蓝牙的使用

工程结构图：
[img]
[img]http://dl.iteye.com/upload/attachment/0063/5990/4fd677fa-c81c-3d8d-beb4-2def5ae4caad.jpg[/img]
[/img]

MainActivity

package com.zzl.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button btn = (Button) findViewById(R.id.button1);

        btn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Intent intent = new Intent(getApplication(),BTConnectActivity.class);
				startActivity(intent);
				finish();
			}
		});
    }
}

BTConnectActivity

package com.zzl.test;

/*************************************************************/
/* Project Shmimn 
 *  Mobile Health-care Device
 *  Yuhua Chen
 *  2011-4-24 16:35:21
 */
/*************************************************************/
import java.io.IOException;
import java.util.UUID;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.content.Intent;
import android.content.Context;
import android.content.BroadcastReceiver;
import android.content.IntentFilter;

import android.widget.AdapterView;

import android.widget.ListView;
import android.widget.ArrayAdapter;

import android.widget.Toast;
import android.util.Log;
import android.view.View;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
public class BTConnectActivity extends Activity {

	// private static final String TAG = "BTConnectActivity";

	/** Called when the activity is first created. */
	public static final int REQUEST_ENABLE_BT = 8807;
	public BroadcastReceiver mBTReceiver;
	public static BluetoothSocket mBTSocket;
	public BluetoothAdapter mBTAdapter;
	public BluetoothDevice mBTDevice;
	private ArrayAdapter<String> adtDvcs;
	private List<String> lstDvcsStr = new ArrayList<String>();
	private ListView lvDevicesList;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.btconnect);


		// 初始化 BluetoothAdapter
		mBTAdapter = BluetoothAdapter.getDefaultAdapter(); // c

		if (mBTAdapter == null) {
			Toast.makeText(BTConnectActivity.this, "没有支持蓝牙的设备! ",
					Toast.LENGTH_SHORT).show();
			this.finish();
		}
		if (!mBTAdapter.isEnabled()) {
			// Open a new dialog to ask user whether wanna open BT
			Toast.makeText(BTConnectActivity.this, "请打开手机蓝牙后再重试! ",
					Toast.LENGTH_SHORT).show();
			this.finish();

			Intent enabler = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
			startActivityForResult(enabler, REQUEST_ENABLE_BT);
		}
		// 开启 BroadCast Receiver
		mBTReceiver = new BroadcastReceiver() {
			public void onReceive(Context context, Intent intent) {
				String act = intent.getAction();
				// To see whether the action is that already found devices
				if (act.equals(BluetoothDevice.ACTION_FOUND)) {
					// 如果发现一个设备，得到设备的对象


					BluetoothDevice tmpDvc = intent
							.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
					// Put the name & address into a string
					String tmpDvcStr = tmpDvc.getName() + "|"
							+ tmpDvc.getAddress();
					if (lstDvcsStr.indexOf(tmpDvcStr) == -1) {
						// Avoid duplicate add devices
						lstDvcsStr.add(tmpDvcStr);
						adtDvcs.notifyDataSetChanged();
						Toast.makeText(BTConnectActivity.this, "发现一个新设备",
								Toast.LENGTH_SHORT).show();
					}
				}
				if (act.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {
					Toast.makeText(BTConnectActivity.this, "搜索完成!",
							Toast.LENGTH_SHORT).show();
				}

				if (act.equals(BluetoothAdapter.ACTION_DISCOVERY_STARTED)) {
					Toast.makeText(BTConnectActivity.this, "开始搜索设备",
							Toast.LENGTH_SHORT).show();
				}
			}
		};

		// 注册 broadcastReceiver
		IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
		registerReceiver(mBTReceiver, filter);
		filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
		registerReceiver(mBTReceiver, filter);
		filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
		registerReceiver(mBTReceiver, filter);

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

		adtDvcs = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, lstDvcsStr);
		lvDevicesList.setAdapter(adtDvcs);

		if (mBTAdapter.isDiscovering()) {
			Toast.makeText(BTConnectActivity.this, "正在搜索......",
					Toast.LENGTH_SHORT).show();
		} else {
			lstDvcsStr.clear();
			adtDvcs.notifyDataSetChanged();
			mBTDevice = null;
			mBTAdapter.startDiscovery();
		}

		// 在设备列表中创建单击事件
		lvDevicesList
				.setOnItemClickListener(new AdapterView.OnItemClickListener() {
					public void onItemClick(AdapterView<?> arg0, View arg1,
							int arg2, long arg3) {
						if (mBTAdapter == null)
							Toast.makeText(BTConnectActivity.this, "没有搜索到蓝牙设备",
									Toast.LENGTH_SHORT).show();
						else {
							// 停止搜索
							mBTAdapter.cancelDiscovery();
							// 得到设备的地址
							String str = lstDvcsStr.get(arg2);
							String[] dvcValues = str.split("\\|");
							String dvcAddr = dvcValues[1];
							UUID dvcUUID = UUID
									.fromString("00001101-0000-1000-8000-00805F9B34FB");
							mBTDevice = mBTAdapter.getRemoteDevice(dvcAddr);
							// 连接设备
							try {
								// 根据UUID创建并返回一个BluetoothSocket
								mBTSocket = mBTDevice
										.createRfcommSocketToServiceRecord(dvcUUID);
								mBTSocket.connect();

								Intent intent = new Intent(getApplicationContext(),WriteActivity.class);
								startActivity(intent);


							} catch (IOException e) {
								e.printStackTrace();
							}
						}
					}
				});
	}

	public void onActivityResult(int RequestCode, int ResultCode, Intent data) {
		Log.i("BTConnectActivity", "RequestCode is " + RequestCode
				+ ", ResultCode is " + ResultCode);
		switch (RequestCode) {
		case REQUEST_ENABLE_BT:
			if (ResultCode == RESULT_OK) {
				Toast.makeText(this.getApplicationContext(), "蓝牙已连接!",
						Toast.LENGTH_SHORT).show();
			} else if (ResultCode == RESULT_CANCELED) {
				Toast.makeText(this.getApplicationContext(), "蓝牙连接被取消!",
						Toast.LENGTH_SHORT).show();
			}
			break;
		}
	}

	@Override
	protected void onDestroy() {
		try {
			mBTSocket.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		this.unregisterReceiver(mBTReceiver);
		super.onDestroy();
	}
}

[/code]


WriteActivity
[code="java"]package com.zzl.test;
import android.app.Activity;
import android.content.Intent;
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.Button;
import android.widget.TextView;
import android.widget.Toast;

public class WriteActivity extends Activity {


	private TextView tv;
	private BTReadThread mReadThread = new BTReadThread(50);
	private boolean enRead = false; 
	private Handler handler = new Handler() {

		@Override
		public void handleMessage(Message msg) {

			switch (msg.what) {
			case 0:
				tv.setText(msg.obj.toString());
				break;
			}
		}
	};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.write);
        tv = (TextView) findViewById(R.id.tv);
        btint();

    }


    /**
	 * 开启读取蓝牙数据的线程
	 */
	private void btint() {
		try {
			if (BTConnectActivity.mBTSocket.getInputStream() != null) {
				enRead = true;
				mReadThread.start();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}


	/***
	 * 蓝牙操作
	 */
	class BTReadThread extends Thread {
		private int wait = 50;// Time to wait

		public BTReadThread(int wait) {
			this.wait = wait;
		}

		public void stopThread(){
			enRead = false;
		}

		public void run() {
			while (enRead) {
				try {
					if (BTConnectActivity.mBTSocket.getInputStream() != null) {
						byte[] tmp = new byte[1024];
						int len = BTConnectActivity.mBTSocket.getInputStream().read(tmp, 0, 1024); // 卡

						if (len > 0) {

							String res = "";
							for (int i = 0; i < tmp.length; i++) {
								String hex = Integer.toHexString(tmp[i] & 0xFF);
								if (hex.length() == 1) {
									hex = '0' + hex;
								}
								res += hex.toUpperCase();
							}

							String strDES = res.substring(0, 16);

							Message message = handler.obtainMessage();
							message.what = 0;
							message.obj = strDES;
							handler.sendMessage(message);
						}
					}
					Thread.sleep(wait);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	}
}

记得添加权限：
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />