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;
	}
}