Android中判断网络连接状态的方法

// check all network connect, WIFI or mobile
public static boolean isNetworkAvailable(final Context context) {
  boolean hasWifoCon = false;
  boolean hasMobileCon = false;
 
  ConnectivityManager cm = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
  NetworkInfo[] netInfos = cm.getAllNetworkInfo();
  for (NetworkInfo net : netInfos) {
 
    String type = net.getTypeName();
    if (type.equalsIgnoreCase("WIFI")) {
      LevelLogUtils.getInstance().i(tag, "get Wifi connection");
      if (net.isConnected()) {
        hasWifoCon = true;
      }
    }
 
    if (type.equalsIgnoreCase("MOBILE")) {
      LevelLogUtils.getInstance().i(tag, "get Mobile connection");
      if (net.isConnected()) {
        hasMobileCon = true;
      }
    }
  }
  return hasWifoCon || hasMobileCon;
 
}

// network available cannot ensure Internet is available
public static boolean isNetWorkAvailable(final Context context) {
  Runtime runtime = Runtime.getRuntime();
  try {
    Process pingProcess = runtime.exec("/system/bin/ping -c 1 www.baidu.com");
    int exitCode = pingProcess.waitFor();
    return (exitCode == 0);
  } catch (Exception e) {
    e.printStackTrace();
  }
  return false;
}

URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
  return new Boolean(true);
}