android 网络连接判断

Android 网络判断类，用来判断网络状态

使用方法：

（1）先初始化

//初始化网络状态检测类

NetworkStateManager.instance().init(this);

（2）判断是否联网

 NetworkStateManager.instance().isNetworkConnected();

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;
  }
  
}