我正在创建一个Android应用程序，其中应用程序在通过蓝牙连接的打印机上打印数据。 我已通过蓝牙成功连接打印机，应用程序也可以打印纯文本和图像。但是我无法打印HTML文本。
要打印纯文本，我使用以下代码
byte[] cmd = new byte[3];
cmd[0] = 0x1b;
cmd[1] = 0x21;
if((lang.compareTo("en")) == 0){
cmd[2] |= 0x10;
//mService.write(cmd); //±¶¿í¡¢±¶¸ßģʽ
mService.sendMessage("Testing!\n\n", "GBK");
cmd[2] &= 0xEF;
//mService.write(cmd); //È¡Ïû±¶¸ß¡¢±¶¿íģʽ
msg = " Hi! This is the plain text.\n\n"
" Printer is made in China\n\n";
mService.sendMessage(msg,"GBK");
}
要打印图像，我使用以下代码
byte[] sendData = null;
PrintPic pg = new PrintPic();
pg.initCanvas(384);
pg.initPaint();
pg.drawImage(0, 0, "/mnt/sdcard/myimage.jpg");
sendData = pg.printDraw();
mService.write(sendData);
有人可以帮我编写代码来打印HTML文本吗？
以下是活动的完整代码（如果有人想要的话）
public class PrintDemo extends Activity {
Button btnSearch;
Button btnSendDraw;
Button btnSend;
Button btnClose;
EditText edtContext;
EditText edtPrint;
private static final int REQUEST_ENABLE_BT = 2;
BluetoothService mService = null;
BluetoothDevice con_dev = null;
private static final int REQUEST_CONNECT_DEVICE = 1; //»ñÈ¡É豸ÏûÏ¢
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mService = new BluetoothService(this, mHandler);
//À¶ÑÀ²»¿ÉÓÃÍ˳ö³ÌÐò
if( mService.isAvailable() == false ){
Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show();
finish();
}
}
@Override
public void onStart() {
super.onStart();
//À¶ÑÀδ´ò¿ª£¬´ò¿ªÀ¶ÑÀ
if( mService.isBTopen() == false)
{
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
try {
btnSendDraw = (Button) this.findViewById(R.id.btn_test);
btnSendDraw.setOnClickListener(new ClickEvent());
btnSearch = (Button) this.findViewById(R.id.btnSearch);
btnSearch.setOnClickListener(new ClickEvent());
btnSend = (Button) this.findViewById(R.id.btnSend);
btnSend.setOnClickListener(new ClickEvent());
btnClose = (Button) this.findViewById(R.id.btnClose);
btnClose.setOnClickListener(new ClickEvent());
edtContext = (EditText) findViewById(R.id.txt_content);
btnClose.setEnabled(false);
btnSend.setEnabled(false);
btnSendDraw.setEnabled(false);
} catch (Exception ex) {
Log.e("³ö´íÐÅÏ¢",ex.getMessage());
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mService != null)
mService.stop();
mService = null;
}
class ClickEvent implements View.OnClickListener {
public void onClick(View v) {
if (v == btnSearch) {
Intent serverIntent = new Intent(PrintDemo.this,DeviceListActivity.class); //ÔËÐÐÁíÍâÒ»¸öÀàµÄ»î¶¯
startActivityForResult(serverIntent,REQUEST_CONNECT_DEVICE);
} else if (v == btnSend) {
String msg = edtContext.getText().toString();
if( msg.length() > 0 ){
mService.sendMessage(msg+"\n", "GBK");
}
} else if (v == btnClose) {
mService.stop();
} else if (v == btnSendDraw) {
String msg = "";
String lang = getString(R.string.strLang);
//printImage();
byte[] cmd = new byte[3];
cmd[0] = 0x1b;
cmd[1] = 0x21;
if((lang.compareTo("en")) == 0){
cmd[2] |= 0x10;
//mService.write(cmd); //±¶¿í¡¢±¶¸ßģʽ
mService.sendMessage("Congratulations!\n\n", "GBK");
cmd[2] &= 0xEF;
//mService.write(cmd); //È¡Ïû±¶¸ß¡¢±¶¿íģʽ
msg = " If you can read this information, you have correctly installed your printer.\n\n"
+" Product Info.\n\n" +
" Model:X330\n" +
" System Version: 2.1\n" +
" Bluetooth Specification: 2.0\n" +
" Physical Connection: USB 2.0\n" +
" Made in China\n\n";
mService.sendMessage(msg,"GBK");
}else if((lang.compareTo("ch")) == 0){
cmd[2] |= 0x10;
//mService.write(cmd); //±¶¿í¡¢±¶¸ßģʽ
mService.sendMessage("¹§Ï²£¡\n\n", "GBK");
cmd[2] &= 0xEF;
//mService.write(cmd); //È¡Ïû±¶¸ß¡¢±¶¿íģʽ
msg = " Èç¹ûÄú¿ÉÒÔ¶ÁÈ¡Õâ¸öÐÅÏ¢,\n"
" ÖйúÖÆÔì\n\n";
mService.sendMessage(msg,"GBK");
}
}
}
}
/**
* ´´½¨Ò»¸öHandlerʵÀý£¬ÓÃÓÚ½ÓÊÕBluetoothServiceÀà·µ»Ø»ØÀ´µÄÏûÏ¢
*/
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case BluetoothService.MESSAGE_STATE_CHANGE:
switch (msg.arg1) {
case BluetoothService.STATE_CONNECTED: //ÒÑÁ¬½Ó
Toast.makeText(getApplicationContext(), "Connect successful",
Toast.LENGTH_SHORT).show();
btnClose.setEnabled(true);
btnSend.setEnabled(true);
btnSendDraw.setEnabled(true);
break;
case BluetoothService.STATE_CONNECTING: //ÕýÔÚÁ¬½Ó
Log.d("À¶ÑÀµ÷ÊÔ","ÕýÔÚÁ¬½Ó.....");
break;
case BluetoothService.STATE_LISTEN: //¼àÌýÁ¬½ÓµÄµ½À´
case BluetoothService.STATE_NONE:
Log.d("À¶ÑÀµ÷ÊÔ","µÈ´ýÁ¬½Ó.....");
break;
}
break;
case BluetoothService.MESSAGE_CONNECTION_LOST: //À¶ÑÀÒѶϿªÁ¬½Ó
Toast.makeText(getApplicationContext(), "Device connection was lost",
Toast.LENGTH_SHORT).show();
btnClose.setEnabled(false);
btnSend.setEnabled(false);
btnSendDraw.setEnabled(false);
break;
case BluetoothService.MESSAGE_UNABLE_CONNECT: //ÎÞ·¨Á¬½ÓÉ豸
Toast.makeText(getApplicationContext(), "Unable to connect device",
Toast.LENGTH_SHORT).show();
break;
}
}
};
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_ENABLE_BT: //ÇëÇó´ò¿ªÀ¶ÑÀ
if (resultCode == Activity.RESULT_OK) { //À¶ÑÀÒѾ´ò¿ª
Toast.makeText(this, "Bluetooth open successful", Toast.LENGTH_LONG).show();
} else { //Óû§²»ÔÊÐí´ò¿ªÀ¶ÑÀ
finish();
}
break;
case REQUEST_CONNECT_DEVICE: //ÇëÇóÁ¬½ÓijһÀ¶ÑÀÉ豸
if (resultCode == Activity.RESULT_OK) { //Òѵã»÷ËÑË÷ÁбíÖеÄij¸öÉ豸Ïî
String address = data.getExtras()
.getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS); //»ñÈ¡ÁбíÏîÖÐÉ豸µÄmacµØÖ·
con_dev = mService.getDevByMac(address);
mService.connect(con_dev);
}
break;
}
}
//´òӡͼÐÎ
@SuppressLint("SdCardPath")
private void printImage() {
byte[] sendData = null;
PrintPic pg = new PrintPic();
pg.initCanvas(384);
pg.initPaint();
pg.drawImage(0, 0, "/mnt/sdcard/icon.jpg");
sendData = pg.printDraw();
mService.write(sendData); //´òÓ¡byteÁ÷Êý¾Ý
}
}