import android.content.Context;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

public class NetworkStateManager

{

	static NetworkStateManager s_m = null;

	private Context context;

	private NetworkStateManager()

	{

	}

	public void init(Context ctx)

	{

		context = ctx;

	}

	public static synchronized NetworkStateManager instance()

	{

		if (s_m == null)

		{

			s_m = new NetworkStateManager();

		}

		return s_m;

	}

	/**

	 * 判断是否有网络连接

	 * @return

	 */

	public boolean isNetworkConnected()

	{

		if (context == null)

		{

			return false;

		}

		ConnectivityManager connectivity = (ConnectivityManager) context

				.getSystemService(Context.CONNECTIVITY_SERVICE);

		if (connectivity == null)

		{

			return false;

		} else

		{

			NetworkInfo[] info = connectivity.getAllNetworkInfo();

			if (info != null)

			{

				for (int i = 0; i < info.length; i++)

				{

					if (info[i].getState() == NetworkInfo.State.CONNECTED)

					{

						return true;

					}

				}

			}

		}

		return false;

	}

	/**

	 * 判断WIFI网络是否可用

	 * @return

	 */

	public boolean isWifiConnected()

	{

		if (context != null)

		{

			ConnectivityManager mConnectivityManager = (ConnectivityManager) context

					.getSystemService(Context.CONNECTIVITY_SERVICE);

			NetworkInfo mWiFiNetworkInfo = mConnectivityManager

					.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

			if (mWiFiNetworkInfo != null)

			{

				return mWiFiNetworkInfo.isAvailable();

			}

		}

		return false;

	}

	/**

	 * 判断MOBILE网络是否可用

	 * @return

	 */

	public boolean isMobileConnected()

	{

		if (context != null)

		{

			ConnectivityManager mConnectivityManager = (ConnectivityManager) context

					.getSystemService(Context.CONNECTIVITY_SERVICE);

			NetworkInfo mMobileNetworkInfo = mConnectivityManager

					.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

			if (mMobileNetworkInfo != null)

			{

				return mMobileNetworkInfo.isAvailable();

			}

		}

		return false;

	}

	public int getConnectedType()

	{

		if (context != null)

		{

			ConnectivityManager mConnectivityManager = (ConnectivityManager) context

					.getSystemService(Context.CONNECTIVITY_SERVICE);

			NetworkInfo mNetworkInfo = mConnectivityManager

					.getActiveNetworkInfo();

			if (mNetworkInfo != null && mNetworkInfo.isAvailable())

			{

				return mNetworkInfo.getType();

			}

		}

		return -1;

	}

}