Android 蓝牙开发 ( 一 开启蓝牙 , 扫码周边设备)

Android 蓝牙开发

一 配置环境

在 AndroidMainifest.xml 中配置下面的权限

    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
  ## 有关于 定位权限的也需要加上
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-feature android:name="android.hardware.location.gps" />

基础类

通过下面的方法 获取系统的 蓝牙适配器

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
            // 设备不支持蓝牙 -- 没得玩了.. 
            System.out.println("设备不支持蓝牙");
            return;
}

权限检测

if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // 权限未授予，请求权限
            ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_BLUETOOTH_SCAN_PERMISSION);
        } else {
            // 权限已授予，执行蓝牙扫描相关的操作
            System.out.println("开启了蓝牙扫描");
            bluetoothAdapter.startDiscovery();
        }

异常情况处理

enableBtLauncher = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(),
                result -> {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        // 在蓝牙已启用时执行的操作
                        System.out.println("在蓝牙已启用时执行的操作");
                        bluetoothAdapter.startDiscovery();
                    } else {
                        // 在蓝牙未启用时执行的操作
                        System.out.println("在蓝牙未启用时执行的操作");
                        /// 不开启蓝牙 -- 没得玩哦
                    }
                });

        if (!bluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            enableBtLauncher.launch(enableBtIntent);
        }

注册广播 接受蓝牙搜索结果

 // 创建BroadcastReceiver以接收蓝牙设备的搜索结果
        receiver = new BroadcastReceiver() {
            @SuppressLint({"RestrictedApi", "MissingPermission"})
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                    // 当找到设备时
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    // 处理设备
                    System.out.println(device.getName());
                }
            }
        };

        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        getContext().registerReceiver(receiver, filter);