Android 判断网络类型(WIFI、MOBILE、NONE)

public class NetworkUtil {    public static final int TYPE_NONE = -1;    public static final int TYPE_MOBILE = 0;    public static final int TYPE_WIFI = 1;    private NetworkUtil() {}    /**     * 获取网络状态     *     * @param context     * @return one of TYPE_NONE, TYPE_MOBILE, TYPE_WIFI     * @permission android.permission.ACCESS_NETWORK_STATE     */    public static final int getNetWorkStates(Context context) {        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();        if (activeNetworkInfo == null || !activeNetworkInfo.isConnected()) {            return TYPE_NONE;//没网        }        int type = activeNetworkInfo.getType();        switch (type) {            case ConnectivityManager.TYPE_MOBILE:                return TYPE_MOBILE;//移动数据            case ConnectivityManager.TYPE_WIFI:                return TYPE_WIFI;//WIFI            default:                break;        }        return TYPE_NONE;    }}