1.官方网址 https://developer.android.com/guide/topics/connectivity/bluetooth.html

2.步骤

首先，添加蓝牙的权限

<manifest ... ><uses-permission android:name="android.permission.BLUETOOTH" /><uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>...
</manifest>
复制代码

2.1 打开蓝牙 第一种：引导用户收到打开 第二种：BLUETOOTH_ADMIN 可以用的mBluetoothAdapter.enable(); 直接打开

mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();// 蓝牙是否可用if (!mBluetoothAdapter.isEnabled()) {// 打开蓝牙mBluetoothAdapter.enable();}// 关闭蓝牙if (mBluetoothAdapter.isEnabled()) {mBluetoothAdapter.disable();}
复制代码

2.2 扫描附近可用的蓝牙设备 扫描到的结果会通过广播的形式回调，具体可以可以看附录代码：

          // 扫描蓝牙设备mBluetoothAdapter.cancelDiscovery();复制代码

2.3 连接接 2.4 发送指令 主要是

附录：

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.UUID;import android.app.Activity;
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.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;public class MainActivity extends Activity implements OnItemClickListener {private ListView mLv;private BluetoothAdapter mBluetoothAdapter;private OutputStream mOutputStream;private ArrayList<BluetoothDevice> mDevices = new ArrayList<BluetoothDevice>();private BroadcastReceiver mBluetoothReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (BluetoothDevice.ACTION_FOUND.equals(action)) {// 扫描到蓝牙设备BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);mDevices.add(device);mAdapter.notifyDataSetChanged();System.out.println("device name" + device.getName());} else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {Toast.makeText(getApplicationContext(), "开始扫描", Toast.LENGTH_SHORT).show();} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {Toast.makeText(getApplicationContext(), "扫描结束", Toast.LENGTH_SHORT).show();}}};private DeviceAdapter mAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mLv = (ListView) findViewById(R.id.lv);mAdapter = new DeviceAdapter(getApplicationContext(), mDevices);mLv.setAdapter(mAdapter);mLv.setOnItemClickListener(this);mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();// 注册广播接收者, 当扫描到蓝牙设备的时候, 系统会发送广播IntentFilter filter = new IntentFilter();filter.addAction(BluetoothDevice.ACTION_FOUND);filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);registerReceiver(mBluetoothReceiver, filter);}public void clickBtn(View v) {switch (v.getId()) {case R.id.button1:// 蓝牙是否可用if (!mBluetoothAdapter.isEnabled()) {// 打开蓝牙mBluetoothAdapter.enable();}break;case R.id.button2:// 关闭蓝牙if (mBluetoothAdapter.isEnabled()) {mBluetoothAdapter.disable();}break;case R.id.button3:// 开始扫描mDevices.clear();mAdapter.notifyDataSetChanged();mBluetoothAdapter.startDiscovery();break;case R.id.button4:// 停止扫描mBluetoothAdapter.cancelDiscovery();break;case R.id.button5:sendCtrl(0);break;case R.id.button6:sendCtrl(1);break;case R.id.button7:sendCtrl(2);break;default:break;}}private void sendCtrl(int i) {try {byte[] bs = new byte[5];bs[0] = (byte)0x01;bs[1] = (byte)0x99;if(i== 0) {bs[2] = (byte)0x10;bs[3] = (byte)0x10;}else if(i==1) {bs[2] = (byte)0x11;bs[3] = (byte)0x11;}else if(i==2) {bs[2] = (byte)0x17;bs[3] = (byte)0x17;}bs[4] = (byte)0x99;mOutputStream.write(bs);} catch (IOException e) {e.printStackTrace();}}@Overrideprotected void onDestroy() {super.onDestroy();unregisterReceiver(mBluetoothReceiver);}@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {BluetoothDevice device = mDevices.get(position);conn(device);}private void conn(final BluetoothDevice device) {// 建立蓝牙连接是耗时操作, 类似TCP Socket, 需要放在子线程里new Thread() {public void run() {try {// 获取 BluetoothSocket, UUID需要和蓝牙服务端保持一致BluetoothSocket bluetoothSocket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));// 和蓝牙服务端建立连接bluetoothSocket.connect();// 获取输出流, 往蓝牙服务端写指令信息mOutputStream = bluetoothSocket.getOutputStream();// 提示用户runOnUiThread(new Runnable() {public void run() {System.out.println("连接成功----");Toast.makeText(getApplicationContext(), "连接成功", Toast.LENGTH_SHORT).show();}});} catch (IOException e) {e.printStackTrace();}};}.start();}
}复制代码