Use a handheld bluetooth printer with android(使用带有 android 的手持式蓝牙打印机)
本文介绍了使用带有 android 的手持式蓝牙打印机的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一台蓝牙手持打印机，我可以使用 Mac 上的 SPP 连接(使用 Coolterm)与之通信.当我尝试在 Android 上做同样的事情(使用平台 7)时，我遇到了多个问题:
打印机似乎不支持/不需要 PIN 验证.从 OSX 连接时，我只是选择了不使用 pin"选项，然后它就配对了.在 Android 中，当我使用
device.createRfcommSocketToServiceRecord()时，它总是最终要求我提供 PIN/Key(我没有/不需要).我使用反射技巧解决了这个问题:方法 m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});BluetoothSocket 连接 = (BluetoothSocket) m.invoke(device, 1);我不确定这是否真的有效，但打印机上闪烁的 LED 停止闪烁，这让我相信它确实有效.
一旦有了套接字，我就尝试使用以下方法将字节数据写入流:
byte[] buffer = new byte[3];缓冲区[0] =(字节)0x8A；缓冲区[1] =(字节)0xC1；缓冲区[2] =(字节)0x04；outStream.write(缓冲区)；int 响应 = inStream.read();mySocket.close();在 OSX 上从 Coolterm 发送相同的三字节序列会从打印机打印测试页.但是，这似乎使线程在 Android 上挂起(读取).
这里有什么我遗漏的吗?
这似乎只在我将频道设置为 1 时才有效.所以这意味着我在这里做一些事情.
解决方案
@Trevor Page 我认为是在正确的道路上.这是我用来连接基本邮票微控制器的谷歌示例.
<上一页>/** 版权所有 (C) 2009 Android 开源项目** 根据 Apache 许可证 2.0 版(许可证")获得许可；* 除非遵守许可，否则您不得使用此文件.* 您可以在以下网址获取许可证的副本** http://www.apache.org/licenses/LICENSE-2.0** 除非适用法律要求或书面同意，否则软件*根据许可分发是在原样"基础上分发的，* 不提供任何明示或暗示的保证或条件.* 请参阅许可证以了解特定语言的管理权限和* 许可证下的限制.*/包 com.your_package;导入 java.io.IOException；导入 java.io.InputStream；导入 java.io.OutputStream；导入 java.util.UUID；导入 android.bluetooth.BluetoothAdapter；导入 android.bluetooth.BluetoothDevice；导入 android.bluetooth.BluetoothServerSocket；导入 android.bluetooth.BluetoothSocket；导入android.content.Context；导入android.os.Bundle；导入android.os.Handler；导入android.os.Message；导入android.util.Log；/*** 这个类完成了设置和管理蓝牙的所有工作*与其他设备的连接.它有一个线程来监听* 传入连接，用于连接设备的线程，以及* 连接时执行数据传输的线程.*/公共类蓝牙服务{//调试私有静态最终字符串 TAG = "BluetoothService_BoeBot";私有静态最终布尔值 D = true;//创建服务器套接字时 SDP 记录的名称private static final String NAME_SECURE = "BluetoothSecure";private static final String NAME_INSECURE = "BluetoothInsecure";//此应用程序的唯一 UUID私有静态最终 UUID MY_UUID_SECURE =UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");私有静态最终 UUID MY_UUID_INSECURE =UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");//成员字段私有最终蓝牙适配器 mAdapter；私有最终处理程序 mHandler；私有AcceptThread mSecureAcceptThread；私有AcceptThread mInsecureAcceptThread；私有连接线程 mConnectThread；私有连接线程 mConnectedThread；私有int mState；//表示当前连接状态的常量公共静态最终 int STATE_NONE = 0;//我们什么都不做公共静态最终 int STATE_LISTEN = 1;//现在监听传入的连接公共静态最终 int STATE_CONNECTING = 2;//现在开始一个传出连接公共静态最终 int STATE_CONNECTED = 3;//现在连接到远程设备/*** 构造函数.准备一个新的 BluetoothChat 会话.* @param context UI 活动上下文* @param handler 将消息发送回 UI Activity 的 Handler*/公共蓝牙服务(上下文上下文，处理程序处理程序){mAdapter = BluetoothAdapter.getDefaultAdapter();mState = STATE_NONE；mHandler = 处理程序；}/*** 设置聊天连接的当前状态* @param state 定义当前连接状态的整数*/私有同步无效 setState(int state){如果 (D)Log.d(TAG, "setState() " + mState + " -> " + state);mState = 状态；//将新状态赋予 Handler，以便 UI Activity 可以更新mHandler.obtainMessage(BoeBot.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();}/*** 返回当前连接状态.*/公共同步 int getState(){返回 mState；}/*** 启动聊天服务.具体启动AcceptThread开始一个* 监听(服务器)模式下的会话.活动调用 onResume() */公共同步无效开始(){如果 (D)Log.d(TAG, "开始");//取消任何试图建立连接的线程如果(mConnectThread！= null){mConnectThread.cancel();mConnectThread = null;}//取消当前运行连接的任何线程如果(mConnectedThread ！= null){mConnectedThread.cancel();mConnectedThread = null;}setState(STATE_LISTEN);//启动线程以侦听 BluetoothServerSocket如果(mSecureAcceptThread == null){mSecureAcceptThread = new AcceptThread(true);mSecureAcceptThread.start();}如果(mInsecureAcceptThread == null){mInsecureAcceptThread = new AcceptThread(false);mInsecureAcceptThread.start();}}/*** 启动 ConnectThread 以启动与远程设备的连接.* @param device 要连接的蓝牙设备* @param secure 套接字安全类型 - Secure (true) , Insecure (false)*/公共同步无效连接(蓝牙设备设备，布尔安全){如果 (D)Log.d(TAG, "连接到:" + 设备);//取消任何试图建立连接的线程如果(mState == STATE_CONNECTING){如果(mConnectThread！= null){mConnectThread.cancel();mConnectThread = null;}}//取消当前运行连接的任何线程如果(mConnectedThread ！= null){mConnectedThread.cancel();mConnectedThread = null;}尝试{//启动线程以连接给定的设备mConnectThread = new ConnectThread(设备，安全)；mConnectThread.start();setState(STATE_CONNECTING);}catch(异常 e){}}/*** 启动 ConnectedThread 以开始管理蓝牙连接* @param socket 建立连接的蓝牙套接字* @param device 已连接的蓝牙设备*/公共同步无效连接(蓝牙套接字套接字，蓝牙设备设备，最终字符串套接字类型){如果 (D)Log.d(TAG, "已连接, 套接字类型:" + socketType);//取消完成连接的线程如果(mConnectThread！= null){mConnectThread.cancel();mConnectThread = null;}//取消当前运行连接的任何线程如果(mConnectedThread ！= null){mConnectedThread.cancel();mConnectedThread = null;}//取消接受线程，因为我们只想连接一个设备如果(mSecureAcceptThread ！= null){mSecureAcceptThread.cancel();mSecureAcceptThread = null;}如果(mInsecureAcceptThread ！= null){mInsecureAcceptThread.cancel();mInsecureAcceptThread = null;}//启动线程来管理连接并执行传输mConnectedThread = new ConnectedThread(socket, socketType);mConnectedThread.start();//将连接设备的名称发送回 UI Activity消息消息 = mHandler.obtainMessage(BoeBot.MESSAGE_DEVICE_NAME);捆绑捆绑 = 新捆绑()；bundle.putString(BoeBot.DEVICE_NAME, device.getName());msg.setData(捆绑)；mHandler.sendMessage(msg);setState(STATE_CONNECTED);}/*** 停止所有线程*/公共同步无效停止(){如果 (D)Log.d(TAG, "停止");如果(mConnectThread！= null){mConnectThread.cancel();mConnectThread = null;}如果(mConnectedThread ！= null){mConnectedThread.cancel();mConnectedThread = null;}如果(mSecureAcceptThread ！= null){mSecureAcceptThread.cancel();mSecureAcceptThread = null;}如果(mInsecureAcceptThread ！= null){mInsecureAcceptThread.cancel();mInsecureAcceptThread = null;}setState(STATE_NONE);}/*** 以非同步方式写入ConnectedThread* @param out 要写入的字节数* @see ConnectedThread#write(byte[])*/公共无效写入(字节[]输出){//创建临时对象连接线程 r;//同步一个ConnectedThread的副本同步(这个){如果(mState！= STATE_CONNECTED)返回;r = mConnectedThread;}//执行非同步写入r.write(out);}/*** 表示连接尝试失败并通知UI Activity.*/私人无效连接失败(){//向Activity发送失败消息消息消息 = mHandler.obtainMessage(BoeBot.MESSAGE_TOAST);捆绑捆绑 = 新捆绑()；bundle.putString(BoeBot.TOAST, "无法连接设备");msg.setData(捆绑)；mHandler.sendMessage(msg);//重新启动服务以重新启动监听模式BluetoothService.this.start();}/*** 表示连接丢失并通知UI Activity.*/私人无效连接丢失(){//向Activity发送失败消息消息消息 = mHandler.obtainMessage(BoeBot.MESSAGE_TOAST);捆绑捆绑 = 新捆绑()；bundle.putString(BoeBot.TOAST, "设备连接丢失");msg.setData(捆绑)；mHandler.sendMessage(msg);//重新启动服务以重新启动监听模式BluetoothService.this.start();}/*** 此线程在侦听传入连接时运行.它的行为* 像服务器端客户端.它一直运行直到接受连接*(或直到取消).*/私有类 AcceptThread 扩展 Thread{//本地服务器套接字私有最终 BluetoothServerSocket mmServerSocket；私有字符串 mSocketType；公共AcceptThread(布尔安全){BluetoothServerSocket tmp = null;mSocketType = 安全?安全":不安全"；//创建一个新的监听服务器套接字尝试{如果(安全){tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, MY_UUID_SECURE);} 别的{tmp = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME_INSECURE，MY_UUID_INSECURE)；}} 捕捉(IOException e){Log.e(TAG, "套接字类型:" + mSocketType + "listen() 失败", e);}mmServerSocket = tmp;}@覆盖公共无效运行(){如果 (D){Log.d(TAG, "套接字类型:" + mSocketType + "BEGIN mAcceptThread" + this);}setName("AcceptThread" + mSocketType);BluetoothSocket 套接字 = null;//如果我们没有连接，则监听服务器套接字而(mState！= STATE_CONNECTED){尝试{//这是一个阻塞调用，只会返回一个//连接成功或异常套接字 = mmServerSocket.accept();} 捕捉(IOException e){Log.e(TAG, "套接字类型:" + mSocketType + "accept() 失败", e);休息;}//如果连接被接受如果(套接字！= null){同步(BluetoothService.this){开关(mState){案例STATE_LISTEN:案例状态连接://情况正常.启动连接的线程.已连接(套接字，socket.getRemoteDevice()，mSocketType)；休息;案例状态_无:案例STATE_CONNECTED://未准备好或已连接.终止新套接字.尝试{socket.close();} 捕捉(IOException e){Log.e(TAG, "无法关闭不需要的套接字", e);}休息;}}}}如果 (D){Log.i(TAG, "END mAcceptThread, socket Type: " + mSocketType);}}公共无效取消(){如果 (D){Log.d(TAG, "Socket Type" + mSocketType + "cancel" + this);}尝试{mmServerSocket.close();} 捕捉(IOException e){Log.e(TAG, "Socket Type" + mSocketType + "close() of server failed", e);}}}/*** 该线程在尝试建立传出连接时运行* 带设备.它直接穿过；连接要么* 成功或失败.*/私有类 ConnectThread 扩展 Thread{私有最终蓝牙套接字 mmSocket；私有最终蓝牙设备 mmDevice；私有字符串 mSocketType；公共 ConnectThread(蓝牙设备设备，布尔安全){mmDevice = 设备；蓝牙套接字 tmp = null;mSocketType = 安全?安全":不安全"；//获取一个 BluetoothSocket 用于与//给定蓝牙设备尝试{如果(安全){tmp = device.createRfcommSocketToServiceRecord(MY_UUID_SECURE);} 别的{tmp = device.createInsecureRfcommSocketToServiceRecord(MY_UUID_INSECURE);}} 捕捉(IOException e){Log.e(TAG, "套接字类型:" + mSocketType + "create() failed", e);}mmSocket = tmp;}@覆盖公共无效运行(){Log.i(TAG, "BEGIN mConnectThread SocketType:" + mSocketType);setName("ConnectThread" + mSocketType);//始终取消发现，因为它会减慢连接速度mAdapter.cancelDiscovery();//与蓝牙套接字建立连接尝试{//这是一个阻塞调用，只会返回一个//连接成功或异常mmSocket.connect();} 捕捉(IOException e){//关闭套接字尝试{mmSocket.close();} 捕捉(IOException e2){Log.e(TAG, "unable to close() " + mSocketType + " socket during connection failure", e2);}连接失败();返回;}//重置 ConnectThread 因为我们已经完成了同步(BluetoothService.this){mConnectThread = null;}尝试{//启动连接的线程已连接(mmSocket，mmDevice，mSocketType)；}catch(异常 e){Log.e(TAG, "", e);}}公共无效取消(){尝试{mmSocket.close();} 捕捉(IOException e){Log.e(TAG, "close() of connect " + mSocketType + "socket failed", e);}}}/*** 此线程在与远程设备连接期间运行.*它处理所有传入和传出的传输.*/私有类 ConnectedThread 扩展 Thread{私有最终蓝牙套接字 mmSocket；私有最终 InputStream mmInStream;私有最终输出流 mmOutStream；公共连接线程(蓝牙套接字套接字，字符串套接字类型){Log.d(TAG, "创建 ConnectedThread:" + socketType);mmSocket = 插座；输入流 tmpIn = null;输出流 tmpOut = null;//获取 BluetoothSocket 输入和输出流尝试{tmpIn = socket.getInputStream();tmpOut = socket.getOutputStream();} 捕捉(IOException e){Log.e(TAG, "临时套接字未创建", e);}mmInStream = tmpIn;mmOutStream = tmpOut；}@覆盖公共无效运行(){Log.i(TAG, "开始 mConnectedThread");字节[]缓冲区=新字节[1024]；整数字节；//连接时继续监听 InputStream而(真){尝试{//从 InputStream 中读取字节= mmInStream.read(缓冲区)；//将获取的字节发送到 UI ActivitymHandler.obtainMessage(BoeBot.MESSAGE_READ, bytes, -1, buffer).sendToTarget();} 捕捉(IOException e){Log.e(TAG, "断开连接", e);连接丢失()；休息;}}}/*** 写入连接的 OutStream.* @param buffer 要写入的字节数*/公共无效写入(字节[]缓冲区){尝试{mmOutStream.write(缓冲区)；//将发送的消息分享回 UI ActivitymHandler.obtainMessage(BoeBot.MESSAGE_WRITE, -1, -1, 缓冲区).sendToTarget();} 捕捉(IOException e){Log.e(TAG, "写入异常", e);}}公共无效取消(){尝试{mmSocket.close();} 捕捉(IOException e){Log.e(TAG, "close() of connect socket failed", e);}}}}测试它是否有效.
BluetoothService mService = new BluetoothService(this, mHandler);mService.write(字节);I have a bluetooth Handheld printer that I am able to communicate to using a SPP connection from my Mac(using Coolterm). When I'm trying to do the same from Android (using platform 7) I am running into multiple issues:
The printer doesn't seem to support/need PIN Authentication. When connecting from OSX, I just selected the option that said "Do not use a pin" and it got paired. In Android, when I use
device.createRfcommSocketToServiceRecord(), it always ends up asking me for a PIN/Key(which I don't have/need). I solved this using the reflection trick:Method m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class}); BluetoothSocket connection = (BluetoothSocket) m.invoke(device, 1);I am unsure whether this actually worked, but the blinking LED on the printer stops blinking, which makes me believe it did.
Once I have the socket, I try to write byte data to the stream using:
byte[] buffer = new byte[3]; buffer[0] = (byte) 0x8A; buffer[1] = (byte) 0xC1; buffer[2] = (byte) 0x04; outStream.write(buffer); int response = inStream.read(); mySocket.close();Sending the same three-byte sequence from Coolterm on OSX printed a test page from the printer. However, this seems to make the thread hang on Android(the read).
Is there something I am missing out here?
EDIT: This seems to work only when I set channel to 1. So that means I am on to something here.
解决方案
@Trevor Page I think was on the right path. Here is a google's example I've used to connect to a basic stamp micro-controller.
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.your_package;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
/**
* This class does all the work for setting up and managing Bluetooth
* connections with other devices. It has a thread that listens for
* incoming connections, a thread for connecting with a device, and a
* thread for performing data transmissions when connected.
*/
public class BluetoothService
{
// Debugging
private static final String TAG = "BluetoothService_BoeBot";
private static final boolean D = true;
// Name for the SDP record when creating server socket
private static final String NAME_SECURE = "BluetoothSecure";
private static final String NAME_INSECURE = "BluetoothInsecure";
// Unique UUID for this application
private static final UUID MY_UUID_SECURE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private static final UUID MY_UUID_INSECURE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mSecureAcceptThread;
private AcceptThread mInsecureAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
/**
* Constructor. Prepares a new BluetoothChat session.
* @param context The UI Activity Context
* @param handler A Handler to send messages back to the UI Activity
*/
public BluetoothService(Context context, Handler handler)
{
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
}
/**
* Set the current state of the chat connection
* @param state An integer defining the current connection state
*/
private synchronized void setState(int state)
{
if (D)
Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BoeBot.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
/**
* Return the current connection state. */
public synchronized int getState()
{
return mState;
}
/**
* Start the chat service. Specifically start AcceptThread to begin a
* session in listening (server) mode. Called by the Activity onResume() */
public synchronized void start()
{
if (D)
Log.d(TAG, "start");
// Cancel any thread attempting to make a connection
if (mConnectThread != null)
{
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null)
{
mConnectedThread.cancel();
mConnectedThread = null;
}
setState(STATE_LISTEN);
// Start the thread to listen on a BluetoothServerSocket
if (mSecureAcceptThread == null)
{
mSecureAcceptThread = new AcceptThread(true);
mSecureAcceptThread.start();
}
if (mInsecureAcceptThread == null)
{
mInsecureAcceptThread = new AcceptThread(false);
mInsecureAcceptThread.start();
}
}
/**
* Start the ConnectThread to initiate a connection to a remote device.
* @param device The BluetoothDevice to connect
* @param secure Socket Security type - Secure (true) , Insecure (false)
*/
public synchronized void connect(BluetoothDevice device, boolean secure)
{
if (D)
Log.d(TAG, "connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING)
{
if (mConnectThread != null)
{
mConnectThread.cancel();
mConnectThread = null;
}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null)
{
mConnectedThread.cancel();
mConnectedThread = null;
}
try
{
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device, secure);
mConnectThread.start();
setState(STATE_CONNECTING);
}catch(Exception e)
{
}
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
* @param socket The BluetoothSocket on which the connection was made
* @param device The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket, BluetoothDevice device, final String socketType)
{
if (D)
Log.d(TAG, "connected, Socket Type:" + socketType);
// Cancel the thread that completed the connection
if (mConnectThread != null)
{
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null)
{
mConnectedThread.cancel();
mConnectedThread = null;
}
// Cancel the accept thread because we only want to connect to one device
if (mSecureAcceptThread != null)
{
mSecureAcceptThread.cancel();
mSecureAcceptThread = null;
}
if (mInsecureAcceptThread != null)
{
mInsecureAcceptThread.cancel();
mInsecureAcceptThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket, socketType);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(BoeBot.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BoeBot.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
/**
* Stop all threads
*/
public synchronized void stop()
{
if (D)
Log.d(TAG, "stop");
if (mConnectThread != null)
{
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null)
{
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mSecureAcceptThread != null)
{
mSecureAcceptThread.cancel();
mSecureAcceptThread = null;
}
if (mInsecureAcceptThread != null)
{
mInsecureAcceptThread.cancel();
mInsecureAcceptThread = null;
}
setState(STATE_NONE);
}
/**
* Write to the ConnectedThread in an unsynchronized manner
* @param out The bytes to write
* @see ConnectedThread#write(byte[])
*/
public void write(byte[] out)
{
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this)
{
if (mState != STATE_CONNECTED)
return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
/**
* Indicate that the connection attempt failed and notify the UI Activity.
*/
private void connectionFailed()
{
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BoeBot.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BoeBot.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
// Start the service over to restart listening mode
BluetoothService.this.start();
}
/**
* Indicate that the connection was lost and notify the UI Activity.
*/
private void connectionLost()
{
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BoeBot.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BoeBot.TOAST, "Device connection was lost");
msg.setData(bundle);
mHandler.sendMessage(msg);
// Start the service over to restart listening mode
BluetoothService.this.start();
}
/**
* This thread runs while listening for incoming connections. It behaves
* like a server-side client. It runs until a connection is accepted
* (or until cancelled).
*/
private class AcceptThread extends Thread
{
// The local server socket
private final BluetoothServerSocket mmServerSocket;
private String mSocketType;
public AcceptThread(boolean secure)
{
BluetoothServerSocket tmp = null;
mSocketType = secure ? "Secure" : "Insecure";
// Create a new listening server socket
try
{
if (secure)
{
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, MY_UUID_SECURE);
} else
{
tmp = mAdapter.listenUsingInsecureRfcommWithServiceRecord(
NAME_INSECURE, MY_UUID_INSECURE);
}
} catch (IOException e)
{
Log.e(TAG, "Socket Type: " + mSocketType + "listen() failed", e);
}
mmServerSocket = tmp;
}
@Override
public void run()
{
if (D)
{
Log.d(TAG, "Socket Type: " + mSocketType + "BEGIN mAcceptThread" + this);
}
setName("AcceptThread" + mSocketType);
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != STATE_CONNECTED)
{
try
{
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (IOException e)
{
Log.e(TAG, "Socket Type: " + mSocketType + "accept() failed", e);
break;
}
// If a connection was accepted
if (socket != null)
{
synchronized (BluetoothService.this)
{
switch (mState)
{
case STATE_LISTEN:
case STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice(), mSocketType);
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate new socket.
try
{
socket.close();
} catch (IOException e)
{
Log.e(TAG, "Could not close unwanted socket", e);
}
break;
}
}
}
}
if (D)
{
Log.i(TAG, "END mAcceptThread, socket Type: " + mSocketType);
}
}
public void cancel()
{
if (D)
{
Log.d(TAG, "Socket Type" + mSocketType + "cancel " + this);
}
try
{
mmServerSocket.close();
} catch (IOException e)
{
Log.e(TAG, "Socket Type" + mSocketType + "close() of server failed", e);
}
}
}
/**
* This thread runs while attempting to make an outgoing connection
* with a device. It runs straight through; the connection either
* succeeds or fails.
*/
private class ConnectThread extends Thread
{
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
private String mSocketType;
public ConnectThread(BluetoothDevice device, boolean secure)
{
mmDevice = device;
BluetoothSocket tmp = null;
mSocketType = secure ? "Secure" : "Insecure";
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try
{
if (secure)
{
tmp = device.createRfcommSocketToServiceRecord(MY_UUID_SECURE);
} else
{
tmp = device.createInsecureRfcommSocketToServiceRecord(MY_UUID_INSECURE);
}
} catch (IOException e)
{
Log.e(TAG, "Socket Type: " + mSocketType + "create() failed", e);
}
mmSocket = tmp;
}
@Override
public void run()
{
Log.i(TAG, "BEGIN mConnectThread SocketType:" + mSocketType);
setName("ConnectThread" + mSocketType);
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try
{
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e)
{
// Close the socket
try
{
mmSocket.close();
} catch (IOException e2)
{
Log.e(TAG, "unable to close() " + mSocketType + " socket during connection failure", e2);
}
connectionFailed();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothService.this)
{
mConnectThread = null;
}
try
{
// Start the connected thread
connected(mmSocket, mmDevice, mSocketType);
}catch(Exception e)
{
Log.e(TAG, "", e);
}
}
public void cancel()
{
try
{
mmSocket.close();
} catch (IOException e)
{
Log.e(TAG, "close() of connect " + mSocketType + " socket failed", e);
}
}
}
/**
* This thread runs during a connection with a remote device.
* It handles all incoming and outgoing transmissions.
*/
private class ConnectedThread extends Thread
{
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket, String socketType)
{
Log.d(TAG, "create ConnectedThread: " + socketType);
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try
{
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e)
{
Log.e(TAG, "temp sockets not created", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
@Override
public void run()
{
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true)
{
try
{
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BoeBot.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
} catch (IOException e)
{
Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
}
}
/**
* Write to the connected OutStream.
* @param buffer The bytes to write
*/
public void write(byte[] buffer)
{
try
{
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BoeBot.MESSAGE_WRITE, -1, -1, buffer).sendToTarget();
} catch (IOException e)
{
Log.e(TAG, "Exception during write", e);
}
}
public void cancel()
{
try
{
mmSocket.close();
} catch (IOException e)
{
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
}
Test to see if it works.
BluetoothService mService = new BluetoothService(this, mHandler);
mService.write(Bytes);
这篇关于使用带有 android 的手持式蓝牙打印机的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！
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本文标题为：使用带有 android 的手持式蓝牙打印机
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