如何正确刷新我的回收商列表视图

Question

I start using RecyclerView on my new school projects and RealmDB as data source. So far it is quite okay until i refresh the list view. here is demo . There is black screen flashing happening because of notifyDataSetChanged() . I can set white background instead of black if i want to make it less obvious.

But what mechanism should i be using to totally eliminate that obvious screen flashing ? I would be very much appreciate if i would obtain same result like here

How do i refresh the list view so far ?

• STEP 1. I called web api to received posts

• STEP 2. Obtain the result and update or add it to #realm

   mRealm.executeTransactionAsync(new Realm.Transaction() { @Override public void execute(Realm realm) { for (Post post : posts) { //create post realm.copyToRealmOrUpdate(post); //create common result row CommonResult cr = new CommonResult(); int id = module.hashCode() + post.getId(); cr.setId(id); cr.setPost(post); cr.setPostid(post.getId()); cr.setTag(module.hashCode()); realm.copyToRealmOrUpdate(cr); } } }, new Realm.Transaction.OnSuccess() { @Override public void onSuccess() { RealmResults<CommonResult> cr = mRealm.where(CommonResult.class) .equalTo("tag", module.hashCode()) .findAll(); mPostView.showListingView(cr, hasNext()); } }); 

• STEP 3. Realm will notify the changes to adapter and the notify block will call notifyDataSetChanged() on recycler adapter.

In My Adapter ( RecyclerView.Adapter )

this.data.addChangeListener(new RealmChangeListener<RealmResults<CommonResult>>() {
    @Override
    public void onChange(RealmResults<CommonResult> element) {
        notifyDataSetChanged();
    }
});

UPDATE I had changed notifyDataSetChanged() to notifyItemChanged(i, element) . The flashing is gone and animation become more smooth :-)

Answer 1

Guys thanks for the comments and I get it solved by eliminating the use of notifyDataSetChanged() .

Changed from

this.data.addChangeListener(new RealmChangeListener<RealmResults<CommonResult>>() {
    @Override
    public void onChange(RealmResults<CommonResult> element) {
        notifyDataSetChanged();
    }
});

to

 this.data.addChangeListener(new RealmChangeListener<RealmResults<CommonResult>>() {
            @Override
            public void onChange(RealmResults<CommonResult> element) {
                notifyItems(element);
                Timber.i("onChange() called with: element = [" + element + "]");
            }
        });


private void notifyItems(RealmResults<CommonResult> element){
        for (int i = 0; i < element.size(); i++) {
            notifyItemChanged(i, element.get(i));
        }
    }