我一直在努力寻找解决方案，但却无法解决。所以我在Android上开发POS应用程序，我需要使用蓝牙打印机打印销售/购买收据。
打印本身工作正常，但每当我打电话给 mBluetoothSocket.connect（）时，它会打印出 CONNECT“8869-XX-XXXXXX”印刷品，我不想要。我不想让连接长时间打开，我希望应用程序只在需要时才能连接。怎么做到这一点？任何帮助家伙。找到下面的代码 提前谢谢。
package anil.com.andoirdbluetoothprint;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.Set;
import java.util.UUID;
import android.app.Activity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity implements Runnable {
protected static final String TAG = "TAG";
private static final int REQUEST_CONNECT_DEVICE = 1;
private static final int REQUEST_ENABLE_BT = 2;
Button mScan, mPrint, mDisc;
BluetoothAdapter mBluetoothAdapter;
private UUID applicationUUID = UUID
.fromString("00001101-0000-1000-8000-00805F9B34FB");
private ProgressDialog mBluetoothConnectProgressDialog;
private BluetoothSocket mBluetoothSocket;
BluetoothDevice mBluetoothDevice;
@Override
public void onCreate(Bundle mSavedInstanceState) {
super.onCreate(mSavedInstanceState);
setContentView(R.layout.activity_main);
mScan = (Button) findViewById(R.id.Scan);
mScan.setOnClickListener(new View.OnClickListener() {
public void onClick(View mView) {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(MainActivity.this, "Message1", Toast.LENGTH_SHORT).show();
} else {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent,
REQUEST_ENABLE_BT);
} else {
ListPairedDevices();
Intent connectIntent = new Intent(MainActivity.this,
DeviceListActivity.class);
startActivityForResult(connectIntent,
REQUEST_CONNECT_DEVICE);
}
}
}
});
mPrint = (Button) findViewById(R.id.mPrint);
mPrint.setOnClickListener(new View.OnClickListener() {
public void onClick(View mView) {
Thread t = new Thread() {
public void run() {
try {
OutputStream os = mBluetoothSocket
.getOutputStream();
String BILL = "";
// Before this line, it is printing "CONNECT 88C9-XX-XXXXXX"
BILL = "Company Name \n";
BILL = BILL + "Address \n";
BILL = BILL + "--------------- \n";
BILL = BILL + "Item1 : Quantity \n";
BILL = BILL + "Rate : 100 $ \n";
BILL = BILL + "-----------------\n";
BILL = BILL + "Thank You \n";
os.write(BILL.getBytes());
//This is printer specific code you can comment ==== > Start
// Setting height
int gs = 29;
os.write(intToByteArray(gs));
int h = 104;
os.write(intToByteArray(h));
int n = 162;
os.write(intToByteArray(n));
// Setting Width
int gs_width = 29;
os.write(intToByteArray(gs_width));
int w = 119;
os.write(intToByteArray(w));
int n_width = 2;
os.write(intToByteArray(n_width));
} catch (Exception e) {
Log.e("MainActivity", "Exe ", e);
}
}
};
t.start();
}
});
mDisc = (Button) findViewById(R.id.dis);
mDisc.setOnClickListener(new View.OnClickListener() {
public void onClick(View mView) {
if (mBluetoothAdapter != null)
mBluetoothAdapter.disable();
}
});
}// onCreate
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
try {
if (mBluetoothSocket != null)
mBluetoothSocket.close();
} catch (Exception e) {
Log.e("Tag", "Exe ", e);
}
}
@Override
public void onBackPressed() {
try {
if (mBluetoothSocket != null)
mBluetoothSocket.close();
} catch (Exception e) {
Log.e("Tag", "Exe ", e);
}
setResult(RESULT_CANCELED);
finish();
}
public void onActivityResult(int mRequestCode, int mResultCode,
Intent mDataIntent) {
super.onActivityResult(mRequestCode, mResultCode, mDataIntent);
switch (mRequestCode) {
case REQUEST_CONNECT_DEVICE:
if (mResultCode == Activity.RESULT_OK) {
Bundle mExtra = mDataIntent.getExtras();
String mDeviceAddress = mExtra.getString("DeviceAddress");
Log.v(TAG, "Coming incoming address " + mDeviceAddress);
mBluetoothDevice = mBluetoothAdapter
.getRemoteDevice(mDeviceAddress);
mBluetoothConnectProgressDialog = ProgressDialog.show(this,
"Connecting...", mBluetoothDevice.getName() + " : "
+ mBluetoothDevice.getAddress(), true, false);
Thread mBlutoothConnectThread = new Thread(this);
mBlutoothConnectThread.start();
// pairToDevice(mBluetoothDevice); This method is replaced by
// progress dialog with thread
}
break;
case REQUEST_ENABLE_BT:
if (mResultCode == Activity.RESULT_OK) {
ListPairedDevices();
Intent connectIntent = new Intent(MainActivity.this,
DeviceListActivity.class);
startActivityForResult(connectIntent, REQUEST_CONNECT_DEVICE);
} else {
Toast.makeText(MainActivity.this, "Message", Toast.LENGTH_SHORT).show();
}
break;
}
}
private void ListPairedDevices() {
Set<BluetoothDevice> mPairedDevices = mBluetoothAdapter
.getBondedDevices();
if (mPairedDevices.size() > 0) {
for (BluetoothDevice mDevice : mPairedDevices) {
Log.v(TAG, "PairedDevices: " + mDevice.getName() + " "
+ mDevice.getAddress());
}
}
}
public void run() {
try {
mBluetoothSocket = mBluetoothDevice
.createRfcommSocketToServiceRecord(applicationUUID);
mBluetoothAdapter.cancelDiscovery();
mBluetoothSocket.connect();
mHandler.sendEmptyMessage(0);
} catch (IOException eConnectException) {
Log.d(TAG, "CouldNotConnectToSocket", eConnectException);
closeSocket(mBluetoothSocket);
return;
}
}
private void closeSocket(BluetoothSocket nOpenSocket) {
try {
nOpenSocket.close();
Log.d(TAG, "SocketClosed");
} catch (IOException ex) {
Log.d(TAG, "CouldNotCloseSocket");
}
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
mBluetoothConnectProgressDialog.dismiss();
Toast.makeText(MainActivity.this, "DeviceConnected", Toast.LENGTH_SHORT).show();
}
};
public static byte intToByteArray(int value) {
byte[] b = ByteBuffer.allocate(4).putInt(value).array();
for (int k = 0; k < b.length; k++) {
System.out.println("Selva [" + k + "] = " + "0x"
+ UnicodeFormatter.byteToHex(b[k]));
}
return b[3];
}
public byte[] sel(int val) {
ByteBuffer buffer = ByteBuffer.allocate(2);
buffer.putInt(val);
buffer.flip();
return buffer.array();
}
}
答案 0 :(得分：3)
这不是您打印此行的代码，而是您所做的错误的打印机配置。 。 。 所有打印机都有其配置和设置，但几乎大多数POS打印机都提供配置页边距，HEADER（在您的情况下），页脚和空格检查this作为打印首选项，因此您有两个选择
1 - ＆gt;手动设置首选项（方便）
2 - ＆gt;在打印之前配置/设置首选项（您应该知道打印机命令，以便在实际数据发送之前将其发送到打印机）
最后但同样重要的是，您的POS打印机和Android设备也可能不友好：D。 。 由于错过匹配的通信编码，您的打印机可能会将成功的握手代码/响应插入到可打印的数据中
您必须禁用它或发送打印机喜欢的代码/响应。 。