/**

	 * 推断移动网络是否开启

	 *

	 * @param context

	 * @return

	 */

	public static boolean isNetEnabled(Context context) {

		TelephonyManager tm = (TelephonyManager) context

				.getSystemService(Context.TELEPHONY_SERVICE);

		if (tm != null) {

			if (tm.getNetworkType() != TelephonyManager.NETWORK_TYPE_UNKNOWN) {

				Log.i("sjf", "移动网络已经开启");

				return true;

			}

		}

		Log.i("sjf", "移动网络还未开启");

		return false;

	}

	/**

	 * 推断WIFI网络是否开启

	 *

	 * @param context

	 * @return

	 */

	public static boolean isWifiEnabled(Context context) {

		WifiManager wm = (WifiManager) context

				.getSystemService(Context.WIFI_SERVICE);

		if (wm != null && wm.isWifiEnabled()) {

			Log.i("sjf", "Wifi网络已经开启");

			return true;

		}

		Log.i("sjf", "Wifi网络还未开启");

		return false;

	}

	/**

	 * 推断移动网络是否连接成功

	 *

	 * @param context

	 * @return

	 */

	public static boolean isNetContected(Context context) {

		ConnectivityManager cm = (ConnectivityManager) context

				.getSystemService(Context.CONNECTIVITY_SERVICE);

		NetworkInfo info = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

		if (cm != null && info != null && info.isConnected()) {

			Log.i("sjf", "移动网络连接成功");

			return true;

		}

		Log.i("sjf", "移动网络连接失败");

		return false;

	}

	/**

	 * 推断WIFI是否连接成功

	 *

	 * @param context

	 * @return

	 */

	public static boolean isWifiContected(Context context) {

		ConnectivityManager cm = (ConnectivityManager) context

				.getSystemService(Context.CONNECTIVITY_SERVICE);

		NetworkInfo info = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

		if (info != null && info.isConnected()) {

			Log.i("sjf", "Wifi网络连接成功");

			return true;

		}

		Log.i("sjf", "Wifi网络连接失败");

		return false;

	}

	/**

	 * 推断移动网络和WIFI是否开启

	 *

	 * @param context

	 * @return

	 */

	public static boolean isNetWorkEnabled(Context context) {

		return (isNetEnabled(context) || isWifiEnabled(context));

	}

	/**

	 * 推断移动网络和WIFI是否连接成功

	 * @param context

	 * @return

	 */

	public static boolean isNetworkConnected(Context context) {

		return (isWifiContected(context) || isNetContected(context));

	}

操作Wifi须要AndroidManifest.xml在进行一些配置：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"></uses-permission>

    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>

    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>

WIFI 的主要操作权限有四个： 

 CHANGE_NETWORK_STATE ：同意改动网络状态的权限。 

 CHANGE_WIFI_STATE ：同意改动 WIFI 状态的权限。 

 ACCESS_NETWORK_STATE ：同意訪问网络状态的权限。 

 ACCESS_WIFI_STATE ：同意訪问 WIFI 状态的权限。