Android在app中实现一个蓝牙服务Service的案例-摩杜云开发者社区

在这里，我将为你提供一个完整的 Android 服务示例 (BluetoothService)，该服务将连接到蓝牙设备并读取数据。首先，创建一个新的 Android 项目，然后按照以下步骤添加服务和相关代码：

1.创建 BluetoothService 类，该类将处理蓝牙连接和数据读取

创建一个新的 Android 项目，然后将下面代码添加到 BluetoothService.java 文件中。

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;

public class BluetoothService extends Service {
    private final IBinder binder = new LocalBinder();
    private BluetoothAdapter bluetoothAdapter;
    private BluetoothSocket bluetoothSocket;
    private InputStream inputStream;
    private boolean connected = false;

    // UUID 用于标识蓝牙串口服务 (SPP - Serial Port Profile)
    private static final UUID BT_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    public class LocalBinder extends Binder {
        BluetoothService getService() {
            return BluetoothService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return binder;
    }

    public boolean connectToDevice(String deviceAddress) {
        BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
        try {
            bluetoothSocket = device.createRfcommSocketToServiceRecord(BT_UUID);
            bluetoothSocket.connect();
            inputStream = bluetoothSocket.getInputStream();
            connected = true;
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
    }

    public String readData() {
        if (connected) {
            try {
                byte[] buffer = new byte[1024];
                int bytes = inputStream.read(buffer);
                return new String(buffer, 0, bytes);
            } catch (IOException e) {
                e.printStackTrace();
                return "Error reading data";
            }
        } else {
            return "Not connected to a Bluetooth device";
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        try {
            if (inputStream != null) {
                inputStream.close();
            }
            if (bluetoothSocket != null) {
                bluetoothSocket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2.修改AndroidManifest.xml 文件，添加必要的权限和声明服务

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

<application
    <!-- ... -->
    <service
        android:name=".BluetoothService"
        android:enabled="true"
        android:exported="false" />
</application>

3.创建 MainActivity 类，用于启动服务并读取蓝牙数据

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    private BluetoothService bluetoothService;
    private boolean serviceBound = false;
    private TextView dataTextView;
    private Button connectButton;
    private Button readDataButton;

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

        dataTextView = findViewById(R.id.dataTextView);
        connectButton = findViewById(R.id.connectButton);
        readDataButton = findViewById(R.id.readDataButton);

        // 绑定服务
        Intent serviceIntent = new Intent(this, BluetoothService.class);
        bindService(serviceIntent, serviceConnection, BIND_AUTO_CREATE);

        connectButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 连接到蓝牙设备
                if (serviceBound) {
                    boolean connected = bluetoothService.connectToDevice("蓝牙设备的地址");
                    if (connected) {
                        dataTextView.setText("Connected to Bluetooth device.");
                    } else {
                        dataTextView.setText("Connection failed.");
                    }
                }
            }
        });

        readDataButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 读取蓝牙数据
                if (serviceBound) {
                    String data = bluetoothService.readData();
                    dataTextView.setText("Data: " + data);
                }
            }
        });
    }

    private ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            BluetoothService.LocalBinder binder = (BluetoothService.LocalBinder) service;
            bluetoothService = binder.getService();
            serviceBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            serviceBound = false;
        }
    };

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (serviceBound) {
            unbindService(serviceConnection);
        }
    }
}

4.配置布局文件（省略）

在 res/layout 目录下创建一个 XML 布局文件 (例如 activity_main.xml)，并在该布局文件中添加布局元素，比如一些 TextView 和 Button，由于很简单所以就省略了

这样就创建了一个 Android 服务 (BluetoothService)，可以在 MainActivity 中启动该服务，连接到蓝牙设备，并读取数据。确保替换 "蓝牙设备的地址" 为你实际要连接的蓝牙设备的地址。在实际应用中，你可能需要添加更多的错误处理和逻辑，以适应你的具体需求。