Saving an image on the bank

I want to get the imageview image saved in the database and make the last saved image come back when I open the app

code to transform the image into a byte

    ByteArrayOutputStream saida = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG,100,saida);
    imagem = saida.toByteArray();

bitmap byte

    bitmap = BitmapFactory.decodeByteArray(imagem, 0, imagem.length);
    imageView.setImageBitmap(bitmap);

I have a test with two imageview, I get the image I transform into a byte, then a byte to the image and I put it in imageview 2, but when I try to do this, the image does not appear