Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import android.graphics.Bitmap; import android.graphics.Bitmap.CompressFormat; import android.util.Base64; public class Main { public static String bitmaptoString(Bitmap bitmap) { String string = null; ByteArrayOutputStream bStream = new ByteArrayOutputStream(); bitmap.compress(CompressFormat.PNG, 50, bStream); byte[] bytes = bStream.toByteArray(); string = Base64.encodeToString(bytes, Base64.DEFAULT); return string; } }