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在Android系統中進行網絡開發時，如果使用了java.nio等相關包後有可能碰到異常java.net.SocketException: Bad address family。原因是Android2.2bug不能啟用IPV6協議，具體可點擊這裏。
異常資訊：

java.net.SocketException: Bad address family
at org.apache.harmony.luni.platform.OSNetworkSystem.connectStreamWithTimeoutSocketImpl(Native Method)
at org.apache.harmony.luni.platform.OSNetworkSystem.connect(OSNetworkSystem.java:115)
at org.apache.harmony.nio.internal.SocketChannelImpl.connect(SocketChannelImpl.java:272)
at org.apache.harmony.nio.internal.PipeImpl$SinkChannelImpl.finishConnect(PipeImpl.java:164)
at org.apache.harmony.nio.internal.PipeImpl.<init>(PipeImpl.java:48)
at org.apache.harmony.nio.internal.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:51)
at org.apache.harmony.nio.internal.SelectorImpl.</init><init>(SelectorImpl.java:141)
at org.apache.harmony.nio.internal.SelectorProviderImpl.openSelector(SelectorProviderImpl.java:58)</init>

解決代碼：
static {
java.lang.System.setProperty("java.net.preferIPv4Stack", "true");
java.lang.System.setProperty("java.net.preferIPv6Addresses", "false");
}
轉載: HTTP://orgcent.com/android-bad-address-family-exception/ | 蘿蔔白菜的博客