如何检查Android上的互联网访问？ InetAddress永远不会超时

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问题：

I got a AsyncTask that is supposed to check the network access to a host name. 我有一个AsyncTask应该检查网络访问主机名。 But the doInBackground() is never timed out. 但是doInBackground()永远不会超时。 Anyone have a clue? 有人有线索吗？

public class HostAvailabilityTask extends AsyncTask<String, Void, Boolean> {

private Main main;

public HostAvailabilityTask(Main main) {
this.main = main;
}

protected Boolean doInBackground(String... params) {
Main.Log("doInBackground() isHostAvailable():"+params[0]);

try {
return InetAddress.getByName(params[0]).isReachable(30);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}

protected void onPostExecute(Boolean... result) {
Main.Log("onPostExecute()");

if(result[0] == false) {
main.setContentView(R.layout.splash);
return;
}

main.continueAfterHostCheck();
}
}

解决方案：