我使用以下旧代码 (Xamarin.Android) 作为用 Xamarin.Forms 编写的资产管理应用程序的免费应用程序。我正在尝试更新 Xamarin.Forms 应用程序并将 Xamarin.Android 代码集成到新的 .NET Maui 版本中，但很难找到如何集成平台特定代码的示例。
任何帮助表示赞赏。 谢谢 保罗。
namespace NfcGuidWriter
{
using Android.App;
using Android.Content;
using Android.Nfc;
using Android.Nfc.Tech;
using Android.OS;
using Android.Views;
using Android.Widget;
using System;
using System.Linq;
[Activity(Label = "@string/app_name", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{
//--------------------------------------------------------------------------------------------------------------------------------------------
public static readonly string Tag = "NFC Guid Writer";
private bool inWriteMode;
private NfcAdapter nfcAdapter;
private TextView textInfo; //will need refactoring
private Button writeTagButton;
//--------------------------------------------------------------------------------------------------------------------------------------------
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.MainActivity);
// Get a reference to the default NFC adapter for this device. This adapter
// is how an Android application will interact with the actual hardware.
nfcAdapter = NfcAdapter.GetDefaultAdapter(this);
writeTagButton = FindViewById<Button>(Resource.Id.button_write_tag);
writeTagButton.Click += OnClickWriteTagButton;
textInfo = FindViewById<TextView>(Resource.Id.tv_info);
}
//--------------------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// This method is called when an NFC tag is discovered by the application.
/// </summary>
/// <param name="intent"></param>
protected override void OnNewIntent(Intent intent)
{
try
{
if (inWriteMode)
{
inWriteMode = false;
Tag tag = intent.GetParcelableExtra(NfcAdapter.ExtraTag) as Tag;
byte[] id = tag.GetId();
NfcV nfcvTag = NfcV.Get(tag);
int[] intArray = new int[36];
// 4d196b8c-aa42-4f90-924f-b953654c31f7 (Length = 36)
string guidStr = Guid.NewGuid().ToString();
char[] guidChars = guidStr.ToCharArray();
for (int i = 0; i < guidChars.Count(); i++)
{
int value = Convert.ToInt32(guidChars[i]);
intArray[i] = value;
}
if (nfcvTag != null)
{
nfcvTag.Connect();
// 0x20 with id (UID) works! (addressed v non addressed using 0,0,0,0,0,0,0,0)
//---------------------------------------------------------------------------------------
// E1 40 0E 00
byte[] cmd0 = new byte[] {
/* FLAGS */ (byte)0x20, // 0x00 0x20 0x22 0x40 0x42 ????
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x00,
/* DATA */ (byte)0xE1, (byte)0x40, (byte)0x0E, (byte)0x00
};
Array.Copy(id, 0, cmd0, 2, 8);
//---------------------------------------------------------------------------------------
// 03 2B D1 01
byte[] cmd1 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x01,
/* DATA */ (byte)0x03, (byte)0x2B, (byte)0xD1, (byte)0x01
};
Array.Copy(id, 0, cmd1, 2, 8);
//---------------------------------------------------------------------------------------
// 27 54 02 65
byte[] cmd2 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x02,
/* DATA */ (byte)0x27, (byte)0x54, (byte)0x02, (byte)0x65
};
Array.Copy(id, 0, cmd2, 2, 8);
//---------------------------------------------------------------------------------------
// 6E XX XX XX
byte[] cmd3 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x03,
/* DATA */ (byte)0x6E, (byte)intArray[0], (byte)intArray[1], (byte)intArray[2]
};
Array.Copy(id, 0, cmd3, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd4 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x04,
/* DATA */ (byte)intArray[3], (byte)intArray[4], (byte)intArray[5], (byte)intArray[6]
};
Array.Copy(id, 0, cmd4, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd5 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x05,
/* DATA */ (byte)intArray[7], (byte)intArray[8], (byte)intArray[9], (byte)intArray[10]
};
Array.Copy(id, 0, cmd5, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd6 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x06,
/* DATA */ (byte)intArray[11], (byte)intArray[12], (byte)intArray[13], (byte)intArray[14]
};
Array.Copy(id, 0, cmd6, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd7 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x07,
/* DATA */ (byte)intArray[15], (byte)intArray[16], (byte)intArray[17], (byte)intArray[18]
};
Array.Copy(id, 0, cmd7, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd8 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x08,
/* DATA */ (byte)intArray[19], (byte)intArray[20], (byte)intArray[21], (byte)intArray[22]
};
Array.Copy(id, 0, cmd8, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd9 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x09,
/* DATA */ (byte)intArray[23], (byte)intArray[24], (byte)intArray[25], (byte)intArray[26]
};
Array.Copy(id, 0, cmd9, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd10 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x0A,
/* DATA */ (byte)intArray[27], (byte)intArray[28], (byte)intArray[29], (byte)intArray[30]
};
Array.Copy(id, 0, cmd10, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd11 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x0B,
/* DATA */ (byte)intArray[31], (byte)intArray[32], (byte)intArray[33], (byte)intArray[34]
};
Array.Copy(id, 0, cmd11, 2, 8);
//---------------------------------------------------------------------------------------
// XX XX XX XX
byte[] cmd12 = new byte[] {
/* FLAGS */ (byte)0x20,
/* COMMAND */ (byte)0x21,
/* UID */ (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
/* OFFSET */ (byte)0x0C,
/* DATA */ (byte)intArray[35], (byte)0x00, (byte)0x00, (byte)0x00
};
Array.Copy(id, 0, cmd12, 2, 8);
//---------------------------------------------------------------------------------------
byte[] response0 = nfcvTag.Transceive(cmd0);
byte[] response1 = nfcvTag.Transceive(cmd1);
byte[] response2 = nfcvTag.Transceive(cmd2);
byte[] response3 = nfcvTag.Transceive(cmd3);
byte[] response4 = nfcvTag.Transceive(cmd4);
byte[] response5 = nfcvTag.Transceive(cmd5);
byte[] response6 = nfcvTag.Transceive(cmd6);
byte[] response7 = nfcvTag.Transceive(cmd7);
byte[] response8 = nfcvTag.Transceive(cmd8);
byte[] response9 = nfcvTag.Transceive(cmd9);
byte[] response10 = nfcvTag.Transceive(cmd10);
byte[] response11 = nfcvTag.Transceive(cmd11);
byte[] response12 = nfcvTag.Transceive(cmd12);
//---------------------------------------------------------------------------------------
nfcvTag.Close();
}
DisplayMessage("Guid (" + guidStr + ") written to tag.");
}
}
catch (Exception ex)
{
DisplayMessage("Exception - " + ex.Message);
}
}
//--------------------------------------------------------------------------------------------------------------------------------------------
protected override void OnPause()
{
base.OnPause();
// App is paused, so no need to keep an eye out for NFC tags.
if (nfcAdapter != null)
nfcAdapter.DisableForegroundDispatch(this);
}
//--------------------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Displays the message into a text view and into a new toast.
/// </summary>
/// <param name="ndefMessage">Message.</param>
private void DisplayMessage(string ndefMessage)
{
textInfo.Text = ndefMessage;
Toast.MakeText(this, ndefMessage, ToastLength.Long).Show();
}
//--------------------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Identify to Android that this activity wants to be notified when
/// an NFC tag is discovered.
/// </summary>
private void EnableWriteMode()
{
inWriteMode = true;
// Create an intent filter for when an NFC tag is discovered.
var tagDetected = new IntentFilter(NfcAdapter.ActionTagDiscovered);
var filters = new[] { tagDetected };
// When an NFC tag is detected, Android will use the PendingIntent to come back to this activity.
// The OnNewIntent method will invoked by Android.
var intent = new Intent(this, GetType()).AddFlags(ActivityFlags.SingleTop);
var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.Mutable);
if (nfcAdapter == null)
{
var alert = new AlertDialog.Builder(this).Create();
alert.SetMessage("NFC is not supported on this device");
alert.SetTitle("NFC Unavailable");
alert.SetButton("OK", delegate
{
writeTagButton.Enabled = false;
textInfo.Text = "NFC is not supported on this device";
});
alert.Show();
}
else
nfcAdapter.EnableForegroundDispatch(this, pendingIntent, filters, null);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private void OnClickWriteTagButton(object sender, EventArgs eventArgs)
{
var view = (View)sender;
if (view.Id == Resource.Id.button_write_tag)
{
DisplayMessage("Click the button then hold the ISO 15693 tag against the device to write.");
EnableWriteMode();
}
}
//-------------------------------------------------------------------------------------------------------------------------------------------
}
}
我正在尝试更新 Xamarin.Forms 应用程序并将 Xamarin.Android 代码集成到新的 .NET Maui 版本中，但很难找到如何集成平台特定代码的示例。
嗯，关于在 MAUI Android 上使用 NFC，您可以参考问答中的案例：NFC 插件或库用于 .NET Maui Android？ 以及本教程：NFC NDEF 与 MAUI 和 Xamarin.Forms 通信。
希望这些可以帮助到你。