判断是否连接网络以及是否是局域网

有时候我们连接上一个没有外网连接的WiFi或者需要输入账号和密码才能链接外网的网络，就会出现虽然网络可用，但是外网却不可以访问。针对这种情况，一般的解决办法就是ping一个外网，如果能ping通就说明可以真正上网，代码如下

* @author sichard

* @category 判断是否有外网连接（普通方法不能判断外网的网络是否连接，比如连接上局域网）

* @return

*/

public static final boolean ping() {

String result = null; 

try { 

String ip = "www.baidu.com";// ping 的地址，可以换成任何一种可靠的外网 

Process p = Runtime.getRuntime().exec("ping -c 3 -w 100 " + ip);// ping网址3次 

// 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;

public static String GetNetworkType()

{

String strNetworkType = "";

NetworkInfo networkInfo = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE).getActiveNetworkInfo();

if (networkInfo != null && networkInfo.isConnected())

{

if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI)

{

strNetworkType = "WIFI";

}

else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE)

{

String _strSubTypeName = networkInfo.getSubtypeName();

Log.e("cocos2d-x", "Network getSubtypeName : " + _strSubTypeName);

// TD-SCDMA   networkType is 17

int networkType = networkInfo.getSubtype();

switch (networkType) {

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: //api<8 : replace by 11

strNetworkType = "2G";

break;

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: //api<9 : replace by 14

case TelephonyManager.NETWORK_TYPE_EHRPD:  //api<11 : replace by 12

case TelephonyManager.NETWORK_TYPE_HSPAP:  //api<13 : replace by 15

strNetworkType = "3G";

break;

case TelephonyManager.NETWORK_TYPE_LTE://api<11 : replace by 13

strNetworkType = "4G";

break;

default:

// http://baike.baidu.com/item/TD-SCDMA 中国移动 联通 电信 三种3G制式

if (_strSubTypeName.equalsIgnoreCase("TD-SCDMA") || _strSubTypeName.equalsIgnoreCase("WCDMA") || _strSubTypeName.equalsIgnoreCase("CDMA2000")) 

{

strNetworkType = "3G";

}

else

{

strNetworkType = _strSubTypeName;

}

break;

 }

Log.e("cocos2d-x", "Network getSubtype : " + Integer.valueOf(networkType).toString());

}

}

Log.e("cocos2d-x", "Network Type : " + strNetworkType);

return strNetworkType;

}