How to best load images from URL in Android ListView

Question

So I have been struggling with the best way to load images in a ListView in Android for a while.

The images come from a server, so can take some time to load. From what I understand there are only 2 ways to implement this:

1 - Load the images on the main thread - This leads to have the correct images display immediately when the view displays and scrolls, but gives poor scrolling performance and can lead to the app hanging and crashing.

2 - Load the images in an AsyncTask. This means the images will be blank when the list display or scroll, but eventually display. Because of caching done by the list, you can also get the wrong image for an item. But this gives good performance and scrolling, and does not hang/crash.

Seems like neither solution works correctly. There must be a solution that works?? I have seen other posts like this, but the answer seems to always be 1 or 2, but neither is a good solution...

My code for the list adapter is below. The HttpGetImageAction.fetchImage() method either executes an async task, or fetches the image on the main thread depending on a flag I set. I also cache the images locally and on disk once they have been loaded, so the issue mainly occur the first time (but the cache is only for 100 images, and the list has 1000s)

public class ImageListAdapter extends ArrayAdapter<WebMediumConfig> {

Activity activity;

public ImageListAdapter(Activity activity, int resourceId, List<WebMediumConfig> items) {
    super(activity, resourceId, items);
    this.activity = activity;
}

class ImageListViewHolder {
    ImageView imageView;
    TextView nameView;
    TextView descriptionView;
    TextView statView;
}

public View getView(int position, View convertView, ViewGroup parent) {
    ImageListViewHolder holder = null;
    WebMediumConfig config = getItem(position);

    LayoutInflater mInflater = (LayoutInflater)this.activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.image_list, null);
        holder = new ImageListViewHolder();
        holder.imageView = (ImageView)convertView.findViewById(R.id.imageView);
        holder.nameView = (TextView) convertView.findViewById(R.id.nameView);
        holder.descriptionView = (TextView)convertView.findViewById(R.id.descriptionView);
        holder.statView = (TextView)convertView.findViewById(R.id.statView);
        convertView.setTag(holder);
    } else {
        holder = (ImageListViewHolder) convertView.getTag();
    }

    holder.nameView.setText(Utils.stripTags(config.name));
    holder.descriptionView.setText(Utils.stripTags(config.description));
    holder.statView.setText(config.stats());
    if (MainActivity.showImages) {
        HttpGetImageAction.fetchImage(this.activity, config.avatar, holder.imageView);
    } else {
        holder.imageView.setVisibility(View.GONE);
    }

    return convertView;
  }
}

Using a 3rd party library like Glide is not an option ? It loads images async, can cache them and many more, to avoid wrong image in the wrong place, you have to cancel image loading for that imageView. There are tons of tutorials on how to do this. — danypata
– danypata, Commented Oct 12, 2018 at 14:51
Not looking for a framework, it should not be complicated code. From my understanding the frameworks are doing async loading, so the list would display empty and slowly fill in, and does not help with having the wrong image in the wrong place. Unless there is some magic they are doing, in which case, what is this magic?? — James
– James, Commented Oct 13, 2018 at 15:46
FYI, if I load the images on the main thread they are there almost instantly, but if loaded async it takes several seconds for them to load. — James
– James, Commented Oct 13, 2018 at 15:48

Ruchira Randana · Accepted Answer · 2018-11-09 04:43:01Z

You should never load images on the main thread. Any network calls should be done asynchronously and should not be done on the main thread. Your images might load quickly (on the main thread) because you may have a good internet connection, have small images and/or have few images. But imagine what would happen if someone using your app has a slower internet and then one day your list grows to hundreds!

The approach below is a well accepted practice for loading scrollview content

a) load your text content as you load the scrollview. Again the loading should be done async but you can show a loading view until the download completes
b) Show image placeholders while the image loads on each cell
c) Load the images asynchronously

Using a library such as Picasso would help immensely because there is a lot of boilerplate code which you'd need to handle otherwise such as

cancelling image download when a cell is reused and
starting a new download for a reused cell
caching
retrying a failed download

Hope this helps.

thorin86 · Accepted Answer · 2018-10-12 14:53:17Z

0

Use Glide [https://github.com/bumptech/glide] or Picasso [http://square.github.io/picasso/] - both libraries are very similar, and easy to use, have caching, work in background, allow placeholders ets. Usage is as simple as:

Picasso.get().load("http://i.imgur.com/DvpvklR.png").into(imageView);

answered Oct 12, 2018 at 14:53

thorin86

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Comments

Jitesh Mohite · Accepted Answer · 2018-11-09 03:50:50Z

0

Simple Solution: Glide.

Glide is a fast and efficient open source media management and image loading framework for Android that wraps media decoding, memory and disk caching, and resource pooling into a simple and easy to use interface. Glide supports fetching, decoding, and displaying video stills, images, and animated GIFs.

You can load the image like:

GlideApp.with(context)
    .load("http://via.placeholder.com/300.png")
    .into(imageView);

Refer for more info:

https://guides.codepath.com/android/Displaying-Images-with-the-Glide-Library https://github.com/bumptech/glide

answered Nov 9, 2018 at 3:50

Jitesh Mohite

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Community · Accepted Answer · 2020-06-20 09:12:55Z

0

Use Glide library.. Its recommended by Google.

Step 1:

Use latest Glide Version 4 dependency (https://github.com/bumptech/glide)

implementation 'com.github.bumptech.glide:glide:4.8.0'

annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'

Step 2:

 Glide.with(MainActivity.this)
        .load(url)
        .apply(new RequestOptions().placeholder(R.drawable.placeholder).error(R.drawable.error_image))//this line optional - you can skip this line
        .into(imageview);

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Nov 9, 2018 at 8:04

Ranjithkumar

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Rajat Negi · Accepted Answer · 2018-11-13 19:57:46Z

0

use picasso or Glide Library What these library do , is that they image url from u and download them and save it in cache so that whenever you open the same image another time it will load faster and it prevents the usage of the network

Picasso http://square.github.io/picasso/

Glide https://github.com/bumptech/glide

answered Nov 13, 2018 at 19:57

Rajat Negi

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1 Comment

Ferdz Over a year ago

Careful, OP already said in comments he wasn't interested in Picasso

Shamsul · Accepted Answer · 2018-11-14 07:57:54Z

0

You can try UnivarsalImageLoader which is quite Fast and Optimised. It supports Multithread image loading (async or sync) and high level of customization.

https://github.com/nostra13/Android-Universal-Image-Loader

answered Nov 14, 2018 at 7:57

Shamsul

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Cruces · Accepted Answer · 2018-11-14 15:38:29Z

Here's how I do it

First I always create the RecyclerView.ViewHolder to which I pass a Func<int, Bitmap> image_provider (or you can pass some sort of lamda?) which when called will retrieve the image for a specific Id, if it can't it will show the default loading image

Everything is stored in a fragment (which I call a DataFragment) which has retainstate set to true.

First load a list of json objects that tell me which images I must show, this happens inside the data fragment so it will go on if there is a configuration change

I send that info to the adapter using a method like SetItems(MyImages)

Then I start a new thread that will load the images (while allowing the user to work)

I do this with the TPL library, the closest approximation for Android is Anko Async but you can also do it with AsyncTask, the problem is that I send a lot of messages to the main thread, so to do it with AsyncTask you have to give it a handler to the main thread which will send messages.

In the thread I loop through all the images I have to download, and download them and send a message to the DataFragment which sends it to the currently attached Activity which triggers the NotifyItemChanged method in the adapter

The adapter on creation receives a Func<int, Bitmap> image_provider which it invokes and retrieves the image from memory

I know it sounds a bit messy, so if you want code examples I can give them , but they are in C#

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

In your app level gradle implement below repository:

implementation 'com.squareup.picasso:picasso:2.5.2'

Put below line where you want to load image

 Picasso.with(getApplicationContext()).load(config.avatar).into(imageview);

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Nov 15, 2018 at 11:11

suresh madaparthi

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Ashish Chaugule · Accepted Answer · 2018-11-15 11:14:57Z

0

just use Picasso.get().load("https://i.sstatic.net/jEIKP.jpg").into(imageView); or Glide.with(getApplicationContext()).load("image_url").asBitmap().centerCrop().into(new BitmapImageViewTarget(imageView)

in adapter like any view and done no extra efforts required

answered Nov 15, 2018 at 11:14

Ashish Chaugule

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