bluetooth-lowenergy 相关问题

我正在尝试开发一个用于使用蓝牙连接设备的应用程序，我正在使用 Plugin.BLE 来实现此目的，但它显示了一些未处理的异常 AndroidManifest.xml 我正在尝试开发一个用于使用蓝牙连接设备的应用程序，我正在使用 Plugin.BLE 来实现此目的，但它显示了一些未处理的异常 AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"> <application android:allowBackup="true" android:supportsRtl="true"></application> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <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" /> </manifest> scanPage.xaml.cs using Plugin.BLE; using Plugin.BLE.Abstractions; using Plugin.BLE.Abstractions.Contracts; using Plugin.BLE.Abstractions.EventArgs; using Plugin.BLE.Abstractions.Extensions; using System; using System.Text; using System.Threading; namespace sampleApp; public partial class scanPage : ContentPage { private CancellationToken cancellationToken; public scanPage() { InitializeComponent(); } private async void scanBtn_Clicked(object sender, EventArgs e) { var adapter = CrossBluetoothLE.Current.Adapter; var systemDevices = adapter.GetSystemConnectedOrPairedDevices(); var filteredDevices = systemDevices.Where(device => device.Name != null).ToList(); ScanFilterOptions filterOptions = new ScanFilterOptions(); // Create a list to hold device names for display var deviceList = filteredDevices.Select(device => device.Name); var deviceNames = deviceList.ToList(); var device = systemDevices[0]; try { Guid service_id = filterOptions.ServiceUuids[0]; Guid serviceUUID = service_id; var charUUID = Guid.Parse("00002A00-0000-1000-8000-00805f9b34fb"); await adapter.ConnectToKnownDeviceAsync(serviceUUID); await SendDataToDevice(device, serviceUUID, charUUID); await DisplayAlert("Success", $"Connected to {device}!", "Ok"); } catch (Exception ex) { await DisplayAlert("Exception", $"{ex.Message}", "Ok"); } } private async Task SendDataToDevice(IDevice device, object serviceUuid, object characteristicUuid) { try { // Get the service and characteristic var service = await device.GetServiceAsync((Guid)serviceUuid); var characteristic = await service.GetCharacteristicAsync((Guid)characteristicUuid); // Your message to send string message = "Hello World from Xamarin.Forms!"; // Convert message to byte array (replace with your encoding if needed) byte[] messageBuffer = Encoding.ASCII.GetBytes(message); // Write data to the characteristic await characteristic.WriteAsync(messageBuffer); await DisplayAlert("Sent", "Message sent successfully!", "Ok"); } catch (Exception ex) { await DisplayAlert("Error", ex.Message, "Ok"); } } private async void ListDataItem(object sender, SelectedItemChangedEventArgs e) { if (e.SelectedItem == null) { return; // No item selected, ignore } var selectedDeviceName = e.SelectedItem.ToString(); // Handle device selection here (e.g., display alert or perform an action) await DisplayAlert("Selected Device", $"You selected: {selectedDeviceName}", "Ok"); } } 扫描页面.xaml <?xml version="1.0" encoding="utf-8" ?> <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="sampleApp.scanPage" Title="scanPage"> <VerticalStackLayout HorizontalOptions="Center" VerticalOptions="Center" Spacing="50"> <Label Text="Welcome to .NET MAUI!" VerticalOptions="Center" HorizontalOptions="Center" /> <Button x:Name="scanBtn" Text="Scan now" Clicked="scanBtn_Clicked"/> </VerticalStackLayout> </ContentPage> 我遇到以下异常 Java.Lang.SecurityException：“需要 android.permission.BLUETOOTH_CONNECT 权限 android.content.AttributionSource@c82fb2a4：GattService getDevicesMatchingConnectionStates” 我也添加了特定的依赖项，但我仍然收到此异常。帮助表示赞赏！ Java.Lang.SecurityException：'需要 android.permission.BLUETOOTH_CONNECT 权限 android.content.AttributionSource@c82fb2a4：GattService getDevicesMatchingConnectionStates' 自 Android 6.0 起，并非所有权限都仅仅因为放置在清单中而被授予。您必须使用 BLUETOOTH_CONNECT 处理运行时权限流程。从文档Xamarin＆MAUI的蓝牙LE插件中，我们可以发现： Android 12 及更高版本可能需要以下一项或多项额外的运行时权限取决于哪些功能您正在使用的库（请参阅 android 蓝牙权限文档） <uses-permission android:name="android.permission.BLUETOOTH_SCAN" /> <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /> <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" /> 如果您想声明您的应用程序仅适用于支持 BLE 的设备，请将此行添加到您的清单中： <uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>

.net bluetooth bluetooth-lowenergy maui mobile-application

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我正在开发一个 BLE 外围应用程序，该应用程序连接到中央设备并遇到数据丢失问题。在我的 Android 应用程序中，我使用了三个 ATT 特征。 //服务器发送数据给客户端...

android bluetooth-lowenergy bluetooth-peripheral

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蓝牙 LE - 多种特征行为

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android bluetooth bluetooth-lowenergy kotlin-coroutines kotlin-sharedflow

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