帮我写一个蓝牙接收APP

好的，以下是一个简单的蓝牙接收APP的示例代码，你可以根据自己的需求进行修改和扩展：

public class BluetoothReceiverActivity extends AppCompatActivity {

    private BluetoothAdapter bluetoothAdapter;
    private BluetoothSocket btSocket;
    private ConnectedThread connectedThread;

    private TextView textView;

    private static final UUID BT_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
    private static final String DEVICE_ADDRESS = "XX:XX:XX:XX:XX:XX";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bluetooth_receiver);

        textView = findViewById(R.id.textView);

        // 获取BluetoothAdapter实例
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        // 检查设备是否支持蓝牙
        if (bluetoothAdapter == null) {
            Toast.makeText(this, "设备不支持蓝牙", Toast.LENGTH_SHORT).show();
            finish();
            return;
        }

        // 检查蓝牙是否已开启
        if (!bluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
        } else {
            connectToDevice();
        }
    }

    private void connectToDevice() {
        // 获取远程设备
        BluetoothDevice device = bluetoothAdapter.getRemoteDevice(DEVICE_ADDRESS);

        // 创建BluetoothSocket连接
        try {
            btSocket = device.createRfcommSocketToServiceRecord(BT_UUID);
        } catch (IOException e) {
            Toast.makeText(this, "创建BluetoothSocket连接失败", Toast.LENGTH_SHORT).show();
            finish();
            return;
        }

        // 连接到BluetoothSocket
        try {
            btSocket.connect();
        } catch (IOException e) {
            try {
                btSocket.close();
            } catch (IOException e2) {
                // ignore
            }
            Toast.makeText(this, "连接失败", Toast.LENGTH_SHORT).show();
            finish();
            return;
        }

        // 开启接收线程
        connectedThread = new ConnectedThread(btSocket);
        connectedThread.start();
    }

    private class ConnectedThread extends Thread {
        private final InputStream inputStream;

        public ConnectedThread(BluetoothSocket socket) {
            InputStream tmpIn = null;

            try {
                tmpIn = socket.getInputStream();
            } catch (IOException e) {
                Toast.makeText(BluetoothReceiverActivity.this, "获取输入流失败", Toast.LENGTH_SHORT).show();
            }

            inputStream = tmpIn;
        }

        public void run() {
            byte[] buffer = new byte[1024];
            int bytes;

            while (true) {
                try {
                    bytes = inputStream.read(buffer);

                    final String message = new String(buffer, 0, bytes);

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            textView.setText(message);
                        }
                    });
                } catch (IOException e) {
                    break;
                }
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (connectedThread != null) {
            connectedThread.interrupt();
        }

        if (btSocket != null) {
            try {
                btSocket.close();
            } catch (IOException e) {
                // ignore
            }
        }
    }
}

请注意，上述代码仅为示例代码，尚未进行完整测试和优化，需要根据实际情况进行修改和完善。