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Zxing

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Zxing

  1. 1. ZXing<br />Multi-format 1D/2D barcode image processing library with clients for Android, Java<br />This is Harry’s learning material about barcode, which he knew nothing about before<br />
  2. 2. It’s all about QR code<br />First created in Japan, 1994. <br />used for tracking parts in vehicle manufacturing<br />Usage nowadays<br />commercial tracking<br />mobile tagging<br />Role – information carrier<br />Text based info, including URL, contact info etc.<br />
  3. 3. Mobile Tagging<br />URL <br />Contact information<br />SMS<br />Text<br />Even MORE to come…..<br />NOTE: Microsoft Tag is more creative, it is even colorful tagging!!!<br />
  4. 4. Barcode Scanner(from ZXing team)<br />Project hosting <br />http://code.google.com/p/zxing/<br />How to use<br />Call via Intent(if barcode scanner is installed) -- easy<br />Call via Intent(if not installed, link to the app’s URL to Android Market)--easy<br />Embedding in your own app(applicable but not easy)<br />
  5. 5. Consistent UI <br />There are 2 types of UI, which need to be modified in order to have consistent UI<br />Scan UI<br />ViewFinderView.java<br />Result UI<br />Should be a customized UI<br />
  6. 6. Embedding call - 1<br />public final Button.OnClickListenermScanQRCode = new Button.OnClickListener() {<br />public void onClick(View v) {<br /> Intent intent = new Intent("com.google.zxing.client.android.SCAN");<br />intent.putExtra("SCAN_MODE", "QR_CODE_MODE");<br />startActivityForResult(intent, 0);<br />}<br />};<br />
  7. 7. Embedding call - 2<br />@Override<br />public void onActivityResult(intrequestCode, intresultCode, Intent intent) {<br />if (requestCode == 0) {<br />if (resultCode == RESULT_OK) {<br /> String contents = intent.getStringExtra("SCAN_RESULT");<br /> String format = intent.getStringExtra("SCAN_RESULT_FORMAT");<br />showDialog(R.string.result_succeeded, "Format: " + format + " Contents: " + contents);<br /> } else if (resultCode == RESULT_CANCELED) {<br />showDialog(R.string.result_failed, getString(R.string.result_failed_why));<br />}<br />}<br />}<br />
  8. 8. more to come<br />I am still diving in the code. I try and clear it up. Will give more info soon.<br />

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