Convert Arraylist<Object> value in to byte[]

Question

I m trying to get/convert the value of Arraylist in byte[] below is my code

final ArrayList<Object> imglists = new ArrayList<Object>();

this is my arraylist of Objects in this arraylist m storing the values of images in form of bytes

for (int i=0; i<mPlaylistVideos.size();i++) {
    holder.mThumbnailImage.buildDrawingCache();
    Bitmap bitmap= holder.mThumbnailImage.getDrawingCache();
    ByteArrayOutputStream bs = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 50, bs);
    byte[] rough = bs.toByteArray();
    imglists.add(i,rough);
}

I m trying to get the specific value from arraylist and store that in byte[] this is what I was trying to do

byte[] value=imglists.get(2);

I could not find any complete answer to convert Arraylist of Object into byte[] I know Arraylist doesn't support primitive datatype (i-e byte)

Answer 1

What you are looking for is a List of byte[], something like that:

List<byte[]> imglists = new ArrayList<>();

Then you can simply add your byte array to your List using the add(E) method as next:

imglists.add(bs.toByteArray());

You will then be able to access to a given byte array from its index in the List using the method get(int) as you try to achieve:

// Get the 3th element of my list
byte[] value = imglists.get(2);