StackOverflow2013

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plurals

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Id
10887031
data
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0
AnswerCount
0
ClosedDate
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1
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CreationDate
2012-06-04T19:21:37.783
FavoriteCount
0
LastActivityDate
2012-06-04T19:21:37.783
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LastEditorUserId
0
OwnerUserId
194894
ParentId
3070144
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
<p>I recommend <a href="http://www.xbill.org/dnsjava/" rel="nofollow">dnsjava</a> for complex DNS use on Android. Let's see how dnsjava determines the current active DNS server for the connection. <a href="http://dnsjava.svn.sourceforge.net/viewvc/dnsjava/trunk/org/xbill/DNS/ResolverConfig.java?revision=1665&view=markup" rel="nofollow">From dnsjava ResolverConfig.java:428</a>:</p> <pre><code>/** * Parses the output of getprop, which is the only way to get DNS * info on Android. getprop might disappear in future releases, so * this code comes with a use-by date. */ private void findAndroid() { // This originally looked for all lines containing .dns; but // http://code.google.com/p/android/issues/detail?id=2207#c73 // indicates that net.dns* should always be the active nameservers, so // we use those. String re1 = "^\\d+(\\.\\d+){3}$"; String re2 = "^[0-9a-f]+(:[0-9a-f]*)+:[0-9a-f]+$"; try { ArrayList lserver = new ArrayList(); ArrayList lsearch = new ArrayList(); String line; Process p = Runtime.getRuntime().exec("getprop"); InputStream in = p.getInputStream(); InputStreamReader isr = new InputStreamReader(in); BufferedReader br = new BufferedReader(isr); while ((line = br.readLine()) != null ) { StringTokenizer t = new StringTokenizer(line, ":"); String name = t.nextToken(); if (name.indexOf( "net.dns" ) > -1) { String v = t.nextToken(); v = v.replaceAll("[ \\[\\]]", ""); if ((v.matches(re1) || v.matches(re2)) && !lserver.contains(v)) lserver.add(v); } } configureFromLists(lserver, lsearch); } catch ( Exception e ) { // ignore resolutely } } </code></pre>
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1. POHow do you get the current DNS servers for Android?
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1. USFlow
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1. COWarning: this code can cause hungs in Runtime.getRuntime().exec()
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