BitmapFactory.decode method returning null - android

I'm using this code to get the bitmap placed inside the ImageView]
private Bitmap getBitmap(ImageView imageView) {
imageView.setDrawingCacheEnabled(true);
imageView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
imageView.layout(0, 0, imageView.getMeasuredWidth(), imageView.getMeasuredHeight());
imageView.buildDrawingCache(true);
Bitmap b = Bitmap.createBitmap(imageView.getDrawingCache());
imageView.setDrawingCacheEnabled(false);
return b;
}});
and this code to save it to the database in the form of a byte array
public byte[] convertToBytes(Bitmap image) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
Log.d("IMAGE BYTE IS ", imageBytes.toString());
return imageBytes;
}
Decoding the image using this code to redisplay it returns null
public Bitmap convertToImage(byte[] bytes) {
ByteArrayInputStream imageStream = new ByteArrayInputStream(bytes);
return BitmapFactory.decodeStream(imageStream);
}
I have logged the byte array before inserting and after retrieving and they both return the same values. Where did it go wrong?

Turns out I was only saving the memory reference of the stream to the SQLite. Using ContentValue to insert the byte array to sqlite did the trick.

Related

Converting Image into Base64 String Android

This is my code. I am converting my Gallery image into base 64 string. this base 64 string is saving through this code in database but when i decode that string that gives me mime error. why this is happening?
if (resultCode == Activity.RESULT_OK) {
// Picasso.get().load(data.getData()).into(ivprofile);
filePath = data.getData().getPath();
Glide.with(this).load(data.getData()).into(ivprofile);
ivprofile.getDrawingCache();
Bitmap bitmap = ivprofile.getDrawingCache();
ByteArrayOutputStream stream=new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] image=stream.toByteArray();
img_str = Base64.encodeToString(image, Base64.DEFAULT);
}
this is what i am getting after saving
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follow the reference code in order to encode and decode image using base64 in android.
//encode image to base64 string
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.logo);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);
//decode base64 string to image
imageBytes = Base64.decode(imageString, Base64.DEFAULT);
Bitmap decodedImage = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
image.setImageBitmap(decodedImage);
You need to enable drawing cache before you can get bitmap from imageview. Use below code for it.
imageView.setDrawingCacheEnabled(true);
imageView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
imageView.layout(0, 0,
imageView.getMeasuredWidth(), imageView.getMeasuredHeight());
imageView.buildDrawingCache(true);
Bitmap bitmap = Bitmap.createBitmap(imageView.getDrawingCache());
imageView.setDrawingCacheEnabled(false);
or you can simply use this.
Bitmap bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();
You can do that in the following way:
Saving to db
byte[] data = text.getBytes("UTF-8");
String base64 = Base64.encodeToString(data, Base64.DEFAULT);
Receiving from db
byte[] data = Base64.decode(base64, Base64.DEFAULT);
String text = new String(data, "UTF-8");
For more information, check Base64

ByteArray to Bitmap gives null

I am trying to convert byte array to bitmap to display an image in android app. But while converting it is returning the null value. I have used the following code:
operations = new DataBaseOperations();
byte image[] = operations.fetchimage(); // gets byte array from the database
BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeByteArray(image, 0, image.length, options);
Herebitmap is null, why?
Try this link. It will solve your problem
How to convert byte array to Bitmap
or just check this code
Bitmap bitmap = BitmapFactory.decodeFile("/path/images.jpg");
ByteArrayOutputStream blob = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.PNG, 0 /*ignored for PNG*/, blob);
byte[] bitmapdata = blob.toByteArray();
//if bitmapdata is the byte array then getting bitmap goes like this
Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata , 0, bitmapdata .length);
Returns The decoded bitmap, or null if the image could not be decode.

How to convert Bitmap to string without losing quality

I've converted an bitmap image into string to save it:
............
Bitmap photo = extras.getParcelable("data");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
String encodedImage = Base64.encodeToString(b, Base64.DEFAULT);
Then I retrieve the bitmap from string to set an activity's background just like that:
byte[] temp = Base64.decode(encodedImage, Base64.DEFAULT);
Options options = new BitmapFactory.Options();
options.inScaled = false;
Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0,
temp.length, options);
Drawable d = new BitmapDrawable(getResources(), bitmap);
getWindow().setBackgroundDrawable(d);
Everything works fine but the image quality reduces tremendously. I know it is because photo.compress(Bitmap.CompressFormat.JPEG, 100, baos); as I am compressing this image(though in best compressing resolution). So how can I do this without compressing the image? I have also tried the following code but it returns nothing
.......
Bitmap photo = extras.getParcelable("data");
int bytes = photo.getWidth() * photo.getHeight() * 4;
ByteBuffer buffer = ByteBuffer.allocate(bytes);
photo.copyPixelsToBuffer(buffer);
byte[] b = buffer.array();
String encodedImage = Base64.encodeToString(b, Base64.DEFAULT);
Also I am using sharedPreference to save the image. I thought of sqlite or internal storage also, but in both case compressing is needed as I found in internet

Get Blob image and convert that image into Bitmap image

I am getting image from database in blob format. i want to convert it into Bitmap image.the code i used to convert bitmap to Blob is put below.but please tell me how to reverse it.???
ByteArrayOutputStream boas = new ByteArrayOutputStream();
btmap.compress(Bitmap.CompressFormat.JPEG, 100, boas ); //bm is the bitmap object
byte[] byteArrayImage = boas .toByteArray();
String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);
This will work
byte[] byteArray = DBcursor.getBlob(columnIndex);
Bitmap bm = BitmapFactory.decodeByteArray(byteArray, 0 ,byteArray.length);
You can use this simple static function, It is super easy to implement and reuse :)
public static Bitmap getBitmapFromBytes(byte[] bytes) {
if (bytes != null) {
return BitmapFactory.decodeByteArray(bytes, 0 ,bytes.length);
}
return null;
}

Strange issue with Bitmap transparency while saving as BLOB

Trapped in a strange issue with Bitmap transparency, I have images with me and convert it in Blob and stored it in local Database.
I have this image
after storing it as Blob and fetching it, then image background gets filled
Any idea why this is happening, and to get through with it.
Thanks.
This is how i convert to Byte and stored to database
public byte[] BitmapToByte(Bitmap bitmap)
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); //bm is the bitmap object
byte[] b = baos.toByteArray();
return b;
}
This is how i m fetching Blob as Bitmap from database
mImageView.setImageBitmap(BitmapFactory.decodeByteArray(blob, 0, blob.length)); //blob by cursor
Got the solution, it is cause of using Android's Thumbnail folder(which creates additional preview and me passing thumbnail cursor to the image adapter). When i fetch image directly from the Database it is coming transparent.
My problem fixed just change the
Bitmap.CompressFormat.JPG to Bitmap.CompressFormat.PNG
public byte[] BitmapToByte(Bitmap bitmap)
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//bitmap.compress(Bitmap.CompressFormat.JPG, 100, baos); //origin
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); //fixed
byte[] b = baos.toByteArray();
return b;
}

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