参考链接：

How to vibrate iOS and Android phones using FireMonkey and XE8 (embarcadero.com)

实测以下代码在 D10.4 社区版，OPPO 手机上运行成功。

前提：安卓系统，需要设置工程文件里面的用户权限：

需要 Vibrate 权限，在 Project - Options - UserPermissions 里面，找到 Vibrate ，勾选。

以下是全部测试代码：

unit Unit1;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs,
  FMX.Controls.Presentation, FMX.StdCtrls
  {$IFDEF ANDROID}
  ,Androidapi.JNI.Os,
  Androidapi.JNI.GraphicsContentViewText,
  Androidapi.Helpers,
  Androidapi.JNIBridge
{$ENDIF}
{$IFDEF IOS}
  ,IOSapi.MediaPlayer,  IOSapi.CoreGraphics,  FMX.Platform,  FMX.Platform.IOS,  IOSapi.UIKit,  Macapi.ObjCRuntime,  Macapi.ObjectiveC,  iOSapi.Cocoatypes,
  Macapi.CoreFoundation,  iOSapi.Foundation,  iOSapi.CoreImage,  iOSapi.QuartzCore,  iOSapi.CoreData
{$ENDIF}
  ;

{$IFDEF IOS}
Const
  libAudioToolbox        = '/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox';
  kSystemSoundID_vibrate = $FFF;

Procedure AudioServicesPlaySystemSound( inSystemSoundID: integer ); Cdecl; External libAudioToolbox Name _PU + 'AudioServicesPlaySystemSound';
{$ENDIF}

type
  TForm1 = class(TForm)
    SpeedButton1: TSpeedButton;
    procedure SpeedButton1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.fmx}

procedure TForm1.SpeedButton1Click(Sender: TObject);
{$IFDEF ANDROID}
Var
  Vibrator:JVibrator;
{$ENDIF}
begin
{$IFDEF ANDROID}
  Vibrator:=TJVibrator.Wrap((SharedActivityContext.getSystemService(TJContext.JavaClass.VIBRATOR_SERVICE) as ILocalObject).GetObjectID);
  // Vibrate for 500 milliseconds
  Vibrator.vibrate(500);
{$ENDIF}
{$IFDEF IOS}
  AudioServicesPlaySystemSound( kSystemSoundID_vibrate );
{$ENDIF}
end;

end.