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android实现蓝牙app的具体代码，具体内容如下

private BluetoothGatt bluetoothGatt;
private BluetoothGattService gattService;
private BluetoothGattCharacteristic gattCharacteristic;
private BluetoothManager bluetoothManager;
private BluetoothAdapter bluetoothAdapter;
private List devices = new ArrayList<>();

private UUID serviceUUID;  //不同设备 不同uuid
private UUID characteristicUUID;   //不同设备 不同uuid
private final UUID service4UUID= UUID.fromString("0000fff0-0000-1000-8000-00805f9b34fb");  
private final UUID charAUUID = UUID.fromString("0000fffa-0000-1000-8000-00805f9b34fb");

private LightReceiver lightReceiver;
private ScanReceiver scanReceiver;
private ListView listView;
private TextView tvrefresh;
private String lightAction;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  Log.i("tag", "MainActivity  onCreate()");
  //
  listView = (ListView) findViewById(R.id.lv_bluetooth);
  tvrefresh = (TextView) findViewById(R.id.tv_refresh_bluetooth);
  tvrefresh.setOnClickListener(this);
  openBluetooth();
  registeLigthReceiver();
  registeScanReceiver();

}

@Override
protected void onStart() {
  super.onStart();
  Log.i("tag", "MainActivity  onStart()");
  bluetoothScan();
}

//返回
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
  Log.i("tag", "MainActivity  onKeyUp()");
  this.finish();
  return super.onKeyUp(keyCode, event);
}

//重新扫描蓝牙
@Override
public void onClick(View view) {
  switch (view.getId()) {
    case R.id.tv_refresh_bluetooth:
      //蓝牙扫描
      bluetoothScan();
      break;
    default:
      break;
  }
}

//打开本地蓝牙
private void openBluetooth() {
  Log.i("tag", "openLocalBluetooth()");
  //检查手机是否支持蓝牙4.0
  if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
    Toast.makeText(this, "手机不支持蓝牙4.0", Toast.LENGTH_SHORT).show();
    finish();
  }
  //调用系统服务的方式，请求开启蓝牙
  bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
  bluetoothAdapter = bluetoothManager.getAdapter();
  //开启蓝牙
  if (!bluetoothAdapter.isEnabled()) {
    bluetoothAdapter.enable();
  }
}

//开始蓝牙扫描  扫描到一个添加一个
private void bluetoothScan() {
  Log.i("tag", "bluetoothScan()");
  if (bluetoothAdapter == null) {
    openBluetooth();
  }
  if (!bluetoothAdapter.isDiscovering()) {
    bluetoothAdapter.startDiscovery();  //回调
  } else {
    Toast.makeText(this, "扫描中..", Toast.LENGTH_SHORT).show();
  }
}

//更新蓝牙列表中的数据
private void updateUi() {
  Log.i("tag", "updateUi()");
  if (devices != null && devices.size() > 0) {
    BlueAdapter adapter = new BlueAdapter(this, devices);
    listView.setAdapter(adapter);
    adapter.notifyDataSetChanged();
  } else {
    Toast.makeText(this, "附近没有蓝牙", Toast.LENGTH_SHORT).show();
  }
}

//取得gatt 对应的service
private BluetoothGattService getGattService(BluetoothGatt gatt, UUID serviceUUID) {
  List gattServices = gatt.getServices();
  for (BluetoothGattService gattService : gattServices) {
    if (gattService.getUuid().equals(serviceUUID)) {
      return gattService;
    }
  }
  return null;
}

//取得service对应的characteristic
private BluetoothGattCharacteristic getGattCharacteristic(BluetoothGattService gattService, UUID characteristicUUID) {
  List gattCharacteristics = gattService.getCharacteristics();
  for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) {
    if (gattCharacteristic.getUuid().equals(characteristicUUID)) {
      return gattCharacteristic;
    }
  }
  return null;
}

//注册蓝牙扫描监听
private void registeScanReceiver() {
  Log.i("tag", "registeScanReceiver()");
  scanReceiver = new ScanReceiver();
  IntentFilter filter = new IntentFilter();
  filter.addAction(BluetoothDevice.ACTION_FOUND);
  filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
  registerReceiver(scanReceiver, filter);
}

//定义蓝牙扫描监听类 添加device ， 更新界面
class ScanReceiver extends BroadcastReceiver {

  @Override
  public void onReceive(Context context, Intent intent) {
    Log.i("tag", " BluetoothReceiver / ScanReceiver onReceive()  action=" + intent.getAction());
    String scanAction = intent.getAction();
    if (scanAction.equals(BluetoothDevice.ACTION_FOUND)) {
      BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
      if (!devices.contains(device)) {
        devices.add(device);
        if (CacheUtils.getBlueDeviceString(MainActivity1.this, device.getAddress()).equals("")) {
          CacheUtils.putBlueDeviceString(MainActivity1.this, device.getAddress(), device.getName());
        }
        updateUi();
      }
    } else if (scanAction.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {
      if (devices == null || devices.size() == 0) {
        Toast.makeText(MainActivity1.this, "附近没有发现蓝牙设备", Toast.LENGTH_SHORT).show();
      }
    }
  }
}

//注册灯光监听
private void registeLigthReceiver() {
  Log.i("tag", "registeReceiver()");
  lightReceiver = new LightReceiver();
  IntentFilter filter = new IntentFilter();
  filter.addAction("openLight");
  filter.addAction("closeLight");
  registerReceiver(lightReceiver, filter);
}

//定义灯控监听类
class LightReceiver extends BroadcastReceiver {

  @Override
  public void onReceive(Context context, Intent intent) {

    Log.i("tag", " BluetoothReceiver  /LightReceiver onReceive()  action=" + intent.getAction());
    //
    String address = intent.getStringExtra("bluetoothAddress");  //从adapter取得的数据
    lightAction = intent.getAction();
    // if()   不同设备  不同serviceUUID，不同的characteristicUUID 自己确定
    serviceUUID=service4UUID;
    characteristicUUID=charAUUID;

    if (bluetoothAdapter == null) {
      openBluetooth();
    }
    BluetoothDevice device = bluetoothAdapter.getRemoteDevice(address);  
    MyBluetoothGattCallback gattCallback = new MyBluetoothGattCallback();
    bluetoothGatt = device.connectGatt(MainActivity1.this, false, gattCallback);  //回调

  }
}

//蓝牙连接/通信回调
class MyBluetoothGattCallback extends android.bluetooth.BluetoothGattCallback {
  @Override
  public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
    super.onConnectionStateChange(gatt, status, newState);
    Log.i("tag", "MyBluetoothGattCallback  onConnectionStateChange()  newState=" + newState);
    if (newState == BluetoothProfile.STATE_CONNECTED) {
      gatt.discoverServices();       //连接成功，开始搜索服务，一定要调用此方法，否则获取不到服务
      Log.i("tag", "MyBluetoothGattCallback  STATE_CONNECTED  ");
    } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
      Log.i("tag", "MyBluetoothGattCallback  STATE_DISCONNECTED");
    }
  }

  @Override
  public void onServicesDiscovered(BluetoothGatt gatt, int status) {
    super.onServicesDiscovered(gatt, status);
    Log.i("tag", "MyBluetoothGattCallback  onServicesDiscovered() status=" + status);

    if (lightAction.equals("openLight") || lightAction.equals("closeLight")) {  //避免 不停更新
      if (gattService == null || gattCharacteristic == null || !serviceUUID.equals(service4UUID) || !characteristicUUID.equals(charAUUID)) {
        gattService = getGattService(gatt, serviceUUID);
        if (gattService != null) {
          gattCharacteristic = getGattCharacteristic(gattService, characteristicUUID);
          if (gattCharacteristic != null) {
            gatt.setCharacteristicNotification(gattCharacteristic, true);
            gatt.connect();
          }
        }
      }
      if (lightAction.equals("openLight")) {
        gattCharacteristic.setValue("openLight"); //这里自己设置 蓝牙模组需要的数据
        gatt.writeCharacteristic(gattCharacteristic);
      } else if (lightAction.equals("closeLight")) {
        gattCharacteristic.setValue("closeLight"); //这里自己设置 蓝牙模组需要的数据
        gatt.writeCharacteristic(gattCharacteristic);
      }
      lightAction = "";
      gatt.readRemoteRssi();
    }
  }
}

@Override
protected void onDestroy() {
  super.onDestroy();
  Log.i("tag", "onDestroy()");
  if (bluetoothAdapter != null) {
    bluetoothAdapter.disable();
    bluetoothAdapter = null;
  }
  if (bluetoothGatt != null) {
    bluetoothGatt.disconnect();
    bluetoothGatt.close();
    bluetoothGatt = null;
  }

  if (lightReceiver != null) {
    unregisterReceiver(lightReceiver);
    lightReceiver = null;
  }
  if (scanReceiver != null) {
    unregisterReceiver(scanReceiver);
    scanReceiver = null;
  }
}

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