Bitmap recycle with largeHeap enabled

You should probably have a look at Displaying Bitmaps Efficiently which includes several ways to handle large Bitmaps Efficiently,

• Loading Large Bitmaps Efficiently

BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(getResources(), R.id.myimage, options);
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;

This will give you the size of the image before downloading and on that basis you can check the size of your device and scale it using calculateInSampleSize() and decodeSampledBitmapFromResource() given in the explanation of docs.

Calculating how much we need to scale the image,

• First way

if (imageHeight > reqHeight || imageWidth > reqWidth) {
      if (imageWidth > imageHeight ) {
          inSampleSize = Math.round((float)imageHeight / (float)reqHeight);
      } else {
          inSampleSize = Math.round((float)imageWidth / (float)reqWidth);
      }
    }

• Second way

int inSampleSize = Math.min(imageWidth / reqWidth,imageHeight / reqHeight);

The you can set the inSampleSize,

 options.inSampleSize = inSampleSize;

Then finally make sure you call,

options.inJustDecodeBounds = false;

else it will return Bitmap as null

• Processing Bitmaps Off the UI Thread

  Processing Bitmap on UI thread is never safe so its always better to do that in a background thread and update UI after the process is completed.

• Caching Bitmaps

  LruCache is available from API 12 but if you are interested it using below versions it is also available in Support Library too. So caching of Images should be done efficiently using that. Also you can use DiskLruCache for images where you want then to remain for longer period in extenal storage.

• Clearing the Cache

  Sometimes when your image size is too large even caching the image causes OutOfMemoryError so in that case its better to clear the cache when your image is out of the scope or not used for longer period so that other images can be cached.

  I had created a demo example for the same, you can download from here