Android, UnknownHostException: www.google.com, on device,not emulator

I'm using google api java client for connecting to Google Docs in Android app. Once in a while i get following exception:

UnknownHostException: www.google.com

Code:

transport = AndroidHttp.newCompatibleTransport();
ClientLogin authenticator = new ClientLogin();
authenticator.authTokenType = "writely";
authenticator.username = username.getText().toString();
authenticator.password = password.getText().toString();
authenticator.transport = transport;
authenticator.authenticate().getAuthorizationHeaderValue();

Device reset clears exception but is it necessary. I suspected for DNS caching and tried following but didnt work. Im not behind a proxy as far I know.

Security.setProperty("networkaddress.cache.ttl","0");
System.setProperty("networkaddress.cache.ttl","0");
System.setProperty("networkaddress.cache.negative.ttl","0");
System.setProperty("net.eth0.dns1","8.8.8.8");
System.setProperty("net.dns1","8.8.8.8");

Last time it occurred was this morning when one network connection "died", cell auto got second one, tried to do ClientLogin but 开发者_开发问答failed with exception.

Just to make it clear, Im talking about DEVICE (htc desire hd), not emulator.

Thanks in advance.

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add this line to your AndroidManifest.xml file, just after the <manifest> tag and before the <application> tag:

<uses-permission android:name="android.permission.INTERNET" />

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I run into this daily. I think it is a bug in the emulator. After reset of emulator it works again and it never happened on a real device.

Edit: most definitely a bug in the emulator. See this thread. There are also several posts on StackOverflow regarding those emulator connection issues.