Android编程判断是否连接网络的方法【WiFi及3G判断】

public static boolean isWiFiActive(Context inContext) {
     WifiManager mWifiManager = (WifiManager) inContext
     .getSystemService(Context.WIFI_SERVICE);
     WifiInfo wifiInfo = mWifiManager.getConnectionInfo();
     int ipAddress = wifiInfo == null ? 0 : wifiInfo.getIpAddress();
     if (mWifiManager.isWifiEnabled() && ipAddress != 0) {
     System.out.println("**** WIFI is on");
       return true;
     } else {
       System.out.println("**** WIFI is off");
       return false;
     }
}

public static boolean isNetworkAvailable( Context context) {
  ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivity == null) {
      System.out.println("**** newwork is off");
      return false;
    } else {
      NetworkInfo info = connectivity.getActiveNetworkInfo();
      if(info == null){
        System.out.println("**** newwork is off");
        return false;
      }else{
        if(info.isAvailable()){
          System.out.println("**** newwork is on");
          return true;
        }
      }
    }
     System.out.println("**** newwork is off");
  return false;
}

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />