Question

I am creating one directory i.e file and storing the bitmap images into that file,now how to convert it into byte array

File myDir = new File(root + "/saved_images");      
                myDir.mkdirs();
                Random generator = new Random();
                int n = 10000;
                n = generator.nextInt(n);
                String fname = "Image-"+ n +".jpg";
                File file = new File (myDir, fname);

                if (file.exists ()) file.delete (); 
                try {
                    FileOutputStream out = new FileOutputStream(file);

                    bmp.compress(Bitmap.CompressFormat.JPEG, 90, out);

                    out.flush();
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();

                }

Answer 1

If you just want to modify your existing code to write the image to a byte array instead of a file, then replace the try block with this code:

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.JPEG, 90, out);
    bytes = out.getBytes();

… where bytes has type byte[], and get rid of the code that generates the filename and deletes the existing file if it exists. Since you writing to a ByteArrayOutputStream, there is not need to call flush() or close() on out. (They won’t do anything.)