Error: constructor de intenciones indefinidas al iniciar el servicio en android

Estoy intentando comenzar el servicio en la actividad. Pero muestra error como "el constructor Intent (SampleService, MyService) es undefined"

MyService.java

• ¿Puede Activity.getIntent () devolver alguna vez null?
• ¿Por qué dos parámetros al constructor ComponentName?
• Iniciar siempre una nueva instancia de actividad sin historial
• No se ha encontrado actividad para manejar Intent with action.DIAL
• Solicitar actividad predeterminada sin abrir realmente la actividad

public class MyService extends Service { @Override public IBinder onBind(Intent intent) { return null; } public static boolean isInstanceCreated() { return instance != null; } @Override public void onCreate() { Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show(); Log.d(TAG, "onCreate"); instance = this; } @Override public void onDestroy() { Toast.makeText(this, "My Service Stopped", Toast.LENGTH_LONG).show(); Log.d(TAG, "onDestroy"); instance = null; } @Override public void onStart(Intent intent, int startid) { Toast.makeText(getBaseContext(), "Service started",Toast.LENGTH_SHORT).show(); } } 

Inicio del servicio desde SampleService.java

  public class SampleService extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.grid_activity); Intent myintent =new Intent(SampleService.this,MyService.this);//Error show here.. startService(myintent); } } 

Servicio inicializado en archivo de manifiesto.

  <service android:enabled="true" android:name="com.MyApp.MyService" /> 

Ayúdame a resolver el error.

 Intent myintent =new Intent(SampleService.this,MyService.Class); 

  Intent myintent =new Intent(SampleService.this,MyService.this); 

  Intent myintent =new Intent(SampleService.this,MyService.Class); // first param is a context second param is a class in your case a MyServiceClass 

 public Intent (Context packageContext, Class<?> cls) Added in API level 1 Create an intent for a specific component. All other fields (action, data, type, class) are null, though they can be modified later with explicit calls. This provides a convenient way to create an intent that is intended to execute a hard-coded class name, rather than relying on the system to find an appropriate class for you; see setComponent(ComponentName) for more information on the repercussions of this. Parameters packageContext A Context of the application package implementing this class. cls The component class that is to be used for the intent.