Retrofit and Activity Lifecycle

Question

I want to make a REST Client with Android and I read about retrofit. When I do some requests with retrofit even if the activity is destroyed the callback is executed.

How can I stop receiving the response after the activity is being destroyed?

apiService.getDummieContent().enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {

    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {

    }
});

Answer 1

You can declare global variable apiService

Call<ReponseBody> apiService;

and then call api method for instance here getDummieContent().Moreover you can manually check for the if call is cancelled in OnFaliure method. As in my case i was disabling swipeRefreshLayout which was getting null context on DestroyView because onFailure method was only called when view was destroyed, so with the help of this condition i always checked whether it is cancelled after on destroyed hence preventing exception.

apiService.getDummieContent().enqueue(new Callback<ResponseBody>() {

   @Override
   public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) 
   {

     // Do stuff here

   }

  @Override
  public void onFailure(Call<ResponseBody> call, Throwable t) {

  t.printStackTrace();

  if(call.isCanceled())
   {
      Log.e("isCanceled", " isCanceled");// check if it is cancelled on OnDestroy

   }

}

});

and in on destory onDestroy

@Override
public void onDestroy() {
    super.onDestroy();
    call.cancel();
}

Answer 2

You can assign the request to a variable and cancel it on activity destroy:

Call<ReponseBody> call = apiService.getDummieContent();
call.enqueue(...);

@Override
protected void onDestroy() {
    super.onDestroy();
    call.cancel();
}