CODEWITHSUNDEEP
androidandroid-recyclerviewnotifydatasetchanged
sneha archirayan
sneha archirayan

Reputation: 31

RecyclerView adapter update in handler

I am new in android development. My application have timer like 8sec , 7sec ,6sec and so on... So i have put time in model class and using handler i am updating that model class value on every sec secondly i have to update my recycler view.. Here my code (till now i have tried this below)

  public void startTimerUpdate() {

        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {
                Gson gson = new Gson();
                Type type = new TypeToken<ArrayList<ProductDetail>>() {
                }.getType();
                arrayList = gson.fromJson(ReadSharePrefrence(getActivity(), ALLPRODUCT), type);
                Log.d("UpdateTime", getTimeInCounter(arrayList.get(0).getCounter()));

                recyclerAdapter.notifyDataSetChanged();
                handler.postDelayed(runnable, 1000);
            }
        };
        handler.postDelayed(runnable, 1000);
    }

but at a every second i am getting 'UpdateTime' perfectly in my log but recyclerView is not updating.

Guide me

yes , i had bind arraylist to recyclerview adpater here is code.

   recyclerAdapter = new HomeRecyclerAdapter(getActivity(), arrayList, getActivity().getSupportFragmentManager());
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.addItemDecoration(new SimpleDividerItemDecoration(getActivity()));
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(recyclerAdapter);

Upvotes: 0

Views: 2892

Answers (2)

savepopulation
savepopulation

Reputation: 11921

If you know the position of the item which you want to update it's data you can try to use notifyItemChanged(int position) method of adapter instead of recyclerAdapter.notifyDataSetChanged();

Here's the link: https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html#notifyItemChanged(int,%20java.lang.Object)

Notify any registered observers that the item at position has changed. Equivalent to calling notifyItemChanged(position, null);.

This is an item change event, not a structural change event. It indicates that any reflection of the data at position is out of date and should be updated. The item at position retains the same identity.

Edit:

If you have multiple items updated on timer you can take 

Gson gson = new Gson();
Type type = new TypeToken<ArrayList<ProductDetail>>() {
                }.getType();
    arrayList = gson.fromJson(ReadSharePrefrence(getActivity(), ALLPRODUCT), type);

this code block out of handler and just handle your operation getCounter() in handler. With this approach, you avoid doing read/write in handler in every 1 second.

Upvotes: 1

Divyesh Patel
Divyesh Patel

Reputation: 2576

try this in handler:

arrayList.clear();
Gson gson = new Gson();
                Type type = new TypeToken<ArrayList<ProductDetail>>() {
                }.getType();
arrayList.addAll(gson.fromJson(ReadSharePrefrence(getActivity(), ALLPRODUCT), type));
recyclerAdapter.notifyDataSetChanged();

Upvotes: 1

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