src/com/eztlib/BluetoothService.java

package com.eztlib;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.UUID;
import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import com.ectrip.cyt.config.MyApp;
import com.ectrip.cyt.utils.LogUtil;
/**
 * 这个类处理所有工作的设置和管理蓝牙连接其他设备 它有一个线程,监听传入连接 一个线程用于连接设备和一个线程用于执行数据传输连接时
 * */
public class BluetoothService
{
	static
	{
		try {
			System.loadLibrary("EZTLIB");
		} catch (Exception e) {
			e.printStackTrace();
		} catch (Throwable e) {
			e.printStackTrace();
		}
	}
	/// <summary>
	/// 端口发送数据
	/// </summary>
	/// <param name="pDataIn">要写入的数据</param>
	/// <param name="Inlen">数据长度</param>
	/// <returns>返回写入的数据长度</returns>
	public static native int BluSendBytes(byte[] pDataIn, int Inlen);
	/// <summary>
	/// 端口读取数据
	/// </summary>
	/// <param name="pDataOut">返回数据</param>
	/// <param name="Outlen">想要读取长度</param>
	/// <returns>返回读取到的数据长</returns>
	public static native int BluReadBytes(byte[] pDataOut, int len);
	//从BluetoothService处理程序发送消息类型
	public static final int MESSAGE_STATE_CHANGE=1;
	public static final int MESSAGE_READ=2;
	public static final int MESSAGE_WRITE=3;
	public static final int MESSAGE_DEVICE_NAME=4;
	public static final int MESSAGE_TOAST=5;
	// BluetoothService收到的处理程序关键的名字
	public static final String DEVICE_NAME="device_name";
	public static final String TOAST="toast";
	public static final String TAG = "BluetoothService";
	public static final boolean LogEnablD = false;
	// 在创建服务器套接字记录SDP的名字
	private static final String NAME = "EZTPrinter";
	// 给这个应用程序设置一个独特的UUID
	private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
	// 当前连接状态的常量
	public static final int STATE_NONE = 0; // 默认的,什么都没做
	public static final int STATE_LISTEN = 1; // 进入连接的监听
	public static final int STATE_CONNECTING = 2;// 启动一个外向连接
	public static final int STATE_CONNECTED = 3; // 连接到一个远程设备
	public static final int STATE_FAILL=8;//失败
	private final BluetoothAdapter mAdapter;
	private final Handler mHandler;
	//	private AcceptThread mAcceptThread= null;
	private ConnectThread mConnectThread= null;
	private static ConnectedThread mConnectedThread= null;
	private static int mState= STATE_NONE;
	private static boolean stop=false;
	//构造函数。准备一个新的BTPrinter会话 ontext UI活动上下文 handler 处理程序发送消息发送回UI活动
	public BluetoothService(Context context, Handler handler) {
		stop=true;
		mAdapter = BluetoothAdapter.getDefaultAdapter();
		mState = STATE_NONE;
		mHandler = handler;
		try {
			COMPacket.COMClose();
		} catch (Exception e) {
			e.printStackTrace();
		} catch (Throwable e) {
			e.printStackTrace();
		}
		Thread thread=new Thread(new Runnable()
		{
			byte[] buffer = new byte[4096];
			int bytes;
			@Override
			public void run()
			{
				while (!stop)
				{
					if ((mState==BluetoothService.STATE_CONNECTED) && (mConnectedThread != null))
					{
						bytes=BluReadBytes(buffer,buffer.length);
						if(bytes>0)
						{
							mConnectedThread.write(buffer, 0, bytes);
						}
					}
				}
			}
		});
		stop=false;
		thread.start();
	}
	//设置当前状态的连接 state 定义当前的连接状态
	private synchronized void setState(int state) {
		if (LogEnablD)
		{Log.d(TAG, "setState()" + mState + "->" + state);}
		mState = state;
		// 给新状态Handler让UI可以更新
		mHandler.obtainMessage(MESSAGE_STATE_CHANGE, state,-1).sendToTarget();
	}
	//返回当前的连接状态
	public synchronized int getState() {return mState;}
	//启动服务。特别是在聆听(服务器)模式开始AcceptThread 会话,调用活动onResume()
	public synchronized void start() {
		if (LogEnablD){Log.d(TAG, "start");}
		// 取消任何线程试图连接
		if (mConnectThread != null) {
			mConnectThread.cancel();
			mConnectThread = null;
		}
		// 在运行一个连接时取消任何线程
		if (mConnectedThread != null) {
			mConnectedThread.cancel();
			mConnectedThread = null;
		}
		// 启动线程来监听BluetoothServerSocket
//		if (mAcceptThread == null) {
//			mAcceptThread = new AcceptThread();
//			mAcceptThread.start();
//		}
		setState(STATE_LISTEN);
		try {
			COMPacket.COMClose();
		} catch (Exception e) {
			e.printStackTrace();
		} catch (Throwable e) {
			e.printStackTrace();
		}
	}
	//启动ConnectThread发起连接到一个远程设备。 device BluetoothDevice的连接
	public synchronized void connect(BluetoothDevice device) {
		if (LogEnablD){LogUtil.d(TAG, "connect to:" + device);}
		// 取消任何线程试图连接
		if (mState == STATE_CONNECTING)
		{
			if (mConnectThread != null)
			{
				mConnectThread.cancel();
				mConnectThread = null;
			}
		}
		// 正在运行一个连接时取消任何线程
		if (mConnectedThread != null)
		{
			mConnectedThread.cancel();
			mConnectedThread = null;
		}
		// 启动线程与给定的设备
		mConnectThread = new ConnectThread(device);
		mConnectThread.start();
		setState(STATE_CONNECTING);
		COMPacket.COMClose();
	}
	//启动ConnectedThread开始管理一个蓝牙连接
	//@param socket  BluetoothSocket上的连接
	//@param device  这个BluetoothDevice已经连接
	public synchronized void connected(BluetoothSocket socket,BluetoothDevice device)
	{
		if (LogEnablD){LogUtil.d(TAG, "Connected");}
		// 取消线程完成连接
		if (mConnectThread != null) {
			mConnectThread.cancel();
			mConnectThread = null;
		}
		// 正在运行一个连接取消任何线程
		if (mConnectedThread != null) {
			mConnectedThread.cancel();
			mConnectedThread = null;
		}
		// 取消接受线程,因为只是想连接到一个设备
//		if (mAcceptThread != null) {
//			mAcceptThread.cancel();
//			mAcceptThread = null;
//		}
		// 启动线程来管理连接和执行传输
		mConnectedThread = new ConnectedThread(socket);
		mConnectedThread.start();
		// 发送连接设备的名称回到UI活动
		Message msg = mHandler.obtainMessage(MESSAGE_DEVICE_NAME);
		Bundle bundle = new Bundle();
		bundle.putString(DEVICE_NAME, device.getName());
		msg.setData(bundle);
		mHandler.sendMessage(msg);
		setState(STATE_CONNECTED);
		COMPacket.COMOpen("Bluetooth",0,0);
	}
	//停止所有的线程
	public synchronized void stop()
	{
		if (LogEnablD){Log.d(TAG, "stop");}
		setState(STATE_NONE);
		if (mConnectThread != null) {
			mConnectThread.cancel();
			mConnectThread = null;
		}
		if (mConnectedThread != null) {
			mConnectedThread.cancel();
			mConnectedThread = null;
		}
//		if (mAcceptThread != null) {
//			mAcceptThread.cancel();
//			mAcceptThread = null;
//		}
		COMPacket.COMClose();
	}
	//启动ConnectThread发起连接到一个远程设备
	//@param device BluetoothDevice的连接
	//连接请求失败并通知UI活动
	private void connectionFailed() {
		setState(STATE_FAILL);
		// 一条失败消息发送回活动
		MyApp.getInstance().setBluConnection(false);
		Message msg = mHandler.obtainMessage(MESSAGE_TOAST);
		Bundle bundle = new Bundle();
		bundle.putString(TOAST, "不能连接到设备！");
		bundle.putBoolean("sucess", false);
		msg.setData(bundle);
		mHandler.sendMessage(msg);
	}
	//表示这个连接丢失并通知UI活动。
	private void connectionLost() {
		// 一条失败消息发送给Activity
		Message msg = mHandler.obtainMessage(MESSAGE_TOAST);
		Bundle bundle = new Bundle();
		bundle.putString(TOAST, "已断开与打印机的连接！");
		msg.setData(bundle);
		mHandler.sendMessage(msg);
	}
	//启动ConnectedThread开始管理一个蓝牙连接 socket BluetoothSocket上的连接 device
	//装置的BluetoothDevice已经连接
	//这个线程运行试图使一个外向连接一个设备。它运行直通要么连接成功要么失败。
	private class ConnectThread extends Thread {
		private BluetoothSocket mmSocket;
		private BluetoothDevice mmDevice;
		@SuppressLint("NewApi") public ConnectThread(BluetoothDevice device) {
			mmDevice = device;
			BluetoothSocket tmp = null;
			// 为一个连接的BluetoothDevice得到一个BluetoothSocket
			try {
				Method m = null;
				try {
					m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
				} catch (NoSuchMethodException e) {
					e.printStackTrace();
				}
				try {
					tmp = (BluetoothSocket) m.invoke(device, 1);
					tmp.connect();
					MyApp.getInstance().setBluConnection(true);
				} catch (IllegalAccessException e) {
					e.printStackTrace();
					connectionFailed();
					return;
				} catch (IllegalArgumentException e) {
					e.printStackTrace();
					connectionFailed();
					return;
				} catch (Exception e){
					e.printStackTrace();
					connectionFailed();
					return;
				}
			} catch (Exception e) {
				connectionFailed();
				Log.e(TAG, "create failed"+e);
				return;
			}
			mmSocket = tmp;
		}
		public void run() {
			LogUtil.i(TAG, "BEFIN mConnectThrread");
			setName("ConnectThread");
			mAdapter.cancelDiscovery();
			// 让BluetoothSocket的连接
			try {
				// 一个阻塞调用返回成功连接或一个例外
				if(!MyApp.getInstance().isBluConnection()){
					if(mmSocket!=null){
						mmSocket.connect();
					}else{
						setState(STATE_FAILL);
						return;
					}
					if(mmSocket==null){
						setState(STATE_FAILL);
						return;
					}
				}
			} catch (IOException e) {
				e.printStackTrace();
				// 关闭socket
				connectionFailed();
				try {
					mmSocket.close();
				} catch (IOException e2) {
					Log.e(TAG,
							"unable to close() socket during connection failure",
							e2);
				}
				// 启动服务到重启的听力模式
//				BluetoothService.this.start();
				return;
			}
			if(MyApp.getInstance().isBluConnection()){
				// 重置ConnectThread
				synchronized (BluetoothService.this) {
					mConnectThread = null;
				}
				// 启动连接的线程
				connected(mmSocket, mmDevice);
			}
		}
		public void cancel() {
			try {
				mmDevice.describeContents();
				if(mmSocket!=null){
					mmSocket.close();
					mmSocket=null;
				}
			} catch (IOException e) {
				Log.e(TAG, "close() of connect socket failed", e);
			}
		}
	}
	//这个线程运行在连接一个远程的设备上 它处理所有传入和传出的传输。
	private class ConnectedThread extends Thread {
		private BluetoothSocket mmSocket;
		private InputStream mmInStream;
		private OutputStream mmOutStream;
		boolean stop=false;
		public ConnectedThread(BluetoothSocket socket) {
			Log.d(TAG, "create ConnectedThread");
			mmSocket = socket;
			InputStream tmpIn = null;
			OutputStream tmpOut = null;
			// BluetoothSocket输入和输出流
			try {
				tmpIn = socket.getInputStream();
				tmpOut = socket.getOutputStream();
			} catch (IOException e) {
				Log.e(TAG, "temp sockets not created", e);
			}
			mmInStream = tmpIn;
			mmOutStream = tmpOut;
		}
		public void run()
		{
			Log.i(TAG, "BEGIN mConnectedThread");
			byte[] buffer = new byte[4096];
			int bytes;
			while (!stop)
			{
				try
				{
					// 从InputStream中阅读
					bytes = mmInStream.read(buffer);
					BluSendBytes(buffer,bytes);
					//mHandler.obtainMessage(MainActivity.MESSAGE_READ,bytes, -1, buffer).sendToTarget();
				}
				catch (IOException e)
				{
					Log.e(TAG, "disconnected", e);
					connectionLost();
					if (mState != STATE_NONE)
					{
						BluetoothService.this.start();
					}else{
						connectionLost();
					}
					break;
				}
			}
		}
		//OutStream写入连接
		//@param buffer 写的字节
		public void write(byte[] buffer,int offset, int count) {
			try
			{
				mmOutStream.write(buffer,offset,count);
				// 分享所发送的消息回到UI的Activity
				//mHandler.obtainMessage(MESSAGE_WRITE, -1, -1,buffer).sendToTarget();
			} catch (IOException e)
			{
				Log.e(TAG, "Exception during write", e);
			}
		}
		public void cancel() {
			try {
				mmInStream.close();
				mmInStream=null;
				mmOutStream.close();
				mmOutStream=null;
				stop=true;
				mmSocket.close();
			} catch (IOException e) {
				Log.e(TAG, "close() of connect socket failed", e);
			}
		}
	}
	// 与设备配对 参考源码：platform/packages/apps/Settings.git
	// \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java
	public static boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {
		Method createBondMethod = btClass.getMethod("createBond");
		Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
		return returnValue.booleanValue();
	}
	// 与设备解除配对 参考源码：platform/packages/apps/Settings.git
	// \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java
	public static boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {
		Method removeBondMethod = btClass.getMethod("removeBond");
		Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
		return returnValue.booleanValue();
	}
}