title: Start current instance of service in an activity
body: <p>I have a service like this:</p>
  
  <pre><code>public class MyService extends Service{
      .
      .
      .
      private Activity source;
      public setActivity(Activity source){
          this.source=source;
      }
  }
  </code></pre>
  
  <p>and an activity like this:</p>
  
  <pre><code>public class MyActivity extends Activity{
      .
      .
      .
      @Override
      public void onCreate(Bundle savedInstanceState){
          .
          .
          MyService service=new MyService();
          service.setActivity(this);
          //in this place I want start my service.
          //but if I use Intent, it run another instance of my service.
          Intent intent = new Intent(this,MyService.class);
          startService(intent);
      }
  }
  </code></pre>
  
  <p>How do I start current instance service? in this place I want start <code>service</code>. </p>