Convert Image into byte[] then byte[] into string and vice versa

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http://stackoverflow.com – Maybe this question is a duplicate but I couldn't get a solution for the last three days. I saved images into an SQLite database and I want to fetch these images and show in a Customize listView. For that I have to pass an Image into an ArrayList as a string. Then how to convert that image=>byte[]=>string and vice versa? (HowTos)