Question

以前，我使用插件Bluetooth LE plugin for Xamarin添加了代码以扫描ble设备。它已经工作了一段时间，但是我已经更新到了最新版本的Xamarin和Visual Studio，现在它只返回列表中的0个设备。我正在使用Android版本8.1进行编译。我的代码有问题还是更新有问题？

using System;

using Android.App;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Plugin.BLE;
using Plugin.BLE.Abstractions.Exceptions;
using System.Collections.Generic;
using Android.Bluetooth;
using Whale_Watch.Droid;

namespace Whale_Watch.Droid
{
    [Activity(Label = "BLE_Test",  Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected async override void OnCreate(Bundle bundle)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(bundle);

            global::Xamarin.Forms.Forms.Init(this, bundle);
            LoadApplication(new App());
            await scanAsync();
        }
        public async System.Threading.Tasks.Task scanAsync()
        {          
            List<Plugin.BLE.Abstractions.Contracts.IDevice> deviceList = new List<Plugin.BLE.Abstractions.Contracts.IDevice>();
            var ble = CrossBluetoothLE.Current;
            var adapter = CrossBluetoothLE.Current.Adapter;
            var state = ble.State;
            ble.StateChanged += (s, e) =>
            {
            };
            adapter.DeviceDiscovered += (s, a) => deviceList.Add(a.Device);
            await adapter.StartScanningForDevicesAsync();
        }      
    }
}

BLE不在Xamarin中扫描

0 个答案: