FireMonkey Android NFC Adapter
Introduction
FireMonkey, the cross-platform UI framework from Embarcadero, enables developers to build native Android apps with rich visual experiences. Near Field Communication (NFC) is a technology that allows devices to communicate wirelessly over short distances. This article explores how to leverage FireMonkey’s Android NFC adapter to integrate NFC functionality into your applications.
Prerequisites
* Embarcadero RAD Studio with FireMonkey support.
* An Android device with NFC capabilities.
Setting up the NFC Adapter
1. Enable NFC on your Android device
Go to your device settings and enable NFC.
2. Add the NFC Adapter to your FireMonkey project
* Open your FireMonkey project in RAD Studio.
* In the “Tool Palette,” locate the “Mobile” category.
* Drag and drop the “TAndroidNFCAdapter” component onto your form.
Using the NFC Adapter
1. Handle NFC Tag Discovery
The `TAndroidNFCAdapter` component provides events for handling NFC tag discovery. The `OnTagDiscovered` event is fired when an NFC tag is detected within range.
“`Delphi
procedure TForm1.AndroidNFCAdapter1TagDiscovered(Sender: TObject;
Tag: TAndroidNFCAdapterTag);
begin
// Process the discovered tag
ShowMessage(‘Tag ID: ‘ + Tag.TagID);
end;
“`
2. Read Data from NFC Tags
You can use the `ReadTag` method of the `TAndroidNFCAdapter` component to read data from NFC tags.
“`Delphi
procedure TForm1.Button1Click(Sender: TObject);
var
TagData: String;
begin
TagData := AndroidNFCAdapter1.ReadTag;
// Process the read data
ShowMessage(‘Tag Data: ‘ + TagData);
end;
“`
3. Write Data to NFC Tags
The `WriteTag` method allows you to write data to NFC tags.
“`Delphi
procedure TForm1.Button2Click(Sender: TObject);
begin
AndroidNFCAdapter1.WriteTag(‘Hello, NFC!’);
// Data written to the tag
ShowMessage(‘Data written to the tag’);
end;
“`
Example: Reading a NFC Tag
This example demonstrates reading data from a NFC tag using the `TAndroidNFCAdapter` component.
“`Delphi
unit Unit1;
interface
uses
System.SysUtils, System.Types, System.UITypes, System.Classes,
FMX.Types, FMX.Controls, FMX.Forms, FMX.StdCtrls, FMX.Mobile.Android.NFC;
type
TForm1 = class(TForm)
AndroidNFCAdapter1: TAndroidNFCAdapter;
Button1: TButton;
procedure AndroidNFCAdapter1TagDiscovered(Sender: TObject;
Tag: TAndroidNFCAdapterTag);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.fmx}
procedure TForm1.AndroidNFCAdapter1TagDiscovered(Sender: TObject;
Tag: TAndroidNFCAdapterTag);
begin
ShowMessage(‘Tag ID: ‘ + Tag.TagID);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
TagData: String;
begin
TagData := AndroidNFCAdapter1.ReadTag;
ShowMessage(‘Tag Data: ‘ + TagData);
end;
end.
“`
Output
When you run this application and bring an NFC tag close to your Android device, the `TagDiscovered` event will be triggered. If you click the button, it will read data from the tag and display it in a message box.
Conclusion
The FireMonkey Android NFC adapter provides a straightforward way to integrate NFC functionality into your Android applications. By following the steps outlined in this article, you can leverage NFC to enable features like tag reading, data writing, and device-to-device communication.