android - 我如何通过蓝牙打印机打印线性布局上的表单数据集

Question

<分区>

Answer 1

__________打印方法____________

private void bluetoothSendData(String text) {
        if (LogConfig.tracking)
            Log.i("bluetoothSendData()", text);
        try {
            mBTSocket.getOutputStream().write(decodeText(text));
        } catch (IOException e) {
            if (LogConfig.enable)
                Log.e(TAG, "Send data error: ", e);
        }

    }

_________如果您需要打印格式化文本，请使用____________

private byte[] decodeText(String text) throws CharacterCodingException,
            UnsupportedEncodingException {
        String encoding = "your supported encoding";
        Charset charset = Charset.forName(encoding);
        CharsetDecoder decoder = charset.newDecoder();
        CharsetEncoder encoder = charset.newEncoder();
        ByteBuffer bbuf = encoder.encode(CharBuffer.wrap(text));
        CharBuffer cbuf = decoder.decode(bbuf);
        String s = cbuf.toString();
        return s.getBytes(encoding);
    }


BluetoothSocket mBTSocket = null;

________________initMethod()_________________

mBTAdapter = BluetoothAdapter.getDefaultAdapter();
        mBTDevice = getBTDeviceRegisteredPrinter();

---

____________连接方法_______________

mBTSocket = mBTDevice
                            .createRfcommSocketToServiceRecord(MY_UUID_SECURE);
mBTSocket.connect();

使用下面的代码获取设备

private BluetoothDevice getBTDeviceRegisteredPrinter() {

        BluetoothDevice BTDevice = null;    
        if (mBTAdapter.isEnabled()) {
            Set<BluetoothDevice> pairedDevices = mBTAdapter.getBondedDevices();
            if (pairedDevices.size() > 0) {
                // Loop through paired devices
                for (BluetoothDevice device : pairedDevices) {
                    if (getRegisteredPrinter().equals("Your Printer")) {
                        if (device.getName().startsWith("see paired name")) {
                            if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
                                BTDevice = device;
                                mBTAdapter.cancelDiscovery();
                            }
                        }
                    }
                }
            }
        }

        return BTDevice;

    }