RecyclerView blinking after notifyDatasetChanged()

Question

I have a RecyclerView which loads some data from API, includes an image url and some data, and I use networkImageView to lazy load image.

@Override
public vo         


        

Answer 1

In Kotlin you can use 'class extension' for RecyclerView:

fun RecyclerView.disableItemAnimator() {
    (itemAnimator as? SimpleItemAnimator)?.supportsChangeAnimations = false
}

// sample of using in Activity:
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    // ...
    myRecyclerView.disableItemAnimator()
    // ...
}

Answer 2

Kotlin solution:

(recyclerViewIdFromXML.itemAnimator as SimpleItemAnimator).supportsChangeAnimations = false

Answer 3

Hey @Ali it might be late replay. I also faced this issue and solved with below solution, it may help you please check.

LruBitmapCache.java class is created to get image cache size

import android.graphics.Bitmap;
import android.support.v4.util.LruCache;
import com.android.volley.toolbox.ImageLoader.ImageCache;

public class LruBitmapCache extends LruCache<String, Bitmap> implements
        ImageCache {
    public static int getDefaultLruCacheSize() {
        final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
        final int cacheSize = maxMemory / 8;

        return cacheSize;
    }

    public LruBitmapCache() {
        this(getDefaultLruCacheSize());
    }

    public LruBitmapCache(int sizeInKiloBytes) {
        super(sizeInKiloBytes);
    }

    @Override
    protected int sizeOf(String key, Bitmap value) {
        return value.getRowBytes() * value.getHeight() / 1024;
    }

    @Override
    public Bitmap getBitmap(String url) {
        return get(url);
    }

    @Override
    public void putBitmap(String url, Bitmap bitmap) {
        put(url, bitmap);
    }
}

VolleyClient.java singleton class [extends Application] added below code

in VolleyClient singleton class constructor add below snippet to initialize the ImageLoader

private VolleyClient(Context context)
    {
     mCtx = context;
     mRequestQueue = getRequestQueue();
     mImageLoader = new ImageLoader(mRequestQueue,getLruBitmapCache());
}

I created getLruBitmapCache() method to return LruBitmapCache

public LruBitmapCache getLruBitmapCache() {
        if (mLruBitmapCache == null)
            mLruBitmapCache = new LruBitmapCache();
        return this.mLruBitmapCache;
}

Hope its going to help you.

Answer 4

Try to use the stableId in recycler view. The following article briefly explains it

https://medium.com/@hanru.yeh/recyclerviews-views-are-blinking-when-notifydatasetchanged-c7b76d5149a2

Answer 5

According to this issue page ....it is the default recycleview item change animation... You can turn it off.. try this

recyclerView.getItemAnimator().setSupportsChangeAnimations(false);

Change in latest version

Quoted from Android developer blog:

Note that this new API is not backward compatible. If you previously implemented an ItemAnimator, you can instead extend SimpleItemAnimator, which provides the old API by wrapping the new API. You’ll also notice that some methods have been entirely removed from ItemAnimator. For example, if you were calling recyclerView.getItemAnimator().setSupportsChangeAnimations(false), this code won’t compile anymore. You can replace it with:

ItemAnimator animator = recyclerView.getItemAnimator();
if (animator instanceof SimpleItemAnimator) {
  ((SimpleItemAnimator) animator).setSupportsChangeAnimations(false);
}

Answer 6

for my application, I had some data changing but I didn't want the entire view to blink.

I solved it by only fading the oldview down 0.5 alpha and starting the newview alpha at 0.5. This created a softer fading transition without making the view disappear completely.

Unfortunately because of private implementations, I couldn't subclass the DefaultItemAnimator in order to make this change so I had to clone the code and make the following changes

in animateChange:

ViewCompat.setAlpha(newHolder.itemView, 0);  //change 0 to 0.5f

in animateChangeImpl:

oldViewAnim.alpha(0).setListener(new VpaListenerAdapter() { //change 0 to 0.5f