蓝牙所需的权限

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

启动蓝牙

Intent intent = new Intent();
intent.setAction(BluetoothAdapter.ACTION_REQUEST_ENABLE);//启动蓝牙
intent.setAction(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);//被别人扫描到
startActivity(intent);

关闭蓝牙

//获得本机蓝牙设备
BluetoothAdapter defaultAdapter = BluetoothAdapter.getDefaultAdapter();
//关闭本机蓝牙设备
defaultAdapter.disable();

获取本机蓝牙信息

//首先先获取本机蓝牙设备
BluetoothAdapter defaultAdapter = BluetoothAdapter.getDefaultAdapter();
//获得本机蓝牙名称
String name = defaultAdapter.getName();
String address = defaultAdapter.getAddress();

扫描附近的蓝牙

//首先先获得自己的本机蓝牙适配器
BluetoothAdapter defaultAdapter = BluetoothAdapter.getDefaultAdapter();
//调用方法开始扫描
defaultAdapter.startDiscovery();//开始扫描

扫描到别的蓝牙设备后系统会发送广播，所以要有广播接收者

//广播接收者接受扫描到的蓝牙设备
class MyReceiver extends BroadcastReceiver{
   @Override
 	public void onReceive(Context context, Intent intent) {
      	if (intent.getAction().equals(BluetoothDevice.ACTION_FOUND)){
          //获得扫描到的远程设备
          BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
      	}
    }
}

查看已配对蓝牙的设备

//获得本机蓝牙适配器对象
BluetoothAdapter defaultAdapter = BluetoothAdapter.getDefaultAdapter();
//调用方法获得已经配对的集合
Set<BluetoothDevice> bondedDevices = defaultAdapter.getBondedDevices();
for (BluetoothDevice bond: bondedDevices) {
    Log.i("---","配对："+bond.getName()+":"+bond.getAddress());
}

本文地址：https://blog.csdn.net/Ideal_of_life/article/details/107596600