In my app I include both ZSDK_ANDROID_API.JAR and ZSDK_ANDROID_BTLE.JAR. Then, when pairing I detect whether the printer is Classic BT or BTLE and store that in a variable:
public void findMacAddr(String nfcData) {
int index = 0;
// The Bluetooth MAC Address from a Bluetooth Low Energy (BLE) printer will be identified by "&mBL".
// A Classic Bluetooth address will be identified by "&mB".
index = nfcData.indexOf("&mBL="); // See if this is a BLE connection.
if (index == -1)
{
printerType = "Bluetooth";
index = nfcData.indexOf("&mB="); // Not BLE, so it must be Classic Bluetooth
index += 4;
}
else
{
printerType = "BluetoothLE";
index += 5;
}
nfcMacAddress = nfcData.substring(index, index + 12); // Creates a substring containing only the MAC Address information
index = nfcData.indexOf("&s"); // Index is set to the Serial Number identifier
nfcSerialName = nfcData.substring(index + 3, index + 17); // Creates a substring containg only the Serial Number
index = nfcData.indexOf("&mW=");
nfcWifiAddress = nfcData.substring(index + 4, index + 16); // Creates a substring containing only the WIFI MAC Address information
index = nfcData.indexOf("&c=");
printerModel = nfcData.substring(index + 3, index + 7);
}
And then, when I go to print, I select the proper method to call:
public boolean connectAndPrint(String data, Context context) {
boolean result = false;
Connection conn = null;
if (printerType.equals("Bluetooth"))
{
conn = new BluetoothConnection(nfcMacAddress);
}
else if (printerType.equals("BluetoothLE"))
{
conn = new BluetoothLeConnection(nfcMacAddress, context);
}
if (conn == null) return false;
try {
conn.open();
conn.write(data.getBytes());
// Make sure the data got to the printer before closing the connection
Thread.sleep(500);
result = true;
} catch (Exception e) {
// Handle communications error here.
e.printStackTrace();
result = false;
} finally {
// Close the connection to release resources.
if (null != conn) {
try {
conn.close();
} catch (ConnectionException e) {
e.printStackTrace();
}
}
}
return result;
}
HOWEVER.... I find that I sometimes (and have not spent the time to investigate why) need to perform these lines BEFORE calling connectAndPrint():
BluetoothConnection conn = new BluetoothConnection(printer.getAddress());
printer.connectDevice(conn);
…..
printer.connectAndPrint(labelData);
I hope this helps.

Hi dear i m same devices and i got it same problem you how to solved if you solved that is problem if possible share it with me your solutions
thank you best redards
salih hanifeoglu

Is the ZSDK_ANDROID_BTLE_API.jar (library) still available? I cannot find it anywhere in the Zebra downloads. Also, ZSDK_ANDROID_API.jar (library) only has class files for Bluetooth and NOT Bluetooth low energy like the library I am attempting to locate.

Thank you

Hi Colin,
Your code looks fine.  I'm guessing you either have Bluetooth disabled on the printer, or the printer is BTLE only.  If you want me to check, reply with the full part number printed on the underside of the printer.  You can enable Bluetooth using the Printer Setup Utilities | Zebra app on PC or Android.  If the printer is BTLE, there is a separate Android BTLE library in the latest Link-OS SDK.

Hi Colin,

By the Zebra sample app, do you mean the one packaged with the Link-OS SDK? The Zebra demo app is throwing this error as well? When you are trying to use the demo, is your device already paired to the printer?