android studio蓝牙连接代码

以下是一个简单的 Android Studio 蓝牙连接代码示例：

1. 首先需要声明权限

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

2. 在 onCreate 方法中获取 BluetoothAdapter 实例并启用蓝牙

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

3. 在 onActivityResult 方法中处理启用蓝牙的结果

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_ENABLE_BT) {
        if (resultCode == RESULT_OK) {
            // 蓝牙已启用
        } else {
            // 用户拒绝启用蓝牙
        }
    }
}

4. 扫描可用的蓝牙设备

private void scanForDevices() {
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (bluetoothAdapter.isDiscovering()) {
        bluetoothAdapter.cancelDiscovery();
    }
    bluetoothAdapter.startDiscovery();
    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    registerReceiver(receiver, filter);
}

private final BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            // 处理扫描到的设备
        }
    }
};

5. 连接蓝牙设备

private void connectToDevice(BluetoothDevice device) {
    BluetoothSocket socket = null;
    try {
        socket = device.createRfcommSocketToServiceRecord(MY_UUID);
        socket.connect();
        // 连接成功，处理数据传输
    } catch (IOException e) {
        // 连接失败
    }
}

以上是一个简单的蓝牙连接代码示例，具体实现还需要根据具体情况进行调整。