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Android: LruCache issue with Bitmap


Android: LruCache issue with Bitmap

By : Hemchul
Date : November 16 2020, 06:23 AM
To fix this issue Finally I figured out the problem. It is becuase of the adapter. in the adapter I have set some ImageView as invisible if no thumbnail is needed. when the user scrolls the list view, such ImageView instance will be reused, but the visibility is not updated.
so the cache itself is OK now. The solution is to check the visibility of the ImageView and update it if needed.
code :


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When should I recycle a bitmap using LRUCache?

When should I recycle a bitmap using LRUCache?


By : Ernesto A Estrada
Date : March 29 2020, 07:55 AM
it helps some times
I believe that when the LRUCache evicts an image to make room for another one, the memory is not being freed.
Using LruCache to Store Bitmap in Memory

Using LruCache to Store Bitmap in Memory


By : Aaron Hans
Date : March 29 2020, 07:55 AM
seems to work fine You're on the right track, but I couldn't tell where in your code you account for view recycling in your List/GridView. You are indeed reusing the convertView passed to getView, but launching a new AsyncTask in every getView will lead to the tasks loading the images, but then inserting them in the wrong list rows if the view it was started by gets recycled. My advice would be to check out Volley, Google's new networking library. It has a NetworkImageView class that will load an image asynchronously into an ImageView. The reason I recommend it is caching, both on disk and in memory, and view recycling are handled for you.
Volley: https://developers.google.com/events/io/sessions/325304728
code :
// From com.android.volley.toolbox.ImageLoader
public interface ImageCache {
    public Bitmap getBitmap(String url);
    public void putBitmap(String url, Bitmap bitmap);
}

// My ImageCache implementation
public class BitmapLruCache extends LruCache<String, Bitmap> implements ImageCache {
    private static final int DEFAULT_CACHE_SIZE = (int) (Runtime.getRuntime().maxMemory() / 1024) / 8;

    public BitmapLruCache() {
        this(DEFAULT_CACHE_SIZE);
    }

    public BitmapLruCache(int maxSize) {
        super(maxSize);
    }

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

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

    @Override
    protected int sizeOf(String key, Bitmap value) {
        return value == null ? 0 : value.getRowBytes() * value.getHeight() / 1024;
    }
}
ListView recycles Bitmap without noticing in lrucache

ListView recycles Bitmap without noticing in lrucache


By : user2677914
Date : March 29 2020, 07:55 AM
it fixes the issue
When I scroll down the first time, the new Image views appear with a previous bitmap for an instant before the task finishes setting up the correct bitmap (even though I draw a resource Bitmap on the adapter's getView) I don't understand why.
code :
if (!getItem(position).paintCover(lViewHolder.getImageView())) {
       Log.i(TAG,"getView: task");
       new GalleryItemTask(position, lViewHolder)
               .executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, null);
}
else
{
   //what should the adapter do if paintCover is true?
}
Implementing LruCache for caching bitmap images

Implementing LruCache for caching bitmap images


By : Barett Mims
Date : March 29 2020, 07:55 AM
wish helps you To calculate the in-memory size of the bitmap prior to API level 12 you may use this code:
code :
int bitmapSize = bitmap.getRowBytes() * bitmap.getHeight();
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
protected int sizeOf(String key, Bitmap bitmap) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
        return bitmap.getByteCount();
    } else {
        return bitmap.getRowBytes() * bitmap.getHeight();
    }
}
Using LruCache: Is cache attatched to a LruCache instance?

Using LruCache: Is cache attatched to a LruCache instance?


By : glcafuni
Date : March 29 2020, 07:55 AM
I hope this helps . An LruCache object just stores references to objects in memory. As soon as you lose the reference to the LruCache, the LruCache object and all of the objects within that cache are garbage collected. There's nothing stored to disk.
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