How to load image thumbnail fast android?

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http://stackoverflow.com – i have an custom gallery in my app for that, i am using my own thumbnail directory. here i am caching the image thumbnail and storing it on my own sdcard directory and showing the thumbnail by loading it from custom image directory its working good, but if it has more pictures it takes so long time to load is there anyway to load it fast and i don't use android's default thumbnail directory. Thank you. (HowTos)