将字符串转换为位图以使用热敏打印机进行打印

Question

我使用热敏打印机打印图像，并且效果很好。但是，当我尝试将字符串转换为位图然后打印时，会得到奇怪的打印结果。

这是我将字符串转换为位图的方式

 public Bitmap textAsBitmap(String text, float textSize, int textColor) {
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setTextSize(textSize);
        paint.setColor(textColor);
        paint.setTextAlign(Paint.Align.LEFT);
        float baseline = -paint.ascent(); // ascent() is negative
        int width = (int) (paint.measureText(text) + 0.5f); // round
        int height = (int) (baseline + paint.descent() + 0.5f);
        Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(image);
        canvas.drawText(text, 0, baseline, paint);
        return image;
    }

这是我的打印方法

 public void printPhoto2(Bitmap bmp) {
        try {
            if(bmp!=null){
                byte[] command = Utils.decodeBitmap(bmp);
                mmOutputStream.write(PrinterCommands.ESC_ALIGN_CENTER);
                printText2(command);
            }else{
                Log.e("Print Photo error", "the file isn't exists");
            }
        } catch (Exception e) {
            e.printStackTrace();
            Log.e("PrintTools", "the file isn't exists");
        }
    }
   private void printText2(byte[] msg) {
        try {
            // Print normal text
            mmOutputStream.write(msg);
            printNewLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

我这样打印

 printPhoto2(textAsBitmap(string,30f,R.color.BlackColorOut));

当打印诸如“ Hello world”之类的小文字时，这就是我从打印机获得的信息

这是什么问题？