代碼很簡單，直接一個布局文件和一個activity。需要的朋友可以直接將這兩部分粘貼復制到項目中即可。

Activity部分：

package com.anhua.bluetooth;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.UUID;
import com.example.imooc_weixinfragment.R;
 
import android.app.Activity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
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.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
 
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class BluetoothActivity extends Activity implements OnClickListener {

    private ListView unbondDevices = null;
    private ListView bondDevices = null;
    private Context context = null;
    private BluetoothAdapter bluetoothAdapter = BluetoothAdapter
            .getDefaultAdapter();
    private ArrayList<BluetoothDevice> unbondDeviceslist = null; // 用於存放未配對藍牙設備
    private ArrayList<BluetoothDevice> bondDeviceslist = null;// 用於存放已配對藍牙設備
    private ListView unbondDevicesListView = null;
    private ListView bondDevicesListView = null;
    private Button searchDevices;// 搜索藍牙設備Button
    private TextView deviceName;// 藍牙設備的名字
    private TextView connectState = null;//藍牙設備連接狀態
    private String address;// 藍牙地址
    private ImageView returnButton;
    private boolean isConnection = false;
    private BluetoothDevice devices = null;
    private static BluetoothSocket bluetoothSocket = null;
    private static final UUID uuid = UUID
            .fromString("00001101-0000-1000-8000-00805F9B34FB");
    private static OutputStream outputStream = null;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.context = this;
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.bluetooth_layout);
        unbondDeviceslist = new ArrayList<BluetoothDevice>();
        bondDeviceslist = new ArrayList<BluetoothDevice>();
        this.initIntentFilter();
        initView();
        init();
    }

    private void init() {
        deviceName=(TextView) findViewById(R.id.device_name);
        connectState=(TextView) findViewById(R.id.connect_state);
        unbondDevices = (ListView) this.findViewById(R.id.unbondDevices);
        bondDevices = (ListView) this.findViewById(R.id.bondDevices);
        searchDevices = (Button) this.findViewById(R.id.searchDevices);
        unbondDevicesListView = (ListView) findViewById(R.id.unbondDevices);
        bondDevicesListView = (ListView) findViewById(R.id.bondDevices);
        returnButton = (ImageView) this.findViewById(R.id.return_Bluetooth_btn);
        this.setSearchDevices(searchDevices);
        searchDevices.setOnClickListener(this);
        returnButton.setOnClickListener(this);
    }

    public void setSearchDevices(Button searchDevices) {
        this.searchDevices = searchDevices;
    }

    /**
     * 初始化界面
     */
    public void initView() {

        if (this.isOpen()) {
            System.out.println("藍牙有開!");
        }
        if (!this.isOpen()) {
            System.out.println("藍牙沒開!");
            this.searchDevices.setEnabled(false);
        }
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        this.disconnect();
        super.onDestroy();
    }

    /**
     * 添加已綁定藍牙設備到ListView
     */
    private void addBondDevicesToListView() {
        ArrayList<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
        int count = this.bondDeviceslist.size();
        System.out.println("已綁定設備數量：" + count);
        for (int i = 0; i < count; i++) {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("deviceName", this.bondDeviceslist.get(i).getName());
            data.add(map);// 把item項的數據加到data中
        }
        String[] from = { "deviceName" };
        int[] to = { R.id.device_name };
        SimpleAdapter simpleAdapter = new SimpleAdapter(this.context, data,
                R.layout.bonddevice_item, from, to);
        // 把適配器裝載到listView中
        this.bondDevicesListView.setAdapter(simpleAdapter);

        this.bondDevicesListView
                .setOnItemClickListener(new OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> arg0, View arg1,
                            int arg2, long arg3) {
                        deviceName.setVisibility(View.VISIBLE);
                        connectState.setVisibility(View.VISIBLE);
                        BluetoothDevice device = bondDeviceslist.get(arg2);
                        address = device.getAddress();// 獲取藍牙地址
                        devices=bluetoothAdapter.getRemoteDevice(address);
                        
                        deviceName.setText(getDeviceName());
                        // 一上來就先連接藍牙設備
                        boolean flag = connect();
                        if (flag == false) {
                            // 連接失敗
                            connectState.setText("連接失敗！");
                        } else {
                            // 連接成功
                            connectState.setText("連接成功！");
                        }
                    }
                });
    }

    /**
     * 添加未綁定藍牙設備到ListView
     */
    private void addUnbondDevicesToListView() {
        ArrayList<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
        int count = this.unbondDeviceslist.size();
        System.out.println("未綁定設備數量：" + count);
        for (int i = 0; i < count; i++) {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("deviceName", this.unbondDeviceslist.get(i).getName());
            data.add(map);// 把item項的數據加到data中
        }
        String[] from = { "deviceName" };
        int[] to = { R.id.undevice_name };
        SimpleAdapter simpleAdapter = new SimpleAdapter(this.context, data,
                R.layout.unbonddevice_item, from, to);

        // 把適配器裝載到listView中
        unbondDevicesListView.setAdapter(simpleAdapter);

        // 為每個item綁定監聽，用於設備間的配對
        unbondDevicesListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                try {
                    Method createBondMethod = BluetoothDevice.class
                            .getMethod("createBond");
                    createBondMethod.invoke(unbondDeviceslist.get(arg2));
                    // 將綁定好的設備添加的已綁定list集合
                    bondDeviceslist.add(unbondDeviceslist.get(arg2));
                    // 將綁定好的設備從未綁定list集合中移除
                    unbondDeviceslist.remove(arg2);
                    addBondDevicesToListView();
                    addUnbondDevicesToListView();
                } catch (Exception e) {
                    Toast.makeText(context, "配對失敗！", Toast.LENGTH_SHORT).show();
                }

            }
        });
    }

    private void initIntentFilter() {
        // 設置廣播信息過濾
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
        intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
        intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
        // 註冊廣播接收器，接收並處理搜索結果
        context.registerReceiver(receiver, intentFilter);

    }

    /**
     * 打開藍牙
     */
    public void openBluetooth(Activity activity) {
        Intent enableBtIntent = new Intent(
                BluetoothAdapter.ACTION_REQUEST_ENABLE);
        activity.startActivityForResult(enableBtIntent, 1);

    }

    /**
     * 關閉藍牙
     */
    public void closeBluetooth() {
        this.bluetoothAdapter.disable();
    }

    /**
     * 判斷藍牙是否打開
     * 
     * @return boolean
     */
    public boolean isOpen() {
        return this.bluetoothAdapter.isEnabled();

    }

    /**
     * 搜索藍牙設備
     */
    public void searchDevices() {
        this.bondDeviceslist.clear();
        this.unbondDeviceslist.clear();

        // 尋找藍牙設備，android會將查找到的設備以廣播形式發出去
        this.bluetoothAdapter.startDiscovery();
    }

    /**
     * 添加未綁定藍牙設備到list集合
     * 
     * @param device
     */
    public void addUnbondDevices(BluetoothDevice device) {
        System.out.println("未綁定設備名稱：" + device.getName());
        if (!this.unbondDeviceslist.contains(device)) {
            this.unbondDeviceslist.add(device);
        }
    }

    /**
     * 添加已綁定藍牙設備到list集合
     * 
     * @param device
     */
    public void addBandDevices(BluetoothDevice device) {
        System.out.println("已綁定設備名稱：" + device.getName());
        if (!this.bondDeviceslist.contains(device)) {
            this.bondDeviceslist.add(device);
        }
    }

    /**
     * 藍牙廣播接收器
     */
    private BroadcastReceiver receiver = new BroadcastReceiver() {

        ProgressDialog progressDialog = null;

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent
                        .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
                    addBandDevices(device);
                } else {
                    addUnbondDevices(device);
                }
            } else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
                progressDialog = ProgressDialog.show(context, "請稍等...",
                        "搜索藍牙設備中...", true);

            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED
                    .equals(action)) {
                System.out.println("設備搜索完畢");
                progressDialog.dismiss();

                addUnbondDevicesToListView();
                addBondDevicesToListView();
            }
        }
    };
    /**
     * 獲取設備名稱
     * 
     * @return String
     */
    public String getDeviceName() {
        return devices.getName();
    }
    /**
     * 連接藍牙設備
     */
    public boolean connect() {
        if (!this.isConnection) {
            try {
                bluetoothSocket = this.devices
                        .createRfcommSocketToServiceRecord(uuid);
                bluetoothSocket.connect();
                outputStream = bluetoothSocket.getOutputStream();
                this.isConnection = true;
                if (this.bluetoothAdapter.isDiscovering()) {
                    System.out.println("關閉適配器！");
                    this.bluetoothAdapter.isDiscovering();
                }
            } catch (Exception e) {
                Toast.makeText(this.context, "連接失敗！", 1).show();
                return false;
            }
            Toast.makeText(this.context, this.devices.getName() + "連接成功！",
                    Toast.LENGTH_SHORT).show();
            return true;
        } else {
            return true;
        }
    }
    /**
     * 斷開藍牙設備連接
     */
    public static void disconnect() {
        System.out.println("斷開藍牙設備連接");
        try {
            bluetoothSocket.close();
            outputStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.searchDevices:
            this.searchDevices();
            break;
        case R.id.return_Bluetooth_btn:
            finish();
            break;
        default:
            break;
        }
    }
}

布局文件部分：

<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:background="@drawable/index"
    tools:context=".BluetoothActivity" >

    <LinearLayout
        android:id="@+id/openBluetooth_tb"
        android:layout_width="match_parent"
        android:layout_height="44dp"
        android:background="#24cf5f"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/return_Bluetooth_btn"
            android:layout_width="match_parent"
            android:layout_height="20dp"
            android:layout_gravity="center"
            android:layout_weight="5"
            android:src="@drawable/back"/>

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="44dp"
            android:layout_weight="1"
            android:gravity="center"
            android:paddingRight="40dp"
            android:text="@string/titie_activity_conn_blue_list"
            android:textColor="#FFFFFF"
            android:textSize="30px" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/openBluetooth_tb"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <TextView
                android:visibility="gone"
                android:id="@+id/device_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="名稱"
                android:textAppearance="?android:attr/textAppearanceLarge" />

            <TextView
                android:visibility="gone"
                android:id="@+id/connect_state"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="42dp"
                android:text="狀態"
                android:textAppearance="?android:attr/textAppearanceLarge" />
        </LinearLayout>

        <Button
            android:id="@+id/searchDevices"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="搜索設備" />
         <View
        android:layout_width="match_parent"
        android:layout_height="3dp"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/searchDevices"
        android:background="@android:color/darker_gray" />
        
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:orientation="vertical" >

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="未配對設備" />

        <ListView
            android:id="@+id/unbondDevices"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>
          <View
        android:layout_width="match_parent"
        android:layout_height="3dp"
        android:layout_alignParentLeft="true"
        android:background="@android:color/darker_gray" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="190dp"
        android:orientation="vertical" >

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="已配對設備" />

        <ListView
            android:id="@+id/bondDevices"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/linearLayout1" >
        </ListView>
    </LinearLayout>
    </LinearLayout>

</RelativeLayout>

通過以上兩部分就可以實現連接藍牙打印機的功能。

Android開發之藍牙連接打印機