Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import android.graphics.Bitmap; public class Main { public static byte[] getImageByte(Bitmap bitmap) { // imageView.setDrawingCacheEnabled(true); // Bitmap bitMap = imageView.getDrawingCache(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); byte[] imageBytes = baos.toByteArray(); return imageBytes; } }