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| This service demonstrates how to use a set of Bluetooth APIs to print image or text. The integrity process of Bluetooth print service includes opening Bluetooth, scanning the Bluetooth devices surrounding, pairing with a Bluetooth device and connecting with the device with SPP, and then sending data, which always shows in types of image and text document, and printing the data.
| | {{Migrating|https://smartpossdk.gitbook.io/cloudpossdk/faq/printer/use-terminal-bluetooth-printer}} |
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| == Introduction ==
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| Bluetooth printing is a service, which gets a connection with Bluetooth printer, sends data to the Bluetooth printer through the connection and then printing the data. The connection is built by terminal with SPP(Serial Port Profile).
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| The process of the service:
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| # Open Bluetooth if doesn't open.
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| # Scan and discovery the Bluetooth devices surrounding.
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| # Select and pair the Bluetooth printer.
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| # Send data(a series of ESC command).
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| # Print the data.
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| == Pre-requisites ==
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| # Android SDK 24
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| # Android Build Tools v27.0.0
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| # Android Support Repository
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| # ZXing
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| == Getting Started ==
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| This service uses the gradle build system. To build this project, use the "gradle build" command or use "Import Project" in Android Studio.
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| == Code Snippet ==
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| * Basic API of Bluetooth
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| <syntaxhighlight lang="java" line='line'>
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| public void openBluetooth(Activity activity) {
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| Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
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| activity.startActivityForResult(enableBtIntent, 1);
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| }
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| public void closeBluetooth() {
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| this.bluetoothAdapter.disable();
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| }
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| public void searchDevices() {
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| this.bluetoothAdapter.startDiscovery();
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| }
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| private BroadcastReceiver receiver = new BroadcastReceiver() {
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| ProgressDialog progressDialog = null;
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| @Override
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| public void onReceive(Context context, Intent intent) {
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| String action = intent.getAction();
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| if (BluetoothDevice.ACTION_FOUND.equals(action)) {
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| BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
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| if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
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| addBondDevice(device);
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| } else {
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| addUnbondDevice(device);
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| }
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| } else if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
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| BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
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| String msg = "ACTION_ACL_CONNECTED: " + device.getAddress() + "=" + device.getBondState();
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| Toast.makeText(context, msg, Toast.LENGTH_LONG).show();
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| System.out.println(msg);
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| } else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
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| progressDialog = ProgressDialog.show(context, "pair...","...", true);
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| } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED .equals(action)) {
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| bluetoothAdapter.cancelDiscovery();
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| if (progressDialog != null)
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| progressDialog.dismiss();
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| addUnbondDevicesToListView();
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| addBondDevicesToListView();
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| } else if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
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| int state = bluetoothAdapter.getState();
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| if (state == BluetoothAdapter.STATE_ON) {
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| searchDevices.setEnabled(true);
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| bondDevicesListView.setEnabled(true);
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| unbondDevicesListView.setEnabled(true);
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| } else if (state == BluetoothAdapter.STATE_OFF) {
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| searchDevices.setEnabled(false);
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| bondDevicesListView.setEnabled(false);
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| unbondDevicesListView.setEnabled(false);
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| } else {
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| System.out.println("Bluetooth.STATE: " + state);
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| }
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| } else {
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| System.out.println("Bluetooth.ACTION: " + action);
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| }
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| }
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| };
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| </syntaxhighlight>
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| * Connection with SPP
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| <syntaxhighlight lang="java" line='line'>
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| public boolean connect() {
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| if (!isConnected) {
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| try {
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| bluetoothSocket = createBluetoothSocket();
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| bluetoothSocket.connect();
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| outputStream = bluetoothSocket.getOutputStream();
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| isConnected = bluetoothSocket.isConnected();
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| if (this.bluetoothAdapter.isDiscovering()) {
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| Toast.makeText(this.context, "success to connect",1).show();
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| this.bluetoothAdapter.isDiscovering();
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| }
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| } catch (Exception e) {
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| e.printStackTrace();
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| Toast.makeText(this.context, "fail to connect", 1).show();
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| return false;
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| }
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| }
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| Toast.makeText(this.context, this.device.getName() + "connected",Toast.LENGTH_SHORT).show();
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| return true;
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| }
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| private BluetoothSocket createBluetoothSocket()
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| throws IOException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
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| switch (TYPE_OF_CREATING_SOCKET) {
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| case 0: return device.createRfcommSocketToServiceRecord(uuid);
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| case 1: return device.createInsecureRfcommSocketToServiceRecord(uuid);
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| default:
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| Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
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| return (BluetoothSocket) m.invoke(device, 1);
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| }
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| }
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| </syntaxhighlight>
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| * Send and Print
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| <syntaxhighlight lang="java" line='line'>
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| final byte[][] byteCommands = { { 0x1b, 0x40 }, //printer commands(ESC commands)
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| { 0x1b, 0x4d, 0x00 },
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| { 0x1b, 0x4d, 0x01 },
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| { 0x1d, 0x21, 0x00 },
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| { 0x1d, 0x21, 0x11 },
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| { 0x1b, 0x45, 0x00 },
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| { 0x1b, 0x45, 0x01 },
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| { 0x1b, 0x7b, 0x00 },
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| { 0x1b, 0x7b, 0x01 },
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| { 0x1d, 0x42, 0x00 },
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| { 0x1d, 0x42, 0x01 },
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| { 0x1b, 0x56, 0x00 },
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| { 0x1b, 0x56, 0x01 },
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| public void selectCommand() {
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| new AlertDialog.Builder(context).setTitle("Commands").setItems(items, new DialogInterface.OnClickListener() {
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| @Override
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| public void onClick(DialogInterface dialog, int which) {
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| if (isConnected) {
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| try {
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| outputStream.write(byteCommands[which]);
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| } catch (IOException e) {
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| Toast.makeText(context, "write exception",Toast.LENGTH_SHORT).show();
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| }
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| } else {
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| Toast.makeText(context, "connection is lost",Toast.LENGTH_SHORT).show();
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| }
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| }
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| }).create().show();
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| }
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| public void write(byte[] buff){
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| try {
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| outputStream.write(buff);
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| } catch (IOException e) {
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| }
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| }
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| </syntaxhighlight>
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