Launch an activity from a different class

I am trying to launch an activity in the onPostExecute method of an AsyncTask. This async class is implemented in another class which dosent extends an activity. But I am passing application context as an argument to the method in this c开发者_高级运维lass. Here is the sample code

@Override
        protected void onPostExecute(String result) 
        {
            try
            {
                System.out.println("Response : "+result);
                Toast.makeText(context, "Account Successfully Created", Toast.LENGTH_LONG).show();
                Intent intent = new Intent(context,OperationPanelActivity.class);
                context.startActivity(intent);
             }
             catch(Exception e)
             {
                   Log.d("Error: ", e.getMessage());
             }
        }

Inside this class I am taking the application context like this

public void createUser(String userName,String password,String firstName,String lastName,String email,Context context)
    {
        InvokeWebService service = new InvokeWebService();
        CALL_URL = Global.SERVICE_URL+"createuserget";
        this.context = context;
        service.execute(new String[] {userName,password,firstName,lastName,email});
    }

But the new activity is not getting invoked.

How can I do this in android? Thanks

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This is because your activity could be finished by the time you run onPostExecute. You should notify the activity somehow and let the activity start the new activity