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using Android.Content;
using Android.Hardware.Usb;
using Android.Util;
using Android.Views;
using AndroidX.RecyclerView.Widget;
[assembly: UsesFeature("android.hardware.usb.host")]
namespace UsbSerialForAndroidDemo
{
[Activity(Label = "@string/app_name", MainLauncher = true)]
[IntentFilter([UsbManager.ActionUsbDeviceAttached])]
[MetaData(UsbManager.ActionUsbDeviceAttached, Resource = "@xml/device_filter")]
public class MainActivity : Activity
{
static readonly string TAG = typeof(MainActivity).Name;
const string ACTION_USB_PERMISSION = "com.anotherlab.usbserialforandroid.demo.USB_PERMISSION";
UsbManager? usbManager;
RecyclerView? recyclerView;
TextView? statusText;
ProgressBar? progressBar;
UsbDeviceAdapter? adapter;
BroadcastReceiver? detachedReceiver;
readonly List<UsbSerialPort> usbPorts = [];
bool receiverInitalized = false;
protected override void OnCreate(Bundle? savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.activity_main);
var rootView = FindViewById<Android.Views.ViewGroup>(Android.Resource.Id.Content);
if (rootView != null)
{
var statusBarHeight = GetStatusBarHeight();
rootView.SetPadding(0, statusBarHeight, 0, 0);
}
usbManager = GetSystemService(Context.UsbService) as UsbManager;
recyclerView = FindViewById<RecyclerView>(Resource.Id.recyclerView);
statusText = FindViewById<TextView>(Resource.Id.statusText);
progressBar = FindViewById<ProgressBar>(Resource.Id.progressBar);
// Setup RecyclerView
recyclerView!.SetLayoutManager(new LinearLayoutManager(this));
adapter = new UsbDeviceAdapter(usbPorts, OnItemClick, this);
recyclerView.SetAdapter(adapter);
}
int GetStatusBarHeight()
{
int result = 0;
int resourceId = Resources?.GetIdentifier("status_bar_height", "dimen", "android") ?? 0;
if (resourceId > 0)
{
result = Resources?.GetDimensionPixelSize(resourceId) ?? 0;
}
return result;
}
protected override async void OnResume()
{
base.OnResume();
await PopulateDeviceListAsync();
// Register the broadcast receiver
detachedReceiver = new UsbDeviceDetachedReceiver(this);
RegisterReceiver(detachedReceiver, new IntentFilter(UsbManager.ActionUsbDeviceDetached));
receiverInitalized = true;
}
protected override void OnPause()
{
base.OnPause();
if (!receiverInitalized)
return;
// Unregister the broadcast receiver
var temp = detachedReceiver;
if (temp != null)
UnregisterReceiver(temp);
receiverInitalized = false;
}
internal static Task<IList<IUsbSerialDriver>> FindAllDriversAsync(UsbManager usbManager)
{
var table = UsbSerialProber.DefaultProbeTable;
// Add custom drivers here if needed
//table.AddProduct(0x1b4f, 0x0008, typeof(CdcAcmSerialDriver)); // IOIO OTG
//table.AddProduct(0x09D8, 0x0420, typeof(CdcAcmSerialDriver)); // Elatec TWN4
var prober = new UsbSerialProber(table);
return prober.FindAllDriversAsync(usbManager);
}
async Task OnItemClick(UsbSerialPort port)
{
Log.Info(TAG, $"Selected USB device: {port.Driver.Device.DeviceName}");
// Request user permission to connect to device
if (usbManager != null)
{
var permissionGranted = await usbManager.RequestPermissionAsync(port.Driver.Device, this);
if (permissionGranted)
{
// Start the UsbDeviceActivity for this device
var intent = new Intent(this, typeof(UsbDeviceActivity));
intent.PutExtra(UsbDeviceActivity.EXTRA_USB_DEVICE, new UsbSerialPortInfo(port));
StartActivity(intent);
}
else
{
Toast.MakeText(this, GetString(Resource.String.toast_permission_denied), ToastLength.Short)!.Show();
}
}
else
{
Toast.MakeText(this, GetString(Resource.String.toast_usb_manager_unavailable), ToastLength.Short)!.Show();
}
}
internal async Task PopulateDeviceListAsync()
{
ShowProgressBar();
Log.Info(TAG, "Refreshing device list...");
try
{
if (usbManager != null)
{
var drivers = await FindAllDriversAsync(usbManager);
usbPorts.Clear();
foreach (var driver in drivers)
{
var ports = driver.Ports;
Log.Info(TAG, $"+ {driver}: {ports.Count} port{(ports.Count == 1 ? "" : "s")}");
foreach (var port in ports)
{
usbPorts.Add(port);
}
}
RunOnUiThread(() =>
{
adapter!.NotifyDataSetChanged();
// Use plurals resource for device count
statusText!.Text = Resources!.GetQuantityString(Resource.Plurals.devices_found, usbPorts.Count, usbPorts.Count);
statusText!.Text += $"\n{GetString(Resource.String.tap_to_connect)}";
});
Log.Info(TAG, $"Done refreshing, {usbPorts.Count} entries found.");
}
}
catch (Exception ex)
{
Log.Error(TAG, $"Error populating device list: {ex.Message}");
RunOnUiThread(() =>
{
statusText!.Text = GetString(Resource.String.status_error_loading_devices);
});
}
finally
{
HideProgressBar();
}
}
void ShowProgressBar()
{
RunOnUiThread(() =>
{
progressBar!.Visibility = ViewStates.Visible;
statusText!.Text = GetString(Resource.String.status_refreshing);
});
}
void HideProgressBar()
{
RunOnUiThread(() =>
{
progressBar!.Visibility = ViewStates.Gone;
});
}
}
}