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   源码介绍

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package com.lgl.bluetoothget;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener {

	// 本地蓝牙适配器
	private BluetoothAdapter mBluetoothAdapter;
	// 列表
	private ListView lvDevices;
	// 存储搜索到的蓝牙
	private List<String> bluetoothDevices = new ArrayList<String>();
	// listview的adapter
	private ArrayAdapter<String> arrayAdapter;
	// UUID.randomUUID()随机获取UUID
	private final UUID MY_UUID = UUID
	 .fromString("db764ac8-4b08-7f25-aafe-59d03c27bae3");
	// 连接对象的名称
	private final String NAME = "LGL";

	// 这里本身即是服务端也是客户端，需要如下类
	private BluetoothSocket clientSocket;
	private BluetoothDevice device;
	// 输出流_客户端需要往服务端输出
	private OutputStream os;
	//线程类的实例
	private AcceptThread ac;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		initView();
	}

	private void initView() {

		// 获取本地蓝牙适配器
		mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

		// 判断手机是否支持蓝牙
		if (mBluetoothAdapter == null) {
			Toast.makeText(this, "设备不支持蓝牙", Toast.LENGTH_SHORT).show();
			finish();
		}

		// 判断是否打开蓝牙
		if (!mBluetoothAdapter.isEnabled()) {
			// 弹出对话框提示用户是后打开
			Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
			startActivityForResult(intent, 1);
			// 不做提示，强行打开
			// mBluetoothAdapter.enable();
		}
		// 初始化listview
		lvDevices = (ListView) findViewById(R.id.lvDevices);
		lvDevices.setOnItemClickListener(this);

		// 获取已经配对的设备
		Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
				.getBondedDevices();

		// 判断是否有配对过的设备
		if (pairedDevices.size() > 0) {
			for (BluetoothDevice device : pairedDevices) {
				// 遍历到列表中
				bluetoothDevices.add(device.getName()   ":"
						  device.getAddress()   "\n");
			}
		}

		// adapter
		arrayAdapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, android.R.id.text1,
				bluetoothDevices);
		lvDevices.setAdapter(arrayAdapter);
		
		//启动服务
		ac = new AcceptThread();
		ac.start();

		/**
		 * 异步搜索蓝牙设备——广播接收
		 */
		// 找到设备的广播
		IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
		// 注册广播
		registerReceiver(receiver, filter);
		// 搜索完成的广播
		filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
		// 注册广播
		registerReceiver(receiver, filter);
	}

	public void btnSearch(View v) {
		// 设置进度条
		setProgressBarIndeterminateVisibility(true);
		setTitle("正在搜索...");
		// 判断是否在搜索,如果在搜索，就取消搜索
		if (mBluetoothAdapter.isDiscovering()) {
			mBluetoothAdapter.cancelDiscovery();
		}
		// 开始搜索
		mBluetoothAdapter.startDiscovery();
	}

	// 广播接收器
	private final BroadcastReceiver receiver = new BroadcastReceiver() {

		@Override
		public void onReceive(Context context, Intent intent) {
			// 收到的广播类型
			String action = intent.getAction();
			// 发现设备的广播
			if (BluetoothDevice.ACTION_FOUND.equals(action)) {
				// 从intent中获取设备
				BluetoothDevice device = intent
						.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
				// 判断是否配对过
				if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
					// 添加到列表
					bluetoothDevices.add(device.getName()   ":"
							  device.getAddress()   "\n");
					arrayAdapter.notifyDataSetChanged();

				}
				// 搜索完成
			} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED
					.equals(action)) {
				// 关闭进度条
				setProgressBarIndeterminateVisibility(true);
				setTitle("搜索完成！");
			}
		}
	};

	// 客户端
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		// 先获得蓝牙的地址和设备名
		String s = arrayAdapter.getItem(position);
		// 单独解析地址
		String address = s.substring(s.indexOf(":")   1).trim();

		// 主动连接蓝牙
		try {
			// 判断是否在搜索,如果在搜索，就取消搜索
			if (mBluetoothAdapter.isDiscovering()) {
				mBluetoothAdapter.cancelDiscovery();
			}
			try {
				// 判断是否可以获得
				if (device == null) {
					// 获得远程设备
					device = mBluetoothAdapter.getRemoteDevice(address);
				}
				// 开始连接
				if (clientSocket == null) {
					clientSocket = device
							.createRfcommSocketToServiceRecord(MY_UUID);
					// 连接
					clientSocket.connect();
					// 获得输出流
					os = clientSocket.getOutputStream();

				}
			} catch (Exception e) {
				// TODO: handle exception
			}
			// 如果成功获得输出流
			if (os != null) {
				os.write("Hello Bluetooth!".getBytes("utf-8"));
			}

		} catch (Exception e) {
			// TODO: handle exception
		}
	}

	// 服务端，需要监听客户端的线程类
	private Handler handler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			Toast.makeText(MainActivity.this, String.valueOf(msg.obj),
					Toast.LENGTH_SHORT).show();
			super.handleMessage(msg);
		}
	};

	// 线程服务类
	private class AcceptThread extends Thread {
		private BluetoothServerSocket serverSocket;
		private BluetoothSocket socket;
		// 输入 输出流
		private OutputStream os;
		private InputStream is;

		public AcceptThread() {
			try {
				serverSocket = mBluetoothAdapter
						.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		@Override
		public void run() {
			// 截获客户端的蓝牙消息
			try {
				socket = serverSocket.accept(); // 如果阻塞了，就会一直停留在这里
				is = socket.getInputStream();
				os = socket.getOutputStream();
				// 不断接收请求,如果客户端没有发送的话还是会阻塞
				while (true) {
					// 每次只发送128个字节
					byte[] buffer = new byte[128];
					// 读取
					int count = is.read();
					// 如果读取到了，我们就发送刚才的那个Toast
					Message msg = new Message();
					msg.obj = new String(buffer, 0, count, "utf-8");
					handler.sendMessage(msg);
				}
			} catch (Exception e) {
				// TODO: handle exception
			}
		}
	}
}