/**
 * 网络工具类
 */
public class NetworkUtil {
    public static String NETWORK_TYPE_WIFI = "WIFI";
    public static String NETWORK_TYPE_MOBILE = "MOBILE";
    public static String NETWORK_TYPE_ERROR = "ERROR";

    /**
     * 返回网络是否可用
     * @param context
     * @return 网络可用则返回true，否则返回false
     */
    public static boolean isAvailable(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = cm.getActiveNetworkInfo();
        return info != null && info.isAvailable();
    }

    /**
     * 判断网络连接状态
     * @param context
     */
    public static String getNetType(Context context) {

        try {
            ConnectivityManager connectivity = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            if (connectivity != null) {

                NetworkInfo info = connectivity.getActiveNetworkInfo();
                if (info != null && info.isConnected()) {

                    if (info.getState() == NetworkInfo.State.CONNECTED) {
                        if (info.getType() == ConnectivityManager.TYPE_WIFI) {
                            // wifi
                            return NETWORK_TYPE_WIFI;
                        } else {
                            // 手机网络
                            return NETWORK_TYPE_MOBILE;
                        }
                    }
                }
            }
        } catch (Exception e) {
            // 网络错误
            return NETWORK_TYPE_ERROR;
        }
        // 网络错误
        return NETWORK_TYPE_ERROR;

    }

    /**
     * 返回Wifi是否启用
     * @param context
     * @return Wifi网络可用则返回true，否则返回false
     */
    public static boolean isWIFIActivate(Context context) {
        return ((WifiManager) context.getSystemService(Context.WIFI_SERVICE))
                .isWifiEnabled();
    }

    /**
     * 修改Wifi状态
     * @param context
     * @param status
     *            true为开启Wifi，false为关闭Wifi
     */
    public static void changeWIFIStatus(Context context, boolean status) {
        ((WifiManager) context.getSystemService(Context.WIFI_SERVICE))
                .setWifiEnabled(status);
    }

    /**
     * 跳转到网络设置
     * @param context
     */

    public static void startNetSettingActivity(Context context){
        Intent intent = new Intent(
                Settings.ACTION_WIFI_SETTINGS);
        context.startActivity(intent);
    }
}