^0|0|0|1Q|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I just restart the AVD and add the User Permission then it works.

<code>&lt;uses-permission android:name="android.permission.INTERNET" /&gt;
</code>

blocks|key|1167447|text|我是通过在AndroidMenifest.xml文件中添加用户访问互联网权限来工作的|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1167448|<uses-permission+android:name="android.permission.INTERNET"/>|code-block|syntax|javascript|1167449|entityMap^0|5|J|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

It work's for me by adding user's permission for Internet in <code>AndroidMenifest.xml</code> file

<pre><code>&lt;uses-permission android:name="android.permission.INTERNET"/&gt;
</code></pre>

blocks|key|1167483|text|问题已解决|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167484|运行cd+C:\Program+Files\Android\android-sdk\tools|1167485|在cmd中运行android+list+avd返回您可用的列表avd...在我的例子中，它是Myabc_avd|1167486|运行模拟器avd+-dns-server8.8.8.8在cmd+...avd将显示avd，转到avd的浏览器，输入www.google.com将显示谷歌页面。您现在可以使用像myfrstapp.com这样的主机名访问浏览器|1167487|如果一切顺利，那么您可以使用eclipse运行您的项目，但要确保它是在从cmd运行的avd中运行的。|1167488|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

issue resolved 

run cd C:\Program Files\Android\android-sdk\tools

run android list avd in cmd returns list of ur availabe avd.... in my case its Myabc_avd

run emulator @Myabc_avd -dns-server 8.8.8.8 in cmd ...avd will show avd 
go to avd's browser and type www.google.com will show google page.
u can now access browser using hostname like myfrstapp.com

if all go well then u can run ur project using eclipse but make sure it is running in avd which is running from cmd.

blocks|key|1167504|text|在我的例子中，我刚刚重新启动了Emulator，它起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167505|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case i have just restarted the Emulator and it worked.

blocks|key|1167519|text|请尝试重新启动模拟器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167520|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Please try rebooting the emulator.

This code doesn't work:

<pre><code>URL url = new URL( xmlPath );
InputSource input = new InputSource( url.openStream() );
</code></pre>

all the time, resulting in an UnknownHostException, even when the host exists, has been hit successfully using the same code if from a different development host (machine), and also from a browser.

I'm probably out of line asking this question again, a repeat of <a href="https://stackoverflow.com/questions/3293659/android-java-net-unknownhostexception-host-is-unresolved-strategy-question">Android java.net.UnknownHostException: Host is unresolved (strategy question)</a>. The forum software would not allow me to comment on the unsatisfactory answer to that question (in order to solicit more attention to the solution I ultimately found). Perhaps I'm not popular enough yet to be given that privilege. In the meantime, I'm essentially re-posting the question and a different answer.

Basically, I accept that maybe the Android device has a hard time with DNS under certain circumstances, but I've tried, for example the anddev.org example of how to use the SAX parser, and it worked on one machine I have and not on another.

Edit:
As noted, I know a working answer and will post it.

I am a) asking a question (that's already been asked and unsuccessfully answered) and b) answering it for the benefit of those for whom my answer will be useful.

Android java.net.UnknownHostException: Host is unresolved

服务器

防火墙

Android

Eclipse

下面的代码不起作用：URL         url   = new URL( xmlPath );InputSource input = new InputSource( url.openStream() );在任何时候，即使在主机存在的情况下，如果从不同的开发主机(机器)和浏览器使用相同的代码，都会成功命中Unkno...

问安卓java.net.UnknownHostException:主机未解析
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