How to get correct RecyclerView ViewHolder after leaving the activity

Question

I have a recyclerview and I populate data on it using firebaserecycleradapter. Every item in the list contains reference to firebase storage. So When I click on download button (red button), the download start and I can get informations about the view. When the download is in progress and I leave the activity and come back the download still on progress but never return the correct item View.

How can I get the correct item View when I come back so that I can show the download progress at specific item and make some changes to that specific item when download complete.

Code behind download button

storageReference.getFile(zipFile)
                    .addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
                        @Override
                        public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
                            Log.d("visibilitedocSuccess", ""+holder+"|"+key+"|holder"+holder+"|holderid:"+holder.getAdapterPosition()+"|oldpos:"+holder.getOldPosition());

                                holder.txtProgress.setVisibility(View.GONE);
                                holder.progressBar.setVisibility(View.GONE);
                                holder.imgDocumentChecker.setVisibility(View.VISIBLE);
                                holder.imgDocumentChecker.setImageResource(R.drawable.done_ic);

                        }
                    })
                    .addOnProgressListener(new OnProgressListener<FileDownloadTask.TaskSnapshot>() {
                        @Override
                        public void onProgress(FileDownloadTask.TaskSnapshot taskSnapshot) {
                            double progress = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
                            Log.d("visibilitedocProgress:", progress + "% done"+"|holder"+holder+"|holderid:"+holder.getAdapterPosition()+"|oldpos:"+holder.getOldPosition());
                            holder.txtProgress.setText(((int) progress) + "%");
                            holder.progressBar.setProgress((int) progress);

                        }
                    }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Log.d("visibilitedocFail:", e + "");
                    holder.txtProgress.setVisibility(View.GONE);
                    holder.progressBar.setVisibility(View.GONE);
                    holder.imgDocumentChecker.setVisibility(View.VISIBLE);
                    holder.imgDocumentChecker.setImageResource(R.drawable.download_icon);
                    Toasty.error(DocumentsListActivity.this, "Chargement annulé", Toast.LENGTH_LONG, true).show();
                }
            });

Logcat shows below informations related to the ViewHolder

ViewHolder{ace0130 position=-1 id=-1, oldPos=-1, pLpos:-1 unbound no parent}

How to fixe it please ?

score 0 · Accepted Answer · answered Apr 19 '18 at 14:51

0

I am not entirely sure by what you mean by "get the correct item View". However what I understand from your question I think the issue you are having is coming from the fact that you do not update the UI.

Let me explain, whenever you get out and comeback to the activity which is downloading you "recreate" the RecyclerView. So You cannot access the previous items that where displayed.

Two choices here:

Either you save the state of the things you are downloading (you can find lots of articles on that using google :))
Or you have some class in your code that keeps the information that way when you go back to the downloading activity you simply need to update the view items :)

answered Apr 19 '18 at 14:51

orion

31
3

Yes my issue is coming from the fact that I do not update the UI correctly when I leave and comeback to the activity. Thank a lot for your suggestions. – Jean-Pascal MEWENEMESSE Apr 19 '18 at 15:06
Ok! So what I did (I had something similar to do) was to save the information regarding the download of the elements on a model class. That way whenever I get back to the activity I simply need to get the data from my model and update the RecyclerView items accordingly :). – orion Apr 19 '18 at 15:12
If it is only these two choices I have, I will then manage with your first suggestion. I will save the downloading View and state using EventBus and then update the UI with that view When I come back. – Jean-Pascal MEWENEMESSE Apr 19 '18 at 15:21

How to get correct RecyclerView ViewHolder after leaving the activity

1 Answers1