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<uses-permission android:name="android.permission.BLUETOOTH" />

<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

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import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

private BluetoothAdapter mBluetoothAdapter = null;

public ArrayList<BluetoothDevice> deviceList = new ArrayList<BluetoothDevice>();

// 初始化蓝牙

private void BlueInit()

{

    // 获取蓝牙适配器

    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

    // 请求开启蓝牙

    if (!mBluetoothAdapter.isEnabled()) 

    {

        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

        ((Activity)_context).startActivityForResult(enableBtIntent, 1);

    }

}

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protected void onResume() 

{

    // 将已配对的设备添加到列表中

    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

    deviceList.clear();

    if (pairedDevices.size() > 0) 

    {

        String[] nameList = new String[pairedDevices.size()];

        int i=0;

        for (BluetoothDevice device : pairedDevices)

        {

               deviceList.add(device);

            nameList[i] = device.getName() + "\n" + device.getAddress();

            i++;

     }

        //创建一个ArrayAdapter

        ArrayAdapter<?> adapter=new ArrayAdapter<Object>((Activity)_context,android.R.layout.simple_expandable_list_item_1,nameList);

        DeviceView.setAdapter(adapter);

        //注册一个元素单击事件监听方法

        DeviceView.setOnItemClickListener(new DeviceClick());

    }

}

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//事件按钮触发

public class DeviceClick implements AdapterView.OnItemClickListener 

{

    @Override

    public void onItemClick(AdapterView<?> arg0, View view, int position, long id) 

    {

        onConfirmListener.confirm(deviceList.get(position));

    }

}

public interface OnConfirmListener 

{

    public void confirm(BluetoothDevice device);

}

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="bluetoothtoserial.DeviceActivity" >

    <ListView

        android:id="@+id/DeviceView"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true" >

    </ListView>

</RelativeLayout>

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package bluetoothtoserial;

import java.util.ArrayList;

import java.util.Set;

import android.app.Activity;

import android.app.Dialog;

import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.ListView;

public class DeviceActivity extends Dialog 

{

    Context _context;

    public OnConfirmListener onConfirmListener;

    private ListView DeviceView;

    private BluetoothAdapter mBluetoothAdapter = null;

    public ArrayList<BluetoothDevice> deviceList = new ArrayList<BluetoothDevice>();

    public DeviceActivity(Context context) 

    {

        super(context);

        this._context = context;

        // TODO Auto-generated constructor stub

    }

    @Override

    protected void onCreate(Bundle savedInstanceState) 

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_device);

        DeviceView = (ListView)findViewById(R.id.DeviceView);

        BlueInit();

        onResume();

    }

    // 初始化蓝牙

    private void BlueInit()

    {

        // 获取蓝牙适配器

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        // 请求开启蓝牙

        if (!mBluetoothAdapter.isEnabled()) 

        {

            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

            ((Activity)_context).startActivityForResult(enableBtIntent, 1);

        }

    }

    protected void onResume() 

    {

        // 将已配对的设备添加到列表中

        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

        deviceList.clear();

        if (pairedDevices.size() > 0) 

        {

            String[] nameList = new String[pairedDevices.size()];

            int i=0;

            for (BluetoothDevice device : pairedDevices)

            {

                deviceList.add(device);

                nameList[i] = device.getName() + "\n" + device.getAddress();

                i++;

            }

            //创建一个ArrayAdapter

            ArrayAdapter<?> adapter=new ArrayAdapter<Object>((Activity)_context,android.R.layout.simple_expandable_list_item_1,nameList);

            DeviceView.setAdapter(adapter);

            //注册一个元素单击事件监听方法

            DeviceView.setOnItemClickListener(new DeviceClick());

        }

    }

    //事件按钮触发

      public class DeviceClick implements AdapterView.OnItemClickListener 

      {

        @Override

        public void onItemClick(AdapterView<?> arg0, View view, int position, long id) 

        {

            onConfirmListener.confirm(deviceList.get(position));

        }

      }

      public interface OnConfirmListener 

    {

        public void confirm(BluetoothDevice device);

    }

}

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package Channel;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.UnsupportedEncodingException;

import java.util.UUID;

import android.bluetooth.BluetoothDevice;

import android.bluetooth.BluetoothSocket;

import android.os.Handler;

import android.os.Message;

public class Session extends Thread 

{

    private BluetoothDevice _device = null;

    private BluetoothSocket _socket = null;

    private OutputStream _outStream;

    private InputStream _inStream = null; 

    public boolean IsConnect = false;

    public String Name="";

    public String Address="";

    Handler _handler;

    public Session(BluetoothDevice _device,Handler _handler)

    {

        this._handler = _handler;

        this._device = _device;

        this.Name = this._device.getName();

        this.Address = this._device.getAddress();

        IsConnect = false;

        try 

          {

              // 蓝牙串口服务对应的UUID。如使用的是其它蓝牙服务，需更改下面的字符串

            // UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

              _socket = _device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));

          } catch (Exception e) 

          {

              return;

          }

    }

    public void connect()

    {

        try 

        {

            _socket.connect();

            _outStream = _socket.getOutputStream();

            _inStream = _socket.getInputStream();

            IsConnect = true;

        }

        catch (IOException e) 

        {

            IsConnect = false;

            try {

                _socket.close();

            } catch (IOException e1) 

            {

            }

              return;

        }

    }

    @Override

    public void run() 

    {  

        byte [] buffer = new byte [1024];

        int len = 0;

        while(true) 

        {

             //从InputStream读取

            try 

            {

                len = _inStream.read(buffer);

            } catch (IOException e) 

            {

                continue;

            }

            if(len> 0)

            { 

                Message msg = _handler.obtainMessage();

                msg.what = 0; 

                try 

                {

                    msg.obj=new String(buffer,"UTF-8");

                } catch (UnsupportedEncodingException e) 

                {

                }

                _handler.sendMessage(msg);

            }

        }

    }

    public void Send(String _value) throws IOException

    {

        _outStream.write(_value.getBytes());

    }

    public void Close() throws IOException

    {

        IsConnect = false;

        _socket.close();

    }

}

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public void btnDevice_Click(View v)//选择设备

{

    final DeviceActivity _deviceDialog = new DeviceActivity(this);

    _deviceDialog.onConfirmListener = new  OnConfirmListener() 

    {

        @Override

        public void confirm(BluetoothDevice device)

        {

            _device = device;

            txtDevice.setText(device.getName()+"\n"+device.getAddress());

            _deviceDialog.dismiss();

            btnConnect.setText("连接设备");

            btnConnect.setVisibility(View.VISIBLE);

            btnSend.setVisibility(View.INVISIBLE);

        }

    };

    _deviceDialog.show();

}

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public void btnConnect_Click(View v)//连接设备

{

      _session = new Session(_device,_handler);

      setTitle(_session.Name);

      _session.connect();

      if (_session.IsConnect)

      {

          _session.start();

          btnConnect.setVisibility(View.INVISIBLE);

          btnSend.setVisibility(View.VISIBLE);

          btnSend.setText("发送消息");

    }

      else

      {

          Toast.makeText(MainActivity.this,

                  "连接失败",

                  Toast.LENGTH_LONG).show();

          btnSend.setVisibility(View.INVISIBLE);

    }

}

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Handler _handler=new Handler(Looper.getMainLooper())

{

    @Override

    public void handleMessage(Message msg)

    {

        super.handleMessage(msg);

        edxMessage.setText(edxMessage.getText()+"\n"+msg.obj);

    }

};

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public void btnSend_Click(View v)//发送消息

{

      try

      {

        _session.Send(edxContent.getText().toString());

    } catch (IOException e) 

      {

        Toast.makeText(MainActivity.this,

                  "发送失败",

                  Toast.LENGTH_LONG).show();

    }

}