Android 获取网络类型（WIFI、CMNET、CMWAP）

下面这个方法用于获取系统当前网络类型：

public static int getNetworkType(Context context) {
        ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

        if (connectivity != null) {
            // 获取网络连接管理的对象
            NetworkInfo info = connectivity.getActiveNetworkInfo();

            if (info != null && info.isConnected()) {
                // 判断当前网络是否已经连接
                if (info.getState() == NetworkInfo.State.CONNECTED) {
                    if (info.getTypeName().equals("WIFI")) {
                        return MrDefines.NETTYPE_WIFI;
                    } else {
                        Cursor mCursor = context.getContentResolver().query(Uri.parse("content://telephony/carriers"),
                                new String[] {"name"}, "current=1", null, null);

                        if(mCursor != null && mCursor.moveToFirst()){
                            String name = mCursor.getString(0);

                            if(name.equalsIgnoreCase("cmnet"))
                                return MrDefines.NETTYPE_CMNET;
                            else if(name.equalsIgnoreCase("cmwap"))
                                return MrDefines.NETTYPE_CMWAP;
                        }
                    }
                }
            }
        }

        return MrDefines.NETTYPE_UNKNOW;
    }

public static final int NETTYPE_WIFI=0,
        NETTYPE_CMWAP=1,
        NETTYPE_CMNET=2,
        NETTYPE_UNKNOW=3;