I'm trying to get the binary form of an image in android to send to a server, but it's not working. When I printed the bytes being created it returns this : [B#cfc2978
public Byte[] getImageBytes(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPG, 50, baos);
byte[] imageBytes = baos.toByteArray();
System.out.println(imageBytes);
return imageBytes;
}
Can Anyone help me find out why this is happening and how to fix it? To clarify, i need to send the binary form of the image to the server to be processed. The testing was done through the emulator.
Related
I am trying to pass an image from java to flutter. The image is in bitmap in java so I first try to convert it to bytes[] using:
on java side:
int byteCount = transferredImage.getAllocationByteCount(); // transferredImage is the bitmap
ByteBuffer buffer = ByteBuffer.allocate(byteCount); //Create a new buffer
transferredImage.copyPixelsToBuffer(buffer);
byte[] myByte = buffer.array();
Then on flutter side I read the image as Uint8List and create an img.Image object from it:
img.Image styleImage = img.Image.fromBytes(
imgWidth,
imgHeight,
transferredBytes,
);
This works, without causing any errors but the image displayed using Image.memory(img.encodeJpg(styleImage)) always has a blue tint. The bitmap on java side is fine but when converted to bytes[] and displayed in flutter it has a blue tint..
So I assumed some important information may have been dropped during conversion to bytes using my above method, I then convert the image to an image format and then transfer the bytes:
at java side:
ByteArrayOutputStream baos = new ByteArrayOutputStream();
transferredImage.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte bytes []= baos.toByteArray();
on flutter side:
img.Image styleImage = img.Image.fromBytes(
imgWidth,
imgHeight,
transferredBytes,
);
But this does not work and creates an error:
RangeError (index): Index out of range: index should be less than
321512: 322560
If possible, I would prefer to have my first attempt work as it is really fast, so is there any way I can get this to work ?
Thanks
When i make upload of a image in Android to the server (C #) it generates an error converting the image to byte Array, this happens with some images which is very strange because this error is not always generated, that is, depending the image is correctly converted or not.
The conversion code:
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmapPhoto.compress(Bitmap.CompressFormat.JPEG, 50, stream);
final byte[] img_byte = stream.toByteArray();
final String imageString = Base64.encodeToString(img_byte, Base64.DEFAULT);
When receiving in C# I make the following conversion in the string, generating a byte Array and then for the MemoryStream.
byte[] novaFoto = Convert.FromBase64String(NovaFoto.FotoString);
using (MemoryStream stream = new MemoryStream(novaFoto))
{
Image image = Image.FromStream(stream);
}
depending at the image the error appears in either Convert.FromBase64String or Image.FromStream.
Can anyone help me with this? If you have another method i like this.Thanks!!
Hello I am working with android image processing via base 64 encoding and decoding.I need to send an encoded base 64 string to server as a string . When I tried it in android side , I can able to decode it into original image.and my decoding and encoding are as follows
public void base(Bitmap bitmap)
{
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream .toByteArray();
String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);
toimag(encoded);
String a=encoded.replaceAll("\\s+","");
Log.i("strrr",a);
}
public void toimag(String encodedImage)
{
byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
logo.setImageBitmap(decodedByte);
}
But I cant able to get the actual image using http://www.askapache.com/online-tools/base64-image-converter/ . It show only a part of my actual image. This is my base 64 string
iVBORw0KGgoAAAANSUhEUgAAAyAAAAJYCAIAAAAVFBUnAAAAA3NCSVQICAjb4U/gAAAgAElEQVR4
nKS9WbMsyXEm9n0emVVnu/vSDTTQQAMgOCMQHIDkiGM2Gs1QkkmU5kG/QX9QZjKZzYNMD3oZDheJ
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QgJKAwFAxTCpkEaDAFCjKdTMbDZDHCoASUABoAhJkvktRKT96e/yP0UEANXMf4HCIiIiMpGUKkZC
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How can I resolve this issue ? Is there any problem with this encoded string ? Please help. Thanks in advance :)
It appears you are cutting and pasting from the logcat. logcat truncates long messages, so you should not rely on it for copying large pieces of data. You should save the base64 string out to a file and then try your validation using that file.
For Encode image to Base64
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();
String imageEncode = Base64.encodeToString(b,
Base64.DEFAULT);
For decode image
byte[] decodedByte = Base64.decode(imageEncode, 0);
Bitmap newBitmap = BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
logo.setImageBitmap(newBitmap);
I develop a custom messenger application which sends message from client(Android) to another client(web). My problem is when I send image file, I encoded it to Base64 string and then send it to another client. When the recipient client is Android, the app successfully decoded the Base64 String to bitmap image. But when the recipient client is web app, the web application failed to decode and display it using :
<img id="img" src="data:image/jpeg;base64,3iVBORw0KGgoAAAANSU...">
My Java encode/decode method
public static Bitmap base64StringToBitmap(String base64) {
byte[] bytes = Base64.decode(base64, Base64.URL_SAFE);
return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
}
public static String bitmapToBase64String(Bitmap bmp, Bitmap.CompressFormat format, int quality) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(format, quality, baos);
byte[] bytes = baos.toByteArray();
return Base64.encodeToString(bytes, Base64.URL_SAFE);
}
I've tried to change the encoding method to Base64.DEFAULT, but still the Base64 String cannot be displayed in HTML using data:image/jpeg;base64. Is there any differences between Android Base64 string and Base64 string used to display image in HTML? Please suggest me the solution. Thanks
EDIT :
This is the base64 string example generated from my Android application, with padding. I failed to display it on html/web, although it can be displayed fine on Android :
3iVBORw0KGgoAAAANSUhEUgAAAF8AAABfCAYAAACOTBv1AAAABHNCSVQICAgIfAhkiAAAChtJREFU
eJzdnVtIVN8ex3/+R00r/6OWl6Kr0EOF51SioaHY3fB0ke4EmZn2kBGYRQ8VGEKnhNQ6BOXpxV6i
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I had a similar issue where I wanted to convert an Android generated BASE64 string to Binary with Javascript and atob function was keep giving me errors. My first guess was like yours to use URL_SAFE instead of DEFAULT, but none of them worked, then I figure it out that I need to use Base64.NO_WRAP method to get it working.
I tested Base64.NO_WRAP and displaying inline image and IT WORKED!!!!
Hope this save you some nerves, because I did had some till I figure it out how to do it.
So to give the nice answer, change: return Base64.encodeToString(bytes, Base64.URL_SAFE); to this: return Base64.encodeToString(bytes, Base64.NO_WRAP);
E
can you try with this for me it's working fine one two change only Base64.DEFAULT insted of URL_SAFE and image tag alt. just check it.
<img height=700px src='data:image/jpg;base64,"+encodeString+"' alt='Embeded Image'/>
public static String bitmapToBase64String(Bitmap bmp, Bitmap.CompressFormat format, int quality) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(format, quality, baos);
byte[] bytes = baos.toByteArray();
return Base64.encodeToString(bytes, Base64.DEFAULT);
}
I'm trying to upload an image to servlet from my android client. The code executes well, however when I try to open the sended image, it seems corrupted. ¿Do you know why?
The code is the next:
Android client:
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, stream);//compress to which format you want.
byte [] byte_arr = stream.toByteArray();
String image_str = Base64.encodeToString(byte_arr, 0);
image_str is what I'm sending to servlet:
byte[] imageByteArray = Base64.decode(message);
FileOutputStream f = new FileOutputStream("/path/IMG/pruebaaaa.jpg");
f.write(imageByteArray);
f.close();
Thank you in advance!
Try putting in flush() just above close() as below.
f.write(imageByteArray);
f.flush();
f.close();