Maui控制蓝牙

安卓
安卓蓝牙权限在AndroidManifest.xml文件中设置。在安卓设备上开启程序的位置获取权限。

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<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> // 蓝牙扫描需要开启

使用包InTheHand.Bluetooth.Permissions检查权限，代码var state = await Permissions.RequestAsync<InTheHand.Bluetooth.Permissions.Bluetooth>();。
检查蓝牙是否打开。

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#if ANDROID

            var bluetoothManager = (Android.Bluetooth.BluetoothManager)Android.App.Application.Context.GetSystemService(Android.Content.Context.BluetoothService);
            if (bluetoothManager != null)
            {
                var bluetoothAdapter = bluetoothManager.Adapter;
                if (bluetoothAdapter != null && bluetoothAdapter.IsEnabled == false)
                {
                    bluetoothAdapter.Enable();
                    //var enable = new Android.Content.Intent(Android.Bluetooth.BluetoothAdapter.ActionRequestEnable);
                    //enable.SetFlags(Android.Content.ActivityFlags.NewTask);
                    //Android.App.Application.Context.StartActivity(enable);
                }
            }
#endif

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#if ANDROID

        var bluetoothManager = (Android.Bluetooth.BluetoothManager)Android.App.Application.Context.GetSystemService(Android.Content.Context.BluetoothService);
        var bluetoothAdapter = bluetoothManager.Adapter;
        if(bluetoothAdapter.IsEnabled == true )
        {
            bluetoothAdapter.Disable();
        }
        else
        {
            bluetoothAdapter.Enable();
        }
#endif

You can use the following code after requesting the permission and it work on all the android versions:

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#if ANDROID
        var enable = new Android.Content.Intent(
                    Android.Bluetooth.BluetoothAdapter.ActionRequestEnable);
        enable.SetFlags(Android.Content.ActivityFlags.NewTask);

        var disable = new Android.Content.Intent(
                    Android.Bluetooth.BluetoothAdapter.ActionRequestDiscoverable);
        disable.SetFlags(Android.Content.ActivityFlags.NewTask);

          var bluetoothManager = (Android.Bluetooth.BluetoothManager)Android.App.Application.Context.GetSystemService(Android.Content.Context.BluetoothService);
          var bluetoothAdapter = bluetoothManager.Adapter;
          if(bluetoothAdapter.IsEnabled == true )
          {
            Android.App.Application.Context.StartActivity(disable);
            //  disable the bluetooth;
        }
        else
          {
            // enable the bluetooth
            Android.App.Application.Context.StartActivity(enable);

        }
#endif

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