Android 判断网络是否可用以及网络类型（WIFI,2G,3G,4G）

Android中通过系统方法判断网络状态以及网络类型

public class NetState {    /**     * Unknown network class     */    public static final int NETWORK_CLASS_UNKNOWN = 0;    /**     * wifi net work     */    public static final int NETWORK_WIFI = 1;    /**     * "2G" networks     */    public static final int NETWORK_CLASS_2_G = 2;    /**     * "3G" networks     */    public static final int NETWORK_CLASS_3_G = 3;    /**     * "4G" networks     */    public static final int NETWORK_CLASS_4_G = 4;    /**     * @return 是否有活动的网络连接     */    public static boolean hasNetWorkConnection(Context context) {        //获取连接活动管理器        final ConnectivityManager connectivityManager = (ConnectivityManager) context.                getSystemService(Context.CONNECTIVITY_SERVICE);        //获取链接网络信息        final NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();        return (networkInfo != null && networkInfo.isAvailable());    }    public static int getNetWorkClass(Context context) {        TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);        switch (telephonyManager.getNetworkType()) {            case TelephonyManager.NETWORK_TYPE_GPRS:            case TelephonyManager.NETWORK_TYPE_EDGE:            case TelephonyManager.NETWORK_TYPE_CDMA:            case TelephonyManager.NETWORK_TYPE_1xRTT:            case TelephonyManager.NETWORK_TYPE_IDEN:                return NETWORK_CLASS_2_G;            case TelephonyManager.NETWORK_TYPE_UMTS:            case TelephonyManager.NETWORK_TYPE_EVDO_0:            case TelephonyManager.NETWORK_TYPE_EVDO_A:            case TelephonyManager.NETWORK_TYPE_HSDPA:            case TelephonyManager.NETWORK_TYPE_HSUPA:            case TelephonyManager.NETWORK_TYPE_HSPA:            case TelephonyManager.NETWORK_TYPE_EVDO_B:            case TelephonyManager.NETWORK_TYPE_EHRPD:            case TelephonyManager.NETWORK_TYPE_HSPAP:                return NETWORK_CLASS_3_G;            case TelephonyManager.NETWORK_TYPE_LTE:                return NETWORK_CLASS_4_G;            default:                return NETWORK_CLASS_UNKNOWN;        }    }    public static int getNetWorkStatus(Context context) {        int netWorkType = NETWORK_CLASS_UNKNOWN;        ConnectivityManager connectivityManager = (ConnectivityManager) context                .getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();        if (networkInfo != null && networkInfo.isConnected()) {            int type = networkInfo.getType();            if (type == ConnectivityManager.TYPE_WIFI) {                netWorkType = NETWORK_WIFI;            } else if (type == ConnectivityManager.TYPE_MOBILE) {                netWorkType = getNetWorkClass(context);            }        }        return netWorkType;    }}

使用上面的方法可以检测大部分情况下的网络变化，但是在做硬件开发的时候会遇到这种情况，就是Android平板在插上网线之后，网线另一端连通的是路由器。路由器并没有网络，但是路由器到Android平板那一段是连通的，会导致网络判断为有网络。
所以在这种情况下就需要使用特殊的情况去判断网络到底是否连通，比如可以ping服务器来判断网络连接情况。或者检测自己的长连接来做判断。

public static final boolean ping() {        String result = null;        try {            // ping 的地址，可以换成任何一种可靠的外网             String ip = "www.baidu.com";            // ping网址3次             Process p = Runtime.getRuntime().exec("ping -c 3 -w 100 " + ip);            // 读取ping的内容，可以不加             InputStream input = p.getInputStream();            BufferedReader in = new BufferedReader(new InputStreamReader(input));            StringBuffer stringBuffer = new StringBuffer();            String content = "";            while ((content = in.readLine()) != null) {                stringBuffer.append(content);            }            Log.d("------ping-----", "result content : " + stringBuffer.toString());            // ping的状态             int status = p.waitFor();            if (status == 0) {                result = "success";                return true;            } else {                result = "failed";            }        } catch (IOException e) {            result = "IOException";        } catch (InterruptedException e) {            result = "InterruptedException";        } finally {            Log.d("----result---", "result = " + result);        }        return false;    }

最后附上一个简易的轮询方法检测网络状态

    /**     * 定时轮询柜门状态     */    public void executeCheckNetwork() {        executorCheckNetwork = Executors.newScheduledThreadPool(1);        executorCheckNetwork.scheduleWithFixedDelay(                new CheckNetworkServer(),                0,                1,                TimeUnit.SECONDS);    }  /**     * 轮询网络状态     */    class CheckNetworkServer implements Runnable {        @Override        public void run() {            final boolean isConnect = NetState.hasNetWorkConnection(instance);            final int networkStatus = NetState.getNetWorkStatus(instance);            runOnUiThread(new Runnable() {                @Override                public void run() {                    //判断网络状态                    if (!isConnect) {                        ivWlan.setImageDrawable(getResources().getDrawable(R.mipmap.icon_wifi_network_unline));                        return;                    }                    switch (networkStatus) {                        case NetState.NETWORK_WIFI:                            ivWlan.setImageDrawable(getResources().getDrawable(R.mipmap.icon_network_wifi));                            break;                        case NetState.NETWORK_CLASS_2_G:                            ivWlan.setImageDrawable(getResources().getDrawable(R.mipmap.icon_network_2g));                            break;                        case NetState.NETWORK_CLASS_3_G:                            ivWlan.setImageDrawable(getResources().getDrawable(R.mipmap.icon_network_3g));                            break;                        case NetState.NETWORK_CLASS_4_G:                            ivWlan.setImageDrawable(getResources().getDrawable(R.mipmap.icon_network_4g));                            break;                        default:                            ivWlan.setImageDrawable(getResources().getDrawable(R.mipmap.icon_network_wlan));                            break;                    }                }            });        }    }

Android中通过系统方法判断网络状态以及网络类型

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