This is my code to convert image file into byte array.
public String GetQRCode() throws FileNotFoundException, IOException {
/*
* In this function the first part shows how to convert an image file to
* byte array. The second part of the code shows how to change byte array
* back to a image.
*/
AssetManager mgr = mAppView.getContext().getAssets();
InputStream in = mgr.open("www/Siemens_QR.jpg");
InputStreamReader isr = new InputStreamReader(in);
char[] buf = new char[20];
isr.read(buf, 0, 20);
isr.close();
// byte[] bytes = bos.toByteArray();
String abc = buf.toString();
return abc;
}
Here I am converting an image file into byte array. I am able to do this. But when try to read this image file using the path ("sdcard/Download/Siemens_QR.jpg") stored in emulator then I am getting VM aborting error. Please suggest me the correct path to read the image file stored in the emulator.
if you have jpg image stored on SD card then get the file path and try to convert the image to byte using following method...
Bitmap bitmap = BitmapFactory.decodeFile(file path);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 60, baos);
byte[] byte_img_data = baos.toByteArray();
Related
#/**
* This method is used to convert encoded base 64 image string into inputStream without saving it into file system
* #param : encodedBase64Image - Contains encoded base 64 image string
* #return :InputStream
*
*/#
encoded base 64 image string into inputStream without saving it into file system
InputStream getInputStream(final String encodedBase64Image) {
long mediaId
// create a buffered image
BufferedImage image = null
byte[] imageByte;
imageByte = EncodingGroovyMethods.decodeBase64(encodedBase64Image) // Coverting encoded image string into byte array
ByteArrayInputStream bis = new ByteArrayInputStream(imageByte)
image = ImageIO.read(bis)
RenderedImage rImage = (RenderedImage) image; // forming rendered image
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(rImage, "jpg", os); // JPEG Image is formed in OutputStream
InputStream fis = new ByteArrayInputStream(os.toByteArray()); /* OutputStream into Inputstream */
return InputStream
}
encoded base 64 image string into inputStream without saving it into file system
I have some standard code to share an image in my Android app. The image exists on the storage and I provide an URI to the image. This all works fine.
However, this requires the WRITE_EXTERNAL_STORAGE permission. Is there a way I can share an image without the need of this permission, for example, to not save the image to storage, but specifying a memory stream or byte array?
Thanks!
You can convert an image file to a byte array with the following code, which I taken from an answer to a similar question: How to convert image into byte array and byte array to base64 String in android?
String filepath = "/sdcard/temp.png";
File imagefile = new File(filepath);
FileInputStream fis = null;
try {
fis = new FileInputStream(imagefile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
Bitmap bm = BitmapFactory.decodeStream(fis);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100 , baos);
byte[] b = baos.toByteArray();
Optional step to encode in Base64
encImage = Base64.encodeToString(b, Base64.DEFAULT);
I am trying to convert Image to Byte Array and save it in database. Image to Byte Conversion and bytes to Image Conversion using ImageIO Method works completely fine before saving it into database. But when i retrieve bytes from Database ImageIO returns null.
FileInputStream fis = new FileInputStream(picturePath);
BufferedImage image = ImageIO.read(new File(picturePath));
BufferedImage img = Scalr.resize(image, Scalr.Mode.FIT_EXACT, 124, 133, Scalr.OP_ANTIALIAS);
ByteArrayOutputStream ByteStream = new ByteArrayOutputStream();
ImageIO.write(img, "jpg", ByteStream);
ByteStream.flush();
byte[] imageBytes = ByteStream.toByteArray();
ByteStream.close();
PersonImage = imageBytes;
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(PersonImage);
BufferedImage ImageForBox = ImageIO.read((InputStream)byteArrayInputStream);
PersonImageBox.setIcon(new ImageIcon((Image)ImageForBox));
Above code is what I do before saving picture bytes in DB. I resize the Image then convert it into bytes and then convert other way around and show it in JLabel, it works fine. But when I retrieve bytes from database and use the same code i.e.
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(PersonImage); // PersonImage are bytes from dB.
BufferedImage ImageForBox = ImageIO.read((InputStream)byteArrayInputStream);
PersonImageBox.setIcon(new ImageIcon((Image)ImageForBox));
In this case ImageIO returns null. Please help.
I have a .net ASMX webservice that I'm consuming using the ksoap2 library. In the service, I first save the user image and later retrieve it. However, once I retrieve it, the byte array is intact, but the BitmapFactory is unable to decode it and returns a null.
To convert to byte array:
Bitmap viewBitmap = Bitmap.createBitmap(imageView.getWidth(),
imageView.getHeight(), Bitmap.Config.ARGB_8888);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
viewBitmap.compress(CompressFormat.PNG, 0 /* ignored for PNG */, bos);
byte[] bitmapdata = bos.toByteArray();
The webservice accepts the bytearray in the byte[] format.
To convert the array into bitmap:
byte[] blob= info.get(Main.KEY_THUMB_BYTES).getBytes();
Bitmap bmp=BitmapFactory.decodeByteArray(blob,0,blob.length); // Return null :(
imageView.setImageBitmap(bmp);
From partial-analysis, it appears that the byte array does not change. Then why does decoding return null? Is there a better to save an image and pass it through a webservice? I didn't analyze the whole byte array, so I'm guessing it might've changed a bit.
Any thoughts? Many thanks!
UPDATE:
I just tried converting the byte[] to string using:
Base64.encodeToString( bos.toByteArray(), Base64.DEFAULT);
And decode using:
byte[] blob= Base64.decode(info.get(Main.KEY_THUMB_BYTES));
Now all i get is a White picture. I'm not sure what's wrong here. Please help.
UPDATE:
I'm storing this image inside of a database, in a column of type varchar(max). Should I be storing this byte array string inside a different sql data type? I'm not too experienced with SQL, so I used varchar because it did not convert text to unicode, which I thought might be good for thie byte array.
Thanks!
convert your byte arrays to Base64 that is a string and easy to transfer:
public static String bitmapToBase64(Bitmap bitmap) {
byte[] bitmapdata = bitmapToByteArray(bitmap);
return Base64.encodeBytes(bitmapdata);
}
public static byte[] bitmapToByteArray(Bitmap bitmap) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.PNG, 0 /* ignored for PNG */, bos);
byte[] bitmapdata = bos.toByteArray();
return bitmapdata;
}
and
public static Bitmap base64ToBitmap(String strBase64) throws IOException {
byte[] bitmapdata = Base64.decode(strBase64);
Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata, 0,
bitmapdata.length);
return bitmap;
}
also you can do it not only on image files but also on every file types:
public static String fileToBase64(String path) throws IOException {
byte[] bytes = fileToByteArray(path);
return Base64.encodeBytes(bytes);
}
public static byte[] fileToByteArray(String path) throws IOException {
File imagefile = new File(path);
byte[] data = new byte[(int) imagefile.length()];
FileInputStream fis = new FileInputStream(imagefile);
fis.read(data);
fis.close();
return data;
}
public static void base64ToFile(String path, String strBase64)
throws IOException {
byte[] bytes = Base64.decode(strBase64);
byteArrayTofile(path, bytes);
}
public static void byteArrayTofile(String path, byte[] bytes)
throws IOException {
File imagefile = new File(path);
File dir = new File(imagefile.getParent());
if (!dir.exists()) {
dir.mkdirs();
}
FileOutputStream fos = new FileOutputStream(imagefile);
fos.write(bytes);
fos.close();
}
I am trying to convert an image to byte array and converting back byte array to image in Android Emulator.
First part is working fine but the second part is not creating the image file in Android emulator.
Please suggest me if there is any correction in my second part of the code.
Following is my code.
public String GetQRCode() throws FileNotFoundException, IOException {
/*
* In this function the first part shows how to convert an image file to
* byte array. The second part of the code shows how to change byte array
* back to an image.
*/
Bitmap bitmap = BitmapFactory.decodeFile("sdcard/Download/QR.jpg");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 60, baos);
byte[] byte_img_data = baos.toByteArray();
byte[] buf = new byte[200];
// Second Part: Convert byte array back to an image
Bitmap bitmap2 = BitmapFactory.decodeByteArray(byte_img_data, 0, 200);
ByteArrayOutputStream img= new ByteArrayOutputStream();
Bitmap imageFile= BitmapFactory.decodeFile("sdcard/Download/QR3.jpg");
String abc = buf.toString();
return abc;
}
your call to BitmapFactory.decodeByteArray(..) - this method returns a Bitmap object, but you're not assigning it to anything. You also need to change the call to pass in the actual length of byte_img_data, rather then 200.
Bitmap bitmap2 = BitmapFactory.decodeByteArray(byte_img_data, 0, byte_img_data.length);
However, whether decodeByteArray(..) can handle compressed streams, i don't know