android判断用户网络类型

public class NetTestActivity extends Activity {

private static final int CMNET = 3;
private static final int CMWAP = 2;
private static final int WIFI = 1;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getAPNType(this);
}

/**
* 获取当前的网络状态 -1：没有网络
* 1：WIFI网络2：wap网络3：net网络
* @param context
* @return
*/
public static int getAPNType(Context context) {
int netType = -1;
ConnectivityManager connMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

if (networkInfo == null) {
return netType;
}
int nType = networkInfo.getType();
System.out.println("networkInfo.getExtraInfo() is "+ networkInfo.getExtraInfo());
if (nType == ConnectivityManager.TYPE_MOBILE) {
if (networkInfo.getExtraInfo().toLowerCase().equals("cmnet")) {
netType = CMNET;
} else {
netType = CMWAP;
}
} else if (nType == ConnectivityManager.TYPE_WIFI) {
netType = WIFI;
}
return netType;
}
}