RecyclerView lags in scrolling

Question

I have a recyclerview with cardview in it. Also having imageview, textview. I am decoding my images using Base64 decoding scheme and displaying images within the cardview.It loads the images but producing the lag effect

onBindViewHolder code

holder.iv_contestant_image.setImageBitmap(new ProcessImage().getBitmage(contestant.getContestant_image()));

ProcessImage code

byte[] decodedString = Base64.decode(strBitmap, Base64.DEFAULT); Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); return decodedByte;

Is something wrong am I doing ?

Try to use some libraries for Image Loading.

Pratik Butani
– Pratik Butani

2016-10-27 05:26:37 +00:00
Commented Oct 27, 2016 at 5:26 — Pratik Butani
– Pratik Butani, Commented Oct 27, 2016 at 5:26

subrahmanyam boyapati · Accepted Answer · 2016-10-27 05:24:03Z

1

you can use any image loading libraries. Some of libraries are Picasso Glide Fresco

answered Oct 27, 2016 at 5:24

subrahmanyam boyapati

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4 Comments

Akshay Dusane Over a year ago

I have seen Picassso but it do not load Bitmap images

subrahmanyam boyapati Over a year ago

Are you trying to load from url?

Akshay Dusane Over a year ago

No, I get a string to which I convert into byte array and do the Base64 decoding and load the image

subrahmanyam boyapati Over a year ago

No need to do all these thing just pass your url it will do all things for you.

Amad Yus · Accepted Answer · 2016-10-27 06:13:54Z

I do believe decoding process is not instant depending on the size of the bitmap. So, try perform decoding bitmap with AsyncTask

class BitmapWorkerTask extends AsyncTask<Void, Void, Bitmap> { private final WeakReference<ImageView> imageViewReference; private String base64Img; public BitmapWorkerTask(ImageView imageView, String base64Img) { imageViewReference = new WeakReference<ImageView>(imageView); this.base64Img = base64Img; } @Override protected Bitmap doInBackground(Void... params) { byte[] decodedString = Base64.decode(base64Img, Base64.DEFAULT); Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); return decodedByte; } @Override protected void onPostExecute(Bitmap bitmap) { if (imageViewReference != null && bitmap != null) { imageViewReference.get().setImageBitmap(bitmap); } }

Inside onBindViewHolder

new BitmapWorkerTask(holder.iv_contestant_image, stringBitmap).execute();

This might cause an NPE. If the decoding is slower than the scrolling speed. Because of the View destroy and recreation.
I will try this, and the same problem I do have for cardView which having seekbar, the sliding effect lags what will be the reason for it ?

EKN · Accepted Answer · 2016-10-27 06:26:19Z

you can implement lazy image loading in your recycle view for fix this issue. http://blogs.innovationm.com/lazy-loading-and-memory-management-of-images-in-listview-in-android/

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