Java tutorial
//package com.java2s; //License from project: Apache License import android.graphics.Bitmap; import android.graphics.Bitmap.CompressFormat; import java.io.ByteArrayOutputStream; public class Main { public static byte[] bitmapToByteArray(Bitmap bmp) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bmp.compress(CompressFormat.JPEG, 60, stream); byte[] byteArray = stream.toByteArray(); return byteArray; } }