Converting bitmap to byteArray android

Question

I have a bitmap that I want to send to the server by encoding it to base64 but I do not want to compress the image in either png or jpeg.

Now what I was previously doing was.

ByteArrayOutputStream byteArrayBitmapStream = new ByteArrayOutputStream(); bitmapPicture.compress(Bitmap.CompressFormat.PNG, COMPRESSION_QUALITY, byteArrayBitmapStream); byte[] b = byteArrayBitmapStream.toByteArray(); //then simple encoding to base64 and off to server encodedImage = Base64.encodeToString(b, Base64.NO_WRAP); 

Now I just dont want to use any compression nor any format plain simple byte[] from bitmap that I can encode and send to the server.

Any pointers?

Answer 1

You can use copyPixelsToBuffer() to move the pixel data to a Buffer, or you can use getPixels() and then convert the integers to bytes with bit-shifting.

copyPixelsToBuffer() is probably what you'll want to use, so here is an example on how you can use it:

//b is the Bitmap  //calculate how many bytes our image consists of. int bytes = b.getByteCount(); //or we can calculate bytes this way. Use a different value than 4 if you don't use 32bit images. //int bytes = b.getWidth()*b.getHeight()*4;   ByteBuffer buffer = ByteBuffer.allocate(bytes); //Create a new buffer b.copyPixelsToBuffer(buffer); //Move the byte data to the buffer  byte[] array = buffer.array(); //Get the underlying array containing the data. 

Answer 2

instead of the following line in @jave answer:

int bytes = b.getByteCount(); 

Use the following line and function:

int bytes = byteSizeOf(b);  protected int byteSizeOf(Bitmap data) { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) {     return data.getRowBytes() * data.getHeight(); } else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {     return data.getByteCount(); } else {       return data.getAllocationByteCount(); }