Java tutorial
//package com.java2s; //License from project: Apache License import android.graphics.Bitmap; import java.io.ByteArrayOutputStream; public class Main { public static byte[] compressBmpToBytes(Bitmap bitmap, int maxSize) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); int options = 100; bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos); while (baos.toByteArray().length / 1024 >= maxSize) { baos.reset(); options -= 5; bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos); } return baos.toByteArray(); } public static byte[] compressBmpToBytes(Bitmap bitmap) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); int options = 100; bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos); return baos.toByteArray(); } }