安卓蓝牙打印机Bitmap图片打印：如何将Bitmap数据转换为打印机可识别的格式？

BluetoothDevice device = ... // 获取蓝牙设备
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805f9b34fb")); // 创建BluetoothSocket
socket.connect(); // 建立连接
OutputStream outStream = socket.getOutputStream(); // 获取OutputStream发送数据

Bitmap bitmap = ... // Bitmap对象
ByteArrayOutputStream blob = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 0, blob);
byte[] bitmapData = blob.toByteArray();

// 构造打印指令
String command = String.format("bitmap 0,0,%d,%d,1,", bitmap.getWidth(), bitmap.getHeight());
byte[] commandData = command.getBytes();

// 发送数据
outStream.write(commandData);
outStream.write(bitmapData);

public byte[] bitmapToBytes(Bitmap bitmap) {
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    byte[] imgbuf = new byte[width * height / 8];
    int[] pixels = new int[width * height];
    bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
    // ... (此处省略点阵图转换逻辑，与原文相同) ...
}

public void printBitmap(OutputStream outStream, Bitmap bitmap) throws IOException {
    byte[] imgbuf = bitmapToBytes(bitmap);
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    byte[] command = new byte[] { 0x1D, 0x76, 0x30, 0x00,
            (byte) (width / 8), (byte) (width / 8 >> 8),
            (byte) (height), (byte) (height >> 8) };
    outStream.write(command);
    outStream.write(imgbuf);
    outStream.write(new byte[] { 0x0A, 0x0A });
}

// ... (蓝牙连接代码，与前面相同) ...

printBitmap(outStream, bitmap);