QR code reading with camera - Android

Question

I am currently researching to build an alarm clock application in Android. I am utterly and completely new to programming with QR codes. I know nothing about it. But right now, I want to find out the feasibility of creating an application with QR code functionality. (I have two weeks to build this)

My first question is: would I have to handle the camera myself in the code i.e. do I have to fire it up and then close it and then process the QR image?

2nd Q: How would I create the QR code and then when I scan it, how does it know it scanned the right one? I want to print one, place it in the kitchen or bathroom and then when the alarm goes off, I have to scan the code before the alarm turns off.

Answer 1

Just donwload the barcode Scanner (QR-Code Scanner) apk file.

http://www.aapktop.com/tag/barcode-scanner-apk http://www.4shared.com/android/2lwrpeHZ/Barcode_Scanner.html http://code.google.com/p/zxing/downloads/detail?name=BarcodeScanner4.31.apk

Install it your device (not on emulator).

now follow these steps.

1. create a new project
2. place a button in your XML file.

3. Make a click event for it and call the (QR-Code Scanner) via intent as

           // Scan Handler
   btnScan.setOnClickListener(new OnClickListener() {
   
       @Override
       public void onClick(View v) {
   
           Intent intent = new Intent(
                   "com.google.zxing.client.android.SCAN");
           intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
           startActivityForResult(intent, 0);
       }
   });
   

4. Override the onActivityResult Method as

   // ZXing Result Handler
   
   public void onActivityResult(int requestCode, int resultCode, Intent intent) {
   
   if (requestCode == 0) {
       if (resultCode == RESULT_OK) {
   
   
               contents = intent.getStringExtra("SCAN_RESULT"); // This will contain your scan result
                   String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
   
   
       }
    }
   

Q2

Answer

there are many links out there you can generate the QR-CODE of any type freely. just google it "Online QR CODE generater" http://qrcode.kaywa.com/

Answer 2

In Android this requires about 10 minutes:

https://github.com/zxing/zxing/wiki/Scanning-Via-Intent