Java tutorial
//package com.java2s; //License from project: Apache License import java.io.ByteArrayOutputStream; import android.graphics.Bitmap; public class Main { /** * Bitmap -> byte * * @param bitmap * @return */ public static byte[] bitmapToByte(Bitmap bitmap) { try { ByteArrayOutputStream out = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); bitmap.recycle(); bitmap = null; byte[] array = out.toByteArray(); return array; } catch (Exception e) { e.printStackTrace(); } return null; } }