Android中判断网络是否连接实例详解

public class ConnectionDetector {      private Context _context;      public ConnectionDetector(Context context){     this._context = context;   }    public boolean isConnectingToInternet(){     ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);      if (connectivity != null)       {        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;   } 

ConnectionDetector cd = new ConnectionDetector(getApplicationContext());    Boolean isInternetPresent = cd.isConnectingToInternet(); //