Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.util.Base64; import java.io.ByteArrayOutputStream; public class Main { public static String bitmapToString(Bitmap bitmap) { String bitmapString = null; ByteArrayOutputStream bStream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, bStream); byte[] bytes = bStream.toByteArray(); bitmapString = Base64.encodeToString(bytes, Base64.DEFAULT); return bitmapString; } }