I want to upload an image to my website via my android app so for that i want to convert my image to Byte[].
i have used the following code but not work for me..
ByteArrayOutputStream bos=new ByteArrayOutputStream();
bm.compress(CompressFormat.JPEG,0, bos);
byte[] data=bos.toByteArray();
So please share with me any other way to convert an Image to Byte[]..
Use ByteBuffer:
array = new byte[w*h*4];
Buffer dst = ByteBuffer.wrap(array);
bmp.copyPixelsToBuffer(dst);
and use array the way you want...
Related
In general vector drawables are compiled, and accessed with their ids in execution time.
My project consist of pulling out images from a server. For now, i'm doing it for png files, but i would try it with vectors ".xml".
I'm able to download those, but i can't parse them in drawable type to show them in views.
How can i do this with a bunch of bytes representing the vectors resources and parsing them to drawables ?
It would be a huge thing for my app since it will be much much lighter, and good for those pixelized pictures.
The inflate method may be helpful, but you could use a third party library:androidsvg. Don't reproduce the wheel if possible.
If you can access the image from the server via url, use Glide to load it to your View. By so doing, you don't have to download the image to your storage before using it in an ImageView. However, if you still want to get the image as a byte array and display it in a view, use the code snippet below...
Bitmap bm = BitmapFactory.decodeFile("/path/to/yourimage.jpg");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
byte[] b = baos.toByteArray(); //This is the image byte
String encodedImage = Base64.encodeToString(b, Base64.DEFAULT); //Encoded string
Furthermore, you can convert the string to a Bitmap and then pass it to your ImageView.
byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
Bitmap bmp= BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
image.setImageBitmap(bmp);
Let me know if you have any question concerning this, I'd be glad to help.
I need to store in Database images chosen from gallery. My firt idea was convert Bitmap to String and store String in Database, but now I am reading other post: saving image clicked from camera or loaded from gallery in database and retrieving it and there is suggested using byte array.
Could someone explain me diffrence, which idea is better? Maybe something else?
I just start, but I would like to write it possibly correctly.
The standard way to store an image as a byte[] in a BLOB field. Another possibility - with some overhead - is to store a Base64-encoded string.
You can use the Base64 Android class:
String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);
You'll have to convert your image into a byte array though. Here's an example:
Bitmap bm = BitmapFactory.decodeFile("/path/to/image.jpg");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
byte[] b = baos.toByteArray();
If you're using an older SDK library (because you want it to work on phones with older versions of the OS) you won't have the Base64 class packaged in (since it just came out in API level 8 aka version 2.2).
Check this article out for a work-around:
http://androidcodemonkey.blogspot.com/2010/03/how-to-base64-encode-decode-android.html
I want to send Image from Android to Server. I decoded image into Base64 String and send it to the server. I use following code to convert Image to String
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.icon);
ByteArrayOutputStream bao = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bao);
byte [] byteArray = bao.toByteArray();
String imageToString=Base64.encodeToString(byteArray,Base64.DEFAULT);
return imageToString;
Now i am unable to convert it back to Image on server side. I tried this
byte[] imageBytes=Base64.decode(imageString);
InputStream in = new ByteArrayInputStream(imageBytes);
BufferedImage bImageFromConvert = ImageIO.read(in);
ImageIO.write(bImageFromConvert, "jpg", new File("D:\\myImage.jpg"));
i am getting Bogus Huffman table definition exception and sometime im = null exception. plz tell me what mistake i am making
Edit: Error Message javax.imageio.IIOException: Bogus Huffman table definition at this line
BufferedImage bImageFromConvert = ImageIO.read(in);
Try this
byte[] imageBytes=Base64.decode(imageString,Base64.NO_WRAP);
InputStream in = new ByteArrayInputStream(imageBytes);
Bitmap b = BitmapFactory.decodeStream(in);
Well there might be multiple issues here. The first one I think is the fact that you convert the image bytes to String (encoding them with whatever default encoding you Android environment has) and the decoding that String back to bytes without ensuring that you use the same text encoding (and thus get the same bytes).
Why not send the bytes directly? Or better yet just upload the file directly via HTTP multi-part form. There's a tutorial on this here:
http://flo.dauran.com/194-android-uploader-une-image-sur-une-serveur-web/
(it's in french, but there's detailed code examples)
I'm uploading JPG image as byte[] but Bitmap strips of EXIF before converting to byte[]. How do I upload raw jpg without converting it to Bitmap?
File imagefile = new File(filepath + "DSC00021.jpg");
FileInputStream fis = new FileInputStream(imagefile);
Bitmap bi = BitmapFactory.decodeStream(fis); // EXIF info lost
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bi.compress(Bitmap.CompressFormat.JPG, 100, baos);
byte[] data = baos.toByteArray();
p.s. I don't want to use any 3rd party library. ExifInterface can only write to file and not streams/byte arrays.
Above code will not work most cases. In case if you want to decode large size image you will get "out of memory error". Decode using bitmpafactory options.
Convert the file to bitmap by
Bitmap bi = BitmapFactory.decode(filepath + "DSC00021.jpg");
You can specify options too, look at API documentation
Or if you want to exchange the meta data from one file to another, sanselan will probably be the best choice. This would be much helpful when you manipulating the image, for example re-size.
The sample code will guide you in a right direction.
In my application I need to call an API Using Http Post to send some information to the web server. So I need to append userid, name, phoneNo and image to the url. I need to convert the image to a byte array and append it to url. I used the following code but it didn't work for me. I just got a byte array like this [B#4055dd90
My code is
Bitmap bitmap1 = ((BitmapDrawable) d).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap1.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] bitmapdata = stream.toByteArray();
Can Some one please help Me ?
Thanks in advance !
Two things:
Images can get pretty big. So, you may be better off using a JPG, as you can compress it (a PNG does not compress). So, you'd use Bitmap.CompressFormat.JPEG and set the amount of compression you want.
When sending in your post, you should encode the byte[] like this: Base64.encodeBase64String( bitmapdata);
Let me know if that works for you. OH, and don't forget to unencode it on your server side.
You can not send the images in the byte array form directly to server. You have to encode it into Base64 String with the help of Base64 Class. Encode Bitmap byte array to Base64 string and send that string to server with the help of HTTPPost method. If you have any doubt then you can comment.