基于Androidstudio的蓝牙通信代码

以下是一个基于 Android Studio 的蓝牙通信示例代码：

1. 在 AndroidManifest.xml 文件中添加以下权限：

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

2. 在 layout 文件夹中创建一个布局文件 activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Button
        android:id="@+id/button_search"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Search Devices"/>

    <ListView
        android:id="@+id/list_devices"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/button_send"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Send Data"/>

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

3. 创建一个 BluetoothAdapter 对象以进行蓝牙通信。在 MainActivity.java 文件中添加以下代码：

public class MainActivity extends AppCompatActivity {

    private BluetoothAdapter bluetoothAdapter;
    private ArrayAdapter<String> devicesArrayAdapter;
    private ListView listView;
    private EditText editText;
    private Button buttonSearch, buttonSend;
    private BluetoothDevice device;
    private BluetoothSocket socket;

    private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

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

        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        // Check if the device supports Bluetooth
        if (bluetoothAdapter == null) {
            Toast.makeText(getApplicationContext(), "Bluetooth not supported", Toast.LENGTH_LONG).show();
            finish();
            return;
        }

        // Check if Bluetooth is enabled
        if (!bluetoothAdapter.isEnabled()) {
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, 0);
        }

        // Initialize UI components
        listView = findViewById(R.id.list_devices);
        editText = findViewById(R.id.edit_text);
        buttonSearch = findViewById(R.id.button_search);
        buttonSend = findViewById(R.id.button_send);

        devicesArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);
        listView.setAdapter(devicesArrayAdapter);

        buttonSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                searchDevices();
            }
        });

        buttonSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                sendData();
            }
        });
    }

    // Search for Bluetooth devices
    private void searchDevices() {
        devicesArrayAdapter.clear();
        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
        if (pairedDevices.size() > 0) {
            for (BluetoothDevice device : pairedDevices) {
                devicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
            }
        }

        // Start discovery of new devices
        bluetoothAdapter.startDiscovery();
        registerReceiver(discoveryReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
    }

    // Send data to the connected device
    private void sendData() {
        String data = editText.getText().toString();
        try {
            OutputStream outputStream = socket.getOutputStream();
            outputStream.write(data.getBytes());
            outputStream.flush();
            Toast.makeText(getApplicationContext(), "Data sent", Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Error sending data", Toast.LENGTH_LONG).show();
        }
    }

    // Broadcast receiver for discovering new devices
    private final BroadcastReceiver discoveryReceiver = 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);
                devicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
            }
        }
    };

    // Connect to the selected device
    private void connectToDevice(String deviceAddress) {
        device = bluetoothAdapter.getRemoteDevice(deviceAddress);
        try {
            socket = device.createRfcommSocketToServiceRecord(MY_UUID);
            socket.connect();
            Toast.makeText(getApplicationContext(), "Connected to " + device.getName(), Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Error connecting to device", Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(discoveryReceiver);
        try {
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

4. 您可以在 MainActivity.java 文件中添加其他方法，例如取消搜索、断开连接等。请注意，此示例代码仅用于演示目的，您需要根据自己的需求进行修改和完善。