1. 确认蓝牙权限是否已经授予。在AndroidManifest.xml文件中添加以下权限：

2. 创建蓝牙适配器对象并检查蓝牙是否已经打开：

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (mBluetoothAdapter == null) { // 设备不支持蓝牙 } else { if (!mBluetoothAdapter.isEnabled()) { // 请求打开蓝牙设备 Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); } }

3. 扫描蓝牙设备，连接匹配的设备：

mBluetoothAdapter.startDiscovery();

// 注册 BroadcastReceiver 监听发现设备
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        // 在发现设备时
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            // 从 Intent 中获取蓝牙设备对象
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            // 如果是要查找的设备，则连接
            if (device.getName().equals("DEVICE_NAME")) {
                ConnectThread connectThread = new ConnectThread(device);
                connectThread.start();
                mBluetoothAdapter.cancelDiscovery();
            }
        }
    }
};
// ......
// 在Activity的onResume()方法中注册 BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
// ...... 

4. 创建蓝牙线程连接和通信：

private class ConnectThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final BluetoothDevice mmDevice;
 
    public ConnectThread(BluetoothDevice device) {
        BluetoothSocket tmp = null;
        mm