Android平台Nteumm XL-1800A蓝牙打印机如何打印ñ特殊字符？

It sounds like your printer’s stuck in a Chinese character encoding mode, which is why your ñ is getting mapped to a random Chinese character instead of printing correctly. The 0x1C 0x2E command you’re using might be specific to other printer brands (like some Epson models) and doesn’t work for Nteumm devices. Let’s walk through the fixes step by step:

1. Switch the Printer to ISO-8859-1/Latin-1 Character Set #

Most thermal printers default to GB2312/GBK (Chinese) encoding. You need to explicitly send a command to switch it to a character set that supports ñ (like ISO-8859-1). For most Nteumm printers, the standard command to switch character sets is ESC t n, where n is the code for your target encoding.

Add this code before writing your string:

// Switch to ISO-8859-1 character set (code 0x02 - verify with your printer manual)
mOutputStream.write(0x1B); // ESC character
mOutputStream.write(0x74); // 't' command for character set selection
mOutputStream.write(0x02); // Code for ISO-8859-1 (adjust if needed per manual)

2. Remove the Unnecessary Chinese Character Removal Command #

The 0x1C 0x2E command isn’t recognized by your Nteumm printer, so it’s either being ignored or causing unexpected behavior. Delete these lines from your code:

// Remove these lines - they don't work for Nteumm XL-1800A
// mOutputStream.write(0x1C);
// mOutputStream.write(0x2E);

3. Verify String Encoding and Flush the Stream #

Make sure your myString correctly contains the ñ character as a Unicode value, then encode it to ISO-8859-1 as you were doing. Also, add a flush to ensure all data is sent to the printer immediately:

// Encode and write your string
byte[] printData = myString.getBytes("ISO-8859-1");
mOutputStream.write(printData);
mOutputStream.flush(); // Critical to push all data to the printer

4. Confirm Printer Command Details #

If the above doesn’t work, dig up the official Nteumm XL-1800A command manual. The character set code (0x02 in our example) might vary—some printers use 0x00 for USA ASCII, 0x02 for ISO-8859-1, or other values. The manual will list the exact codes and commands for your model.

Putting it all together, your final code should look something like this:

try {
    // Switch to ISO-8859-1 character set
    mOutputStream.write(0x1B);
    mOutputStream.write(0x74);
    mOutputStream.write(0x02);

    // Encode and print the string
    byte[] printData = myString.getBytes("ISO-8859-1");
    mOutputStream.write(printData);
    mOutputStream.flush();
} catch (IOException e) {
    e.printStackTrace();
}

内容的提问来源于stack exchange，提问作者Niuq