获取网络信息，ip,子网掩码，网关，dns

无线网络信息可以通过api直接获取，无需特别处理，下面主要是机顶盒等android设备使用有线网络时网络信息的获取。

1.网络类型

    /**     * 获取网络类型     * @return     *      -1：未知网络     *       0：无网络     *       1：wifi网络     *       2：移动网络     *       3：以太网     */    public static int getNetWorkInfo() {        ConnectivityManager connectivityManager = (ConnectivityManager) MyApplication.getContext().getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo info = connectivityManager.getActiveNetworkInfo();        if (info != null && info.isAvailable()) {            if (info.getType() == ConnectivityManager.TYPE_WIFI) {                return 1;            }            if (info.getType() == ConnectivityManager.TYPE_MOBILE) {                return 2;            }            if (info.getType() == ConnectivityManager.TYPE_ETHERNET) {                return 3;            }        } else {            return 0;        }        return -1;    }

2.获取详细网络信息

static final String etName = "eth0";    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    private static NetWorkInfo getETnetwork(NetWorkInfo netWorkInfo) {        EthernetManager mEthernetManager = (EthernetManager) MyApplication.getContext().getSystemService("ethernet");        IpConfiguration configuration = mEthernetManager.getConfiguration();        if (configuration == null) {            return netWorkInfo;        }        IpConfiguration.IpAssignment ipAssignment = configuration.getIpAssignment();        if (ipAssignment == null) {            return netWorkInfo;        }        String ip = "";        String mask = "";        String gateway = "";        String dns1 = "";        String dns2 = "";        if (IpConfiguration.IpAssignment.DHCP == ipAssignment) {//DHCP自动分配方式            Log.i(TAG, "DHCP");            ip = getSystemOsString("dhcp." + etName + ".ipaddress");//ip            mask = getSystemOsString("dhcp." + etName + ".mask");            gateway = getSystemOsString("dhcp." + etName + ".gateway");            dns1 = getSystemOsString("dhcp." + etName + ".dns1");            dns2 = getSystemOsString("dhcp." + etName + ".dns2");        } else if (IpConfiguration.IpAssignment.STATIC == ipAssignment) {//手动设置方式            Log.i(TAG, "STATIC");            ip = configuration.getStaticIpConfiguration().ipAddress.getAddress().getHostAddress();            mask = getMask(configuration.getStaticIpConfiguration().ipAddress.getPrefixLength());            gateway = configuration.getStaticIpConfiguration().gateway.getHostAddress();            dns1 = configuration.getStaticIpConfiguration().dnsServers.get(0).getHostAddress();            dns2 = configuration.getStaticIpConfiguration().dnsServers.get(1).getHostAddress();        }        netWorkInfo.mask = mask;//子网掩码        netWorkInfo.gateway = gateway;//网关        netWorkInfo.dns1 = dns1;//dns1        netWorkInfo.dns2 = dns2;//dns2        return netWorkInfo;    }    /**     * 计算子网掩码     */    private static String getMask(int prefix) {        StringBuilder stb = new StringBuilder();        StringBuilder result = new StringBuilder();        for (int i = 1; i <= 32; i++) {            stb.append(i <= prefix ? "1" : "0");            if (i % 8 == 0) {                result.append(Integer.parseInt(stb.toString(), 2)).append(".");                stb.setLength(0);            }        }        return result.deleteCharAt(result.length() - 1).toString();    }    private static String getSystemOsString(String property) {        Class clazz = null;        try {            clazz = Class.forName("android.os.SystemProperties");        } catch (ClassNotFoundException e) {            e.printStackTrace();            return unknown;        }        Method met;        try {            met = clazz.getMethod("get", String.class, String.class);            met.setAccessible(true);        } catch (NoSuchMethodException e) {            e.printStackTrace();            return unknown;        }        Object obj = null;        try {            obj = met.invoke(null, new Object[]{property, "unknown"});        } catch (IllegalArgumentException e) {            e.printStackTrace();            return unknown;        } catch (IllegalAccessException e) {            e.printStackTrace();            return unknown;        } catch (InvocationTargetException e) {            e.printStackTrace();            return unknown;        }        return (String) obj;    }

关于子网掩码的计算：
prefixLength最大32位，可以分成4组8个1的二进制，正好是255，255，255，255，少N位就要在末尾去掉N个1加上N个0，然后再把4组二进制数据换成十进制就得出最终结果；
例如：
30 = 255，255，255，252
26 = 255，255，255，192
最后，EthernetManager这个类是被隐藏的，可以自己把这一部分的android源码加到自己的项目里去调用，也可以用我上传的jar包直接用。
android.net.jar

1.网络类型

2.获取详细网络信息

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