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" />