Network connection after background mode

[Gitju]

When the app runs in the background and is activated again after some minutes it can crash. After the crash the app can be started normally and it also shows a normal behaviour. The log:

10:45:24.984 [main] BlockchainServiceImpl - service start command: Intent { act=de.schildbach.wallet_mac.cancel_coins_received cmp=de.schildbach.wallet_mac/de.schildbach.wallet.service.BlockchainServiceImpl }
10:45:25.005 [ModernAsyncTask Litecoin-Java#11] ExchangeRatesProvider - problem fetching exchange rates
java.net.UnknownHostException: Unable to resolve host "ticker.machinecoin.de": No address associated with hostname
at java.net.InetAddress.lookupHostByName(InetAddress.java:439) ~[na:0.0]
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) ~[na:0.0]
at java.net.InetAddress.getAllByName(InetAddress.java:214) ~[na:0.0]
at libcore.net.http.HttpConnection.(HttpConnection.java:70) ~[na:0.0]
at libcore.net.http.HttpConnection.(HttpConnection.java:50) ~[na:0.0]
at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340) ~[na:0.0]
at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87) ~[na:0.0]
at libcore.net.http.HttpConnection.connect(HttpConnection.java:128) ~[na:0.0]
at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316) ~[na:0.0]
at libcore.net.http.HttpEngine.connect(HttpEngine.java:311) ~[na:0.0]
at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290) ~[na:0.0]
at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240) ~[na:0.0]
at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81) ~[na:0.0]
at de.schildbach.wallet.ExchangeRatesProvider.requestExchangeRates(ExchangeRatesProvider.java:267) ~[na:0.0]
at de.schildbach.wallet.ExchangeRatesProvider.query(ExchangeRatesProvider.java:144) ~[na:0.0]
at android.content.ContentProvider.query(ContentProvider.java:652) ~[na:0.0]
at android.content.ContentProvider$Transport.query(ContentProvider.java:189) ~[na:0.0]
at android.content.ContentResolver.query(ContentResolver.java:373) ~[na:0.0]
at android.content.ContentResolver.query(ContentResolver.java:316) ~[na:0.0]
at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:49) ~[na:0.0]
at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:35) ~[na:0.0]
at android.support.v4.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:240) ~[na:0.0]
at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:51) ~[na:0.0]
at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:40) ~[na:0.0]
at android.support.v4.content.ModernAsyncTask$2.call(ModernAsyncTask.java:123) ~[na:0.0]
at java.util.concurrent.FutureTask.run(FutureTask.java:234) ~[na:0.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) ~[na:0.0]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) ~[na:0.0]
at java.lang.Thread.run(Thread.java:838) ~[na:0.0]
Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
at libcore.io.Posix.getaddrinfo(Native Method) ~[na:0.0]
at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:59) ~[na:0.0]
at java.net.InetAddress.lookupHostByName(InetAddress.java:405) ~[na:0.0]
... 28 common frames omitted
Caused by: libcore.io.ErrnoException: getaddrinfo failed: ENETUNREACH (Network is unreachable)
... 31 common frames omitted
10:45:25.043 [main] BlockchainServiceImpl - network is down
10:45:39.253 [main] BlockchainServiceImpl - network is up
10:45:39.256 [main] BlockchainServiceImpl - starting peergroup

Especially "Unable to resolve host ticker.machinecoin.de" and "No address associated with hostname" is interesting. Looks like the app looses its internet connection in the background at a given point and therefore isn't able to get the address of the hostname.

Its no critical bug but annoying.
Will fix this soon.