What is the best way for an Activity to call itself?

Question

The app displays random questions by following as template to QuestionsActivity, that is, the user chooses true or false and will only change the question (textView) and the screen design will remain the same. My questions are in a AsyncTask, their order is random and should not be repeated but I call this Asynctask no onCreate of my QuestionsActivity. This will give the biggest bug. How do I access "recursively" my QuestionsActivity in a way that only instates my Asynctask ONCE (at the moment that opens the App)?

Answer 1

You can implement your Asynctask class using the default Singleton. This way, you ensure that during the execution of your application there will be only one instance of Asynctask.

It would look something like this:

public class MySingleton {

      // Variavel estática que conterá a instancia do AsyncTask     
      private static MySingleton instance;

     // Construtor privado. Suprime o construtor público padrao.
     private MySingleton() {

     }

     // Método público estático de acesso único ao objeto!
     public static MySingleton getInstance(){

           if(instance == NULL){
                // Uma nova instancia é criada e retornada para quem está //pedindo
               instance = new MySingleton();
           }

          // Retorna o a instância do objeto
          return instance;
     }
}