Question

I need to load ~150 JPEG images into ArrayList for playing an animation.

If I load them like that

ByteArrayOutputStream stream = new ByteArrayOutputStream();
BitmapFactory.decodeResource(getResources(), R.drawable.y1).compress(Bitmap.CompressFormat.JPEG, 80, stream);
byeArr.add( stream.toByteArray() );

it can take up to ~10 seconds for 150 images, so maybe there is a way to speed it up? Can I somehow store this images in resources or in assets already as byte[] or something?

Thanks

Answer 1

You can use the method below to get the raw data from a resource. You don’t need to decode then compress again.

byte[] getBytesFromResource(final int res) {
    byte[] buffer = null;
    InputStream input = null;

    try {
        input = getResources().openRawResource(res);
        buffer = new byte[input.available()];
        if (input.read(buffer, 0, buffer.length) != buffer.length) {
            buffer = null;
        }
    } catch (IOException e) {
        buffer = null;
    } finally {
        if (input != null) {
            try {
                input.close();
            } catch (IOException e) {}
        }
    }

    return buffer;
}