Bluetooth LE does not detect devices

Question

I make an attempt to detect devices using Bluetooth LE, did as written in this library for Xamarin, but the devices found 0

Necessary manifestos in android included. Increased the time for scanning to 30 seconds, but nothing. Bluetooth enabled, version 4.0

Asus_Z00ED device (Android 6.0 - API 23). The project was created with a target on Android 8.1. Tried to switch target versions of Android (8.0,9.0) in the manifest, but there is also no detection

What else could be the reason for the lack of detection?

public class Page6 : ContentPage
    {
        IBluetoothLE ble;
        IAdapter adapter;
        ObservableCollection<IDevice> deviceList;
        Label label;

        public Page6()
        {
            ble = CrossBluetoothLE.Current;
            adapter = CrossBluetoothLE.Current.Adapter;
            deviceList = new ObservableCollection<IDevice>();

            label = new Label { Text = "Welcome to Xamarin.Forms!" };
            var buttonList = new Button() { Text = "Devices List" };
            buttonList.Clicked += ButtonList_Clicked;

            Content = new StackLayout
            {
                Children = {
                    label,
                    buttonList,
                }
            };
        }

        private async void ButtonList_Clicked(object sender, EventArgs e)
        {
            deviceList.Clear();
            adapter.ScanTimeout = 30000;
            adapter.DeviceDiscovered += (s, a) =>
            {
                deviceList.Add(a.Device);
            };

            await adapter.StartScanningForDevicesAsync(); // сканирование

            label.Text = deviceList.Count.ToString();
        }
    }

@Emil Yes, i I gave permission for "ACCESS_COARSE_LOCATION","ACCESS_FINE_LOCATION","BLUETOOTH","BLUETOOTH_ADMIN" — StriBog, Oct 13 '18 at 10:18
Have you explicitly requested them with https://developer.android.com/reference/android/support/v4/app/ActivityCompat#requestPermissions(android.app.Activity,%20java.lang.String[],%20int) or have you just declared them in the manifest? — Emil, Oct 13 '18 at 13:14

score 2 · Accepted Answer · answered Oct 28 '18 at 07:54

2

Remove the android:targetSdkVersion from the uses-sdk tag in your AndroidManifest.xml and everything works. Full tag from our project:

<uses-sdk android:minSdkVersion="15" />

answered Oct 28 '18 at 07:54

StriBog

165
1
1
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how's this possible? these are generated from gradle file – sed Sep 08 '20 at 23:18

Bluetooth LE does not detect devices

1 Answers1