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    <p>If the zxing barcode scanner is installed in the mobile, its very easy:</p> <pre><code>Intent intent = new Intent( "com.google.zxing.client.android.SCAN"); intent.putExtra("SCAN_MODE", "PRODUCT_MODE");//for Qr code, its "QR_CODE_MODE" instead of "PRODUCT_MODE" intent.putExtra("SAVE_HISTORY", false);//this stops saving ur barcode in barcode scanner app's history startActivityForResult(intent, 0); </code></pre> <p>and in <code>OnActivityResult</code>:</p> <pre><code>@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if (requestCode == 0) { if (resultCode == RESULT_OK) { String contents = data.getStringExtra("SCAN_RESULT"); //this is the result } else if (resultCode == RESULT_CANCELED) { // Handle cancel } </code></pre> <p>If its not installed: u can put this code in try-catch block and catching the exception, u can do this:</p> <pre><code>Uri marketUri = Uri .parse("market://details?id=com.google.zxing.client.android"); Intent marketIntent = new Intent(Intent.ACTION_VIEW, marketUri); startActivity(marketIntent); </code></pre> <p>So it redirects the app to android market and ur app continues running once if the barcode scanner is installed.</p> <p>If u dont want to use the other app in ur app, U have to download zxing library and try using the classes from core.jar file(it is created using apache ant). Follow this tutorial to do that: <code>http://code.google.com/p/zxing/wiki/GettingStarted</code></p>
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    1. POHow to execute BarCode scanner from ZXing sources on Java, Android?
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    1. USSeshu Vinay
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