How to convert Image into byte[] in Android

Question

I want to save image in sqlite. In this method I have got image path into string. My Question is How to convert it into byte[] format.

if (resultCode == RESULT_OK) {
// we need to update the gallery by starting MediaSanner service.
mScanner = new MediaScannerConnection(ImagePreviewActivity.this,new MediaScannerConnection.MediaScannerConnectionClient() {

                        public void onMediaScannerConnected() {
                                mScanner.scanFile(imageUri.getPath(), null );
                        }           

                        public void onScanCompleted(String path, Uri uri) {
                            mScanner.disconnect();
                            if (path.equals(imageUri.getPath())) {
                                 photoPath=imageUri.getPath();
                                        ImagePreviewActivity.this.runOnUiThread(new Runnable() {
                                        public void run() {
                                            capture_photo = (ImageView) findViewById(R.id.caturePhoto);
                                            Bitmap myBitmap = BitmapFactory.decodeFile(photoPath);
                                            capture_photo.setImageBitmap(myBitmap);

                                    }
                                });
                                mScanner.disconnect();
                            }
                        }
                    });
                    mScanner.connect();

this can hep you : http://stackoverflow.com/questions/10831151/how-to-store-and-retrieve-images-in-android-sqlite-database-and-display-them-on — Zied R., Mar 01 '14 at 16:01
possible duplicate of [Convert image to byte array and viceversa](http://stackoverflow.com/questions/15805146/convert-image-to-byte-array-and-viceversa) — Devrim, Mar 01 '14 at 16:18
I would just store the compressed image data directly from the file http://stackoverflow.com/questions/858980/file-to-byte-in-java - not the decoded pixel data since that a) saves space b) is simpler to load as `Bitmap` (via `BitmapFactory`), i.e. dump file you get via `photoPath` into the database without decoding it. — zapl, Mar 01 '14 at 16:20

Abhishek Agarwal · Answer 1 · 2014-03-01T16:39:00.620

9

First convert ImagePath to Bitmap

       Bitmap src=BitmapFactory.decodeFile(imagePath);

Convert bitmap into byte array using this code:

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        src.compress(Bitmap.CompressFormat.PNG, 100, baos);
        data = baos.toByteArray();

After your question in comment

To show byte array into imageview use these lines of code:

   Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata , 0, bitmapdata .length);

    imageView.setImageBitmap(bitmap);

To show imagePath into imageView you can use

                 Bitmap src=BitmapFactory.decodeFile(imagePath);
                 imageView.setImageBitmap(bitmap);

edited Mar 01 '14 at 16:39

answered Mar 01 '14 at 16:04

Abhishek Agarwal

1,907
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Thanks, Can you tell me how Convert byte array into bitmap and then convert Bitmap to Image – Ash Mar 01 '14 at 16:22
you can directly save byte array into image – Abhishek Agarwal Mar 01 '14 at 16:30
Actually I want to fetch Image from Sqlite and show it in imageview. So, In what method we have to use for it – Ash Mar 01 '14 at 16:32
thanks again, but my main problem is I want to read from sqlite"while(cursor.moveToNext()){ cimages.add(new CImage((cursor.getBlob(cursor.getColumnIndex(CAMERA_PHOTO))))); } how can use method to read it from sqlite ? – Ash Mar 01 '14 at 18:04

score 2 · Answer 2 · answered Mar 01 '14 at 15:57

2

Like this:

ByteArrayOutputStream stream = new ByteArrayOutputStream();
myBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();

answered Mar 01 '14 at 15:57

Rolf ツ

8,611
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score 0 · Answer 3 · answered Mar 01 '14 at 16:00

this function convert an image into array byte[]:

 public static byte[] getBitmapAsByteArray(Bitmap bitmap) {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    bitmap.compress(CompressFormat.PNG, 0, outputStream);       
    return outputStream.toByteArray();
}

How to convert Image into byte[] in Android

3 Answers3

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