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Get DNS server for older Android versions

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M66B
2019-07-15 16:53:47 +02:00
parent 4a5235b4bf
commit 6499a14c7b
1 changed files with 21 additions and 6 deletions
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27
app/src/main/java/eu/faircode/email/ConnectionHelper.java
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@@ -275,17 +275,32 @@ public class ConnectionHelper {
}
static String getDnsServer(Context context) {
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M)
return DEFAULT_DNS;
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cm == null)
return DEFAULT_DNS;
Network active = cm.getActiveNetwork();
if (active == null)
return DEFAULT_DNS;
LinkProperties props = cm.getLinkProperties(active);
LinkProperties props = null;
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
for (Network network : cm.getAllNetworks()) {
NetworkInfo ni = cm.getNetworkInfo(network);
if (ni != null && ni.isConnected()) {
props = cm.getLinkProperties(network);
Log.i("Old props=" + props);
break;
}
}
else {
Network active = cm.getActiveNetwork();
if (active == null)
return DEFAULT_DNS;
props = cm.getLinkProperties(active);
Log.i("New props=" + props);
}
if (props == null)
return DEFAULT_DNS;
List<InetAddress> dns = props.getDnsServers();
if (dns.size() == 0)
return DEFAULT_DNS;