json - Intent inside AsyncTask (Not accessible in scope) -

first of all, want apologize bad english.

i'm using asynctask class, called main_activity, , when in postexecute call de intent, error "not enclosing instance type accesible in scope"

package com.example.pfc;  import android.os.bundle; import android.app.activity;`enter code here` import android.content.intent; import android.view.menu; import android.view.view; import android.widget.button; import android.widget.textview;  public class principal extends activity {     private button botonsalir;     private button botonatras;     private button botonclientes;     private button botonmaquinas;         @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_principal);          botonsalir = (button) findviewbyid(r.id.botonsalir);         botonatras = (button) findviewbyid(r.id.botonatras);         botonclientes = (button) findviewbyid(r.id.botonclientes);         botonmaquinas = (button) findviewbyid(r.id.botonmaquinas);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.activity_principal, menu);         return true;     }      public void atras(view view){         finish();     }      public void listaclientes(view view){          sendclientes send = new sendclientes();         send.execute("clientes");     }     public void listamaquinas(view view){          sendmaquinas send = new sendmaquinas();             send.execute("servidores");         }      } 

and asynctask "send":

package com.example.pfc;  import java.io.ioexception; import java.util.list; import java.util.concurrent.timeoutexception;  import org.json.jsonexception; import org.json.jsonobject;  import android.content.intent; import android.os.asynctask;  import com.rabbitmq.client.amqp; import com.rabbitmq.client.address; import com.rabbitmq.client.basicproperties; import com.rabbitmq.client.channel; import com.rabbitmq.client.connection; import com.rabbitmq.client.connectionfactory; import com.rabbitmq.client.consumercancelledexception; import com.rabbitmq.client.queueingconsumer; import com.rabbitmq.client.rpcclient; import com.rabbitmq.client.shutdownsignalexception;   public class sendclientes extends asynctask <string,void,void> { private string requestqueuename = "rpc_queue"; private string replyqueuename; private queueingconsumer consumer;      protected void doinbackground(string... p) {          string mensaje = p[0];         connectionfactory cfactory = new connectionfactory();         connection connection;          //json object          jsonobject json = new jsonobject();         try {         json.put("request", mensaje);          } catch (jsonexception e) {             // todo auto-generated catch block             e.printstacktrace();         }          //conexion         try {             address[] addrs= new address[1];             addrs[0] = address.parseaddress("84.126.242.244");              connection = cfactory.newconnection(addrs);         cfactory.setport(5672);         channel channel = connection.createchannel();         replyqueuename = channel.queuedeclare().getqueue();         consumer = new queueingconsumer(channel);         channel.basicconsume(replyqueuename, true,consumer);          string corrid = java.util.uuid.randomuuid().tostring();          //propiedades enviadas al servidor         amqp.basicproperties props = new amqp.basicproperties()                             .builder()                             .correlationid(corrid)                             .replyto(replyqueuename)                             .build();         channel.basicpublish("", replyqueuename, props,     json.tostring().getbytes());          //esperando respuesta del servidor         while (true) {             queueingconsumer.delivery delivery = consumer.nextdelivery();             if (delivery.getproperties().getcorrelationid().equals(corrid))             {                 string respuesta = new string(delivery.getbody());                 break;             }         }           //eliminamos la cola del servidor, tras haber recibido el mensaje         channel.queuedelete(replyqueuename);         //cerramos canal y conexion         channel.close();         connection.close();         } catch (ioexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (shutdownsignalexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (consumercancelledexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (interruptedexception e) {             // todo auto-generated catch block             e.printstacktrace();         }      // todo auto-generated method stub     return null;   }  //capturamos la respuesta en el posexecute protected void onpostexecute(string respuesta) {     //lanzamos el intent la actividad de usuarios, poniendo en el intent la respuesta del servidor.       intent intent = new intent(principal.this, activity_usuarios.class); //error "no enclosing instance of type principal accessible in scope"   } 

}

thanks in advance.

bye!

i think providing wrong context in intent. suggest make sendclientes asynctask private within principal activity. or create class has sendclientes inner private class, , provide context through constructor (if want principal , sendclientes classes seperated).

similar problem: no enclosing instance of type mainactivity accessible in scope