1. Blackberry and Andriod QR codes
Cosc 5/4730
Blackberry and Andriod
QR codes

2. What is QR code?
A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional code) first designed for the automotive industry.
More recently, the system has become popular outside of the industry due to its fast readability and large storage capacity compared to traditional UPC barcodes.
The code consists of black modules arranged in a square pattern on a white background.
The information encoded can be made up of four standardized kinds ("modes") of data (numeric, alphanumeric, byte/binary, Kanji), or by supported extensions virtually any kind of data
From Wikipedia,

3. Anatomy of a QR code

4. QR app’s
The Main api for QR codes comes from the ZXing (“Zebra Crossing”).
Which is part of google.com code
Blackberry supports the APIs directly in the com.google.zxing, since API 6.0.0
Android does not have any built-in API (for it’s own code…). Instead you need to install the barcode Scanner apk (in the market and on the zxing website)
Version 3.72 (as of Jan 25, 2012)

5. Creating QR codes You can use XYing website to create QR code

6. QR code
Blackberry

7. QR codes Uses the com.google.zxing packages.
Allows you to create QR very quickly and easily.
You can also scan for QR codes
Uses the camera and viewfinder, so some what complex if you don’t already under the camera calls.

8. Creating/displaying the QR code.
First delcare a QRCode variable
QRCode qrCode = new QRCode();
This encodes the text with a low level (%7) of error correction
Encoder.encode(barcodeTextField.getText(), ErrorCorrectionLevel.L, qrCode);
Where barcodeTextField is a the text to encode in the QRcode
From there we get the actual data matrix and convert it into a bitmap
ByteMatrix barcode = qrCode.getMatrix();
Bitmap bitmap = BarcodeBitmap.createBitmap(barcode, BARCODE_WIDTH);
Where BARCODE_WIDTH is a constant 300.
Now display the barcode in a bitmapField
barcodeField.setBitmap(bitmap);

9. Scanning a QR code. Requires use of the camera.
So if you’ll need to back to get camera lecture for a lot of the information about what is going on with the viewfinder.
We create a BarcodeScanner and BarcodeDecoder
The decoder is feed to the scanner as well as “hints”
We provide this information to the viewfinder as well to find the QR code automatically.
IE the camera will focus, etc and “take the picture”.

10. Coding it up.
First we create a hashtable to hold all of the hints that we can give the API about how we want to scan a barcode to improve speed and accuracy.
Hashtable hints = new Hashtable();
The first thing going in is a list of formats. We could look for more than one at a time, but it's much slower.
Vector formats = new Vector();
formats.addElement(BarcodeFormat.QR_CODE);
This is where we would add other formats to look for.
hints.put(DecodeHintType.POSSIBLE_FORMATS, formats);
We will also use the "TRY_HARDER" flag to make sure we get an accurate scan
hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
We create a new decoder using those hints
BarcodeDecoder decoder = new BarcodeDecoder(hints);

11. Coding it up. (2)
Finally we can create the actual scanner with a decoder and a listener that will handle the data stored in the barcode. We put that in our view screen to handle the display.
scanner = new BarcodeScanner(decoder, new MyBarcodeDecoderListener() );
barcodeScreen = new MyBarcodeScannerViewScreen(scanner);
Once we get here, all the barcode scanning infrastructure should be set up, so all we have to do is start the scan and display the viewfinder
scanner.startScan();
theApp.pushScreen(barcodeScreen); //the viewfinder screen

12. BarcodeDecoderListener
The listener is call when a the QR code has been decoded with the text string.
class MyBarcodeDecoderListener implements BarcodeDecoderListener {
public void barcodeDecoded(final String rawText) {
//close the viewfinder
//and decide what to do with the rawText
//like launch a browser if it’s an }

13. You can use BB qrDemo code
Which is located here:
The res/img has a demo barcode img file for the simulator

14. QR code
android

15. First
You will need to install the BarcodeScannerX.apk into the simulator
And download it first of course.
Adb.exe install BarcodeScanner3.72.apk
We’ll use intents to call it.
It should noted, you can also import their code and then it looks a lot like the Blackberry code.
We are not covering this

16. Encoding. Create the intent and call the activity.
So for a simple one, text encoding.
Intent intent = new Intent( "com.google.zxing.client.android.ENCODE");
intent.putExtra("ENCODE_TYPE", “TEXT_TYPE”);
intent.putExtra("ENCODE_DATA", “
startActivity(intent);
The encoded QR will show on the screen.

17. Scanning Again, create an intent, but we’ll need a result.
Intent intent = new Intent( "com.google.zxing.client.android.SCAN");
intent.putExtra("com.google.zxing.client.android.SCAN.SCAN_MODE", "QR_CODE_MODE");
startActivityForResult(intent, 0);

18. Scanning (2) Add the onActivityResult method
if (requestCode == 0) { //code used to call Scanner.
if (resultCode == RESULT_OK) {
String contents = intent.getStringExtra("SCAN_RESULT");
String format = intent.getStringExtra( "SCAN_RESULT_FORMAT");
// Handle successful scan
} else if (resultCode == RESULT_CANCELED) {
// Handle cancel }

19. All well and good, EXCEPT
What happens if the BarcodeScanner app is not installed?
FORCE CLOSE!
But there is code to handle it.
xying has two java class you can add to your project.
IntentIntegrator.java and IntentResult.java

20. IntentIntegrator It checks to make sure the app is installed.
If not, then it asks the user to get it from the Market.
Now you code doesn’t force close.

21. Create with the Integrator
We call the integrator code, we included in the project
IntentIntegrator integrator = new IntentIntegrator( qrDemoActivity.this);
Where qrDemoActivity is the name of your activity.
integrator.shareText(“ );
Again shows the qrCode or an error message if there is a problem with the text.

22. Scan with the Integrator
Same idea as creating, but again we need a result
IntentIntegrator integrator = new IntentIntegrator(qrDemoActivity.this);
Where qrDemoActivity is the name of your activity.
integrator.initiateScan( IntentIntegrator.QR_CODE_TYPES);
And wait for the result in onActivityResult

23. Scan with the Integrator (2)
In the onActivityResult method
//code to handle the intentintegrator, then
IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
if (scanResult != null) {
// handle scan result
String contents = scanResult.getContents();
if (contents != null) {
logthis("[II] Scan result is "+ scanResult.toString());
} else {
logthis("[II] Scan failed or canceled"); }
} //handle the other result codes as needed.

24. You can use Android qrDemo code
Which is located here:

25. refrences http://zxing.appspot.com/generator

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