title: Unable to start activity ComponentInfo java.lang.IllegalStateException: System services not available to Activities before onCreate()
body: <p>I am trying to see if the user has internet connection when the app starts:</p>
  
  <pre><code>package nco.supp;
  
  import android.app.Activity;
  import android.app.AlertDialog;
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.widget.Button;
  import nco.supp.Status;
  import nco.supp.Register;
  
  public class ncosuppActivity extends Activity {
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
  
          NetworkManager networkManager = new NetworkManager();
          if (!networkManager.haveNetworkConnection()) {
  
              AlertDialog.Builder dlgAlert  = new AlertDialog.Builder(this);
              dlgAlert.setPositiveButton("Ok", null);
  
          }
  
          Button loginButton = (Button) findViewById(R.id.loginButton);
          loginButton.setOnClickListener(new OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  startActivity(new Intent(ncosuppActivity.this, Status.class));
  
              }
          });
  
          Button registerButton = (Button) findViewById(R.id.registerButton);
          registerButton.setOnClickListener(new OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  startActivity(new Intent(ncosuppActivity.this, Register.class));
  
              }
          });
      }
  }
  </code></pre>
  
  <hr>
  
  <pre><code>package nco.supp;
  
  import android.app.Activity;
  import android.content.Context;
  import android.net.ConnectivityManager;
  import android.net.NetworkInfo;
  
  public class NetworkManager extends Activity{
  
  
      public boolean haveNetworkConnection() {
          boolean haveConnectedWifi = false;
          boolean haveConnectedMobile = false;
  
          ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
          NetworkInfo[] netInfo = cm.getAllNetworkInfo();
          for (NetworkInfo ni : netInfo) {
              if (ni.getTypeName().equalsIgnoreCase("WIFI"))
                  if (ni.isConnected())
                      haveConnectedWifi = true;
              if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
                  if (ni.isConnected())
                      haveConnectedMobile = true;
          }
          return haveConnectedWifi || haveConnectedMobile;
      }
  
  
  }
  </code></pre>
  
  <p>I am getting this error:</p>
  
  <pre><code>java.lang.RuntimeException: Unable to start activity ComponentInfo{nco.supp/nco.supp.ncosuppActivity}:
  java.lang.IllegalStateException: System services not available to Activities before onCreate()
  </code></pre>
  
  <p>any ideas??</p>