Android判断网络连接状态，判断网络连接方式，获取IP地址

一、判断网络连接状态

    /**
     * 检测网络是否连接
     *
     * @return
     */
    public static boolean checkNetworkState(Context context) {
        boolean flag = false;
        //得到网络连接信息
        ConnectivityManager manager = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //去进行判断网络是否连接
        if (manager.getActiveNetworkInfo() != null) {
            flag = manager.getActiveNetworkInfo().isAvailable();
        }
        return flag;
    }

二、判断网络连接方式

    /**
     * 网络已经连接，然后去判断是wifi连接还是GPRS连接,还是其他连接
     * 设置一些自己的逻辑调用
     */
    public static boolean isNetworkAvailable(Context context) {

        ConnectivityManager manager = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo.State gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
        NetworkInfo.State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
        if (gprs == NetworkInfo.State.CONNECTED || gprs == NetworkInfo.State.CONNECTING) {
            //判断为GPRS手机网络状态
            return gprs;
        } else if (wifi == NetworkInfo.State.CONNECTED || wifi == NetworkInfo.State.CONNECTING) {
            //判断为wifi状态
           return true;
        } else {  //其他
            return true;
        }
    }

三、获取IP地址

    /**
     * 获取IP地址
     *
     * @return String IP地址
     */
    public static String getIpAddressString() {
        try {
            for (Enumeration enNetI = NetworkInterface
                    .getNetworkInterfaces(); enNetI.hasMoreElements(); ) {
                NetworkInterface netI = enNetI.nextElement();
                for (Enumeration enumIpAddr = netI
                        .getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                    InetAddress inetAddress = enumIpAddr.nextElement();
                    if (inetAddress instanceof Inet4Address && !inetAddress.isLoopbackAddress()) {
                        return inetAddress.getHostAddress();
                    }
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return "";
    }