Convert Bitmap to ByteArray and vice versa

Question

In my android application i want to convert image ,taken from camera, to byte array and convert back to bitmap to view in a image view. I can do it easily through Bitmap.compress. But i want to do it without Bitmap.compress. The problem is that i am getting white lines (poor images every time(lines) )

                        Bitmap hello;    //image coming from camera
                        ByteBuffer buffer = ByteBuffer.allocate(hello.getByteCount()); 
                        hello.copyPixelsToBuffer(buffer);
                        byte[] bytes1 = buffer.array();
                        byte [] Bits = new byte[bytes1.length*4];
                        int i;
                   for(i=0;i<bytes1.length;i++)
                {
                    Bits[i*4] =
                        Bits[i*4+1] =
                        Bits[i*4+2] = (byte) ~bytes1[i]; //Invert the source bits
                    Bits[i*4+3] = -1;//0xff, that's the alpha.
                }

                Bitmap bmimage = Bitmap.createBitmap( 360,248, Bitmap.Config.ARGB_8888);
                bmimage.copyPixelsFromBuffer(ByteBuffer.wrap(Bits));
                imageView11.setImageBitmap(bmimage);

And is there any significant reason why not to use build-in method `compress` and use your hardcoded approach? — Simon Dorociak, Oct 31 '13 at 09:28

score 1 · Answer 1 · answered Oct 31 '13 at 09:31

Bitmap to byte array:

ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] imageBytes = stream.toByteArray();

or

int bytes = bitmap.getByteCount();
ByteBuffer buffer = ByteBuffer.allocate(bytes); 
bitmap.copyPixelsToBuffer(buffer); 
byte[] array = buffer.array();

byte array to Bitmap:

 InputStream inputStream = new ByteArrayInputStream(bytes);
  BitmapFactory.Options o = new BitmapFactory.Options();
  BitmapFactory.decodeStream(inputStream, null, o);

When I do byte array to Bitmap: which you show I have a nullpointer — Krzysztof Pokrywka, Nov 17 '16 at 10:55

score 0 · Answer 2 · answered Oct 31 '13 at 09:28

0

    ByteArrayOutputStream baos = new ByteArrayOutputStream();  
    bm.compress(Bitmap.CompressFormat.PNG, 100, baos); //bm is the bitmap object   
    byte[] b = baos.toByteArray();
    ///useing following code 
    String encoded = Base64.encodeToString(b, Base64.DEFAULT);

answered Oct 31 '13 at 09:28

Anil Ugale

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You should read question more carefully. He said that he doesn't want to use compress method. – Simon Dorociak Oct 31 '13 at 09:29

Convert Bitmap to ByteArray and vice versa

2 Answers2

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