android判断用户网络类型

Nettestactivity代码  

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;
    }
}