Android : Extract BARCODE/QRCODE data from locally stored(SD Card) images.

Adding demo here to extract BARCODE/QRCODE data from images, images which are stored in local storage or SD card.

• Barcode 
• ZXing
• Image Picker

First of all you need to download ZXing Core library from maven, below is the URL to download latest ZXing core library.

http://mvnrepository.com/artifact/com.google.zxing/core

While creating this post core-3.2.0.jar was latest version. Add this jar in libs folder of your Android project.

We are picking images from gallery using intent and using "bitmap data of image"  to extract barcode/qrcode  result.

Actual code to extract data from bitmap image is given below. 

public Result[] decode(Bitmap imageBitmap) {

MultiFormatReader reader = null;

Map<DecodeHintType, Object> hints = new EnumMap<DecodeHintType, Object>(DecodeHintType.class);

/* There are different format to create barcode and qrcode, 

* while extracting we are adding all the possible format for better result. 

*/

hints.put(DecodeHintType.POSSIBLE_FORMATS, EnumSet.allOf(BarcodeFormat.class));

hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);

reader = new MultiFormatReader();

reader.setHints(hints);

int width = imageBitmap.getWidth();

int height = imageBitmap.getHeight();

int[] pixels = new int[width * height];

imageBitmap.getPixels(pixels, 0, width, 0, 0, width, height);

RGBLuminanceSource source = new RGBLuminanceSource(width, height, pixels);

BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

MultipleBarcodeReader multiReader = new GenericMultipleBarcodeReader(reader);

Result[] theResults = null;

try {

/* decode multiple is used so that if multiple barcode is present in single image we can get result for all of them. 

*/

theResults = multiReader.decodeMultiple(bitmap, hints);

} catch (NotFoundException e1) {

e1.printStackTrace();

}

return theResults;

}

You can download demo code from below url:

https://drive.google.com/file/d/0B0mH97AUwQqhNnB0MGVneUtiQTA/view?usp=sharing

Android: ListView with Filterable List and Animation

Adding demo here to create ListView with Filterable List.

• ListView
• Filterable Interface
• Animation ListView

For adding filterable ListView we have to implement Filterable interface in our Adapter class.

And define getFilter() method of this interface.

For Example:

@Override

public Filter getFilter() {

return new Filter() {

@SuppressWarnings("unchecked")

@Override

protected void publishResults(CharSequence constraint, FilterResults results) {

/*

*Notify listview to populate new list after filtering

*/

notifyDataSetChanged();

}

/* (non-Javadoc)

* constraint : String to filter result

* return  FilterResults to populate on listview

*/

@Override

protected FilterResults performFiltering(CharSequence constraint) {

/*

*Here we will get string to filter result from current list.

*We can create new result data to populate on listview. 

*/

                  return resultData;

}

};

}

For adding animation into ListView we have to create animation xml and put it into anim folder inside res directory 

Now we can add this animation into ListView using below code:

listView.setAnimation(AnimationUtils.loadAnimation(LauncherActivity.this, R.anim.alpha));

For detail download example and see inline comment.

You can download demo code from below url:

https://drive.google.com/file/d/0B0mH97AUwQqhQWtET01jWEpaOFU/view?usp=sharing