Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import android.graphics.Bitmap; public class Main { /** * @brief Converting bitmap to bytes array. * * @param bm [IN] bitmap object * * @return Return converted bytes array */ public static byte[] bitmapToBytes(Bitmap bm) { if (bm == null) { return null; } final ByteArrayOutputStream os = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, os); return os.toByteArray(); } }