com.zebra.sdk.printer.discovery

Class UrlPrinterDiscoverer

Object

com.zebra.sdk.printer.discovery.UrlPrinterDiscoverer

public class UrlPrinterDiscoverer
extends Object

Method Summary

Methods

Modifier and Type	Method and Description
static void	findPrinters(String url, DiscoveryHandler discoveryHandler) This method will search using a combination of discovery methods to find the printer described by the specified URL.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

findPrinters

public static void findPrinters(String url,
                DiscoveryHandler discoveryHandler)
                         throws DiscoveryException

This method will search using a combination of discovery methods to find the printer described by the specified URL. This method will invoke the DiscoveryHandler.foundPrinter(DiscoveredPrinter) method for each interface that the specified printer is found. DiscoveryHandler.discoveryFinished() will be invoked when the discovery is finished and DiscoveryHandler.discoveryError(String) will be invoked when any errors are encountered during discovery. When DiscoveryHandler.discoveryError(String) is invoked, the discovery will be canceled and DiscoveryHandler.discoveryFinished() will not be invoked.

This method will typically be used when reading an NFC tag attached to a Zebra printer. To launch your app when a Zebra NFC tag is read:

• Add the NFC permission to your AndroidManifest.xml
  <uses-permission android:name="android.permission.NFC" />
• Register to listen for Zebra NFC Tag scans in your Activity
  <activity android:name=".MyActivity">
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="http" android:host="zebra.com" android:path="/apps/r/nfc" />
<data android:scheme="http" android:host="www.zebra.com" android:path="/apps/r/nfc" />
</intent-filter>
</activity>
• Handle the NFC scan in your activity
  

  package test.zebra.sdk.printer.discovery.examples;
   
   import android.app.Activity;
   import android.content.Intent;
   import android.nfc.NdefMessage;
   import android.nfc.NfcAdapter;
   import android.os.AsyncTask;
   import android.os.Parcelable;
   
   import com.zebra.sdk.comm.Connection;
   import com.zebra.sdk.printer.ZebraPrinterFactory;
   import com.zebra.sdk.printer.discovery.DiscoveredPrinter;
   import com.zebra.sdk.printer.discovery.DiscoveryException;
   import com.zebra.sdk.printer.discovery.DiscoveryHandler;
   import com.zebra.sdk.printer.discovery.UrlPrinterDiscoverer;
   
   public class UrlPrinterDiscovererExample extends Activity {
   
       protected void onResume() {
           super.onResume();
           processNfcScan(getIntent());
       }
   
       private void processNfcScan(Intent intent) {
           Parcelable[] scannedTags = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
           if (scannedTags != null && scannedTags.length > 0) {
               NdefMessage msg = (NdefMessage) scannedTags[0];
               final String payload = new String(msg.getRecords()[0].getPayload());
               new AsyncTask<Void, Void, Void>() {
                   protected Void doInBackground(Void... params) {
                       try {
                           UrlPrinterDiscoverer.findPrinters(payload, new DiscoveryHandler() {
                               public void foundPrinter(DiscoveredPrinter printer) {
                                   try {
                                       Connection conn = printer.getConnection();
                                       conn.open();
                                       ZebraPrinterFactory.getInstance(conn).printConfigurationLabel();
                                       conn.close();
                                   } catch (Exception e) {
                                       e.printStackTrace();
                                   }
                               }
   
                               public void discoveryFinished() {
                               }
   
                               public void discoveryError(String message) {
                               }
                           });
                       } catch (DiscoveryException e) {
                           e.printStackTrace();
                       }
                       return null;
                   }
               }.execute((Void) null);
               intent.removeExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
           }
       }
   }
   
  

Parameters:

url - The URL describing the targeted printer (Typically, this information is encoded on an NFC tag attached to the printer)
Example:
"http://www.zebra.com/apps/r/nfc?mB=00225832C75F&mW=000000000000&mE=000000000000&c=QN3-AUBA0E01-00&s=XXQLJ112600422&v=0"

discoveryHandler - a DiscoveryHandler instance that is used to handle discovery events (e.g. found a printer, errors, discovery finished).

Throws:

DiscoveryException - if an error occurs while starting the discovery (errors during discovery will be sent via DiscoveryHandler.discoveryError(String)).