Java 如何使用蓝牙打印机设备从android打印图片
我正在开发android蓝牙设备,我想创建一个应用程序,通过蓝牙打印机打印来自android手机的内容。我已经做了编码和测试的文本打印,但我找不到正确的方法来打印图片,例如美国标志。。。。我所做的是将位图转换为ByteArrayOutputStream,但我不知道如何完成。。。 我使用的是android SDK: 将位图转换为ByteArrayOutputStream的代码如下:Java 如何使用蓝牙打印机设备从android打印图片,java,android,printing,bitmap,bluetooth,Java,Android,Printing,Bitmap,Bluetooth,我正在开发android蓝牙设备,我想创建一个应用程序,通过蓝牙打印机打印来自android手机的内容。我已经做了编码和测试的文本打印,但我找不到正确的方法来打印图片,例如美国标志。。。。我所做的是将位图转换为ByteArrayOutputStream,但我不知道如何完成。。。 我使用的是android SDK: 将位图转换为ByteArrayOutputStream的代码如下: private int mWidth;// private int mHeight;// private S
private int mWidth;//
private int mHeight;//
private String mStatus;//
private BitSet dots;//
private ByteArrayOutputStream mService;//
public void print_image()
{
MainActivity m = new MainActivity();
Bitmap bmp=BitmapFactory.decodeResource(m.getResources(), R.drawable.ic_launcher);
//ByteArrayOutputStream stream=new ByteArrayOutputStream();
//bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
//byte[] image=stream.toByteArray();
//Bitmap bmp = BitmapFactory.decodeFile(file);
convertBitmap(bmp);
try {
mService.write(PrinterCommands.SET_LINE_SPACING_24);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int offset = 0;
while (offset < bmp.getHeight()) {
try {
mService.write(PrinterCommands.SELECT_BIT_IMAGE_MODE);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for (int x = 0; x < bmp.getWidth(); ++x) {
for (int k = 0; k < 3; ++k) {
byte slice = 0;
for (int b = 0; b < 8; ++b) {
int y = (((offset / 8) + k) * 8) + b;
int i = (y * bmp.getWidth()) + x;
boolean v = false;
if (i < dots.length()) {
v = dots.get(i);
}
slice |= (byte) ((v ? 1 : 0) << (7 - b));
}
mService.write(slice);
}
}
offset += 24;
try {
mService.write(PrinterCommands.FEED_LINE);
mService.write(PrinterCommands.FEED_LINE);
mService.write(PrinterCommands.FEED_LINE);
mService.write(PrinterCommands.FEED_LINE);
mService.write(PrinterCommands.FEED_LINE);
mService.write(PrinterCommands.FEED_LINE);
mService.write(PrinterCommands.SET_LINE_SPACING_30);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public String convertBitmap(Bitmap inputBitmap) {
mWidth = inputBitmap.getWidth();
mHeight = inputBitmap.getHeight();
convertArgbToGrayscale(inputBitmap, mWidth, mHeight);
mStatus = "ok";
return mStatus;
}
private void convertArgbToGrayscale(Bitmap bmpOriginal, int width,
int height) {
int pixel;
int k = 0;
int B = 0, G = 0, R = 0;
dots = new BitSet();
for (int x = 0; x < height; x++) {
for (int y = 0; y < width; y++) {
// get one pixel color
pixel = bmpOriginal.getPixel(y, x);
// retrieve color of all channels
R = Color.red(pixel);
G = Color.green(pixel);
B = Color.blue(pixel);
// take conversion up to one single value by calculating
// pixel intensity.
R = G = B = (int) (0.299 * R + 0.587 * G + 0.114 * B);
// set bit into bitset, by calculating the pixel's luma
if (R < 55) {
dots.set(k);//this is the bitset that i'm printing
}
k++;
}
}
}
让我们假设上面的代码工作成功,那么我们将如何完成呢
我在谷歌上搜索了很多,但在互联网上没有任何解决方案。。。谁能帮帮我吗
提前谢谢,如果我的英语不好,我很抱歉
public class PrinterCommands {
public static final byte[] INIT = {27, 64};
public static byte[] FEED_LINE = {10};
public static byte[] SELECT_FONT_A = {27, 33, 0};
public static byte[] SET_BAR_CODE_HEIGHT = {29, 104, 100};
public static byte[] PRINT_BAR_CODE_1 = {29, 107, 2};
public static byte[] SEND_NULL_BYTE = {0x00};
public static byte[] SELECT_PRINT_SHEET = {0x1B, 0x63, 0x30, 0x02};
public static byte[] FEED_PAPER_AND_CUT = {0x1D, 0x56, 66, 0x00};
public static byte[] SELECT_CYRILLIC_CHARACTER_CODE_TABLE = {0x1B, 0x74, 0x11};
//public static byte[] SELECT_BIT_IMAGE_MODE = {0x1B, 0x2A, 33, -128, 0};
public static byte[] SELECT_BIT_IMAGE_MODE = {0x1B, 0x2A, 33, (byte) 255, 3};
public static byte[] SET_LINE_SPACING_24 = {0x1B, 0x33, 24};
public static byte[] SET_LINE_SPACING_30 = {0x1B, 0x33, 30};
public static byte[] TRANSMIT_DLE_PRINTER_STATUS = {0x10, 0x04, 0x01};
public static byte[] TRANSMIT_DLE_OFFLINE_PRINTER_STATUS = {0x10, 0x04, 0x02};
public static byte[] TRANSMIT_DLE_ERROR_STATUS = {0x10, 0x04, 0x03};
public static byte[] TRANSMIT_DLE_ROLL_PAPER_SENSOR_STATUS = {0x10, 0x04, 0x04};
}