Android : DiskLruCache.get() in loop returns null on last key

I'm loading images in gridView from DiskLruCache.

The DiskLruCache.get() loop last one was always return null (but it was).

for (int i = 0; i < mInfoArray.size(); i++) {
        String imageKey = String.valueOf(mInfoArray.get(i).rs_id);
        Bitmap cacheBmp = mDiskCache.getBitmapFromDiskCache(imageKey);

1. added diskcache key(ex.)
   
   
   
   • 2130837620.0
   
   
   • 2130837621.0
   
   
   • journal
   
   
   
   

The last "2130837621.0" cacheBmp value is always "null".

If it's not a bug but my mistake maybe someone would help me with issue?

Thanks!