本文整理自网络，侵删。
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;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
Label1: TLabel;
Button4: TButton;
Button5: TButton;
Button6: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure FormKeyUp(Sender: TObject; var Key: Word; var KeyChar: Char;
Shift: TShiftState);
procedure Button4Click(Sender: TObject);
procedure Button6Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
uses
FMX.Platform.Android,
FMX.Helpers.Android,
Androidapi.JNI.Net,
Androidapi.JNI.GraphicsContentViewText,
Androidapi.JNI.JavaTypes,
Androidapi.Helpers,
system.IOUtils;
{$R *.fmx}
{$R *.NmXhdpiPh.fmx ANDROID}
{$R *.LgXhdpiPh.fmx ANDROID}
{$R *.Macintosh.fmx MACOS}
{$R *.XLgXhdpiTb.fmx ANDROID}
{$R *.LgXhdpiTb.fmx ANDROID}
{$R *.GGlass.fmx ANDROID}
procedure TForm1.Button1Click(Sender: TObject);
begin
Label1.Text := '按返回键将会出现一个对话框！';
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
MainActivity.finish; { 退出程序 }
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
{$IFDEF ANDROID}
Application.MainForm.DisposeOf; { 退出程序 }
halt(0);
{$ENDIF}
end;
procedure TForm1.Button4Click(Sender: TObject);
var
Intent: JIntent;
begin
Intent := TJIntent.JavaClass.init(TJIntent.JavaClass.ACTION_MAIN);
Intent.addCategory(TJIntent.JavaClass.CATEGORY_HOME);
Intent.setFlags(TJIntent.JavaClass.FLAG_ACTIVITY_NEW_TASK);
SharedActivityContext.startActivity(Intent);
end;
procedure TForm1.Button5Click(Sender: TObject);
begin
Application.Terminate;
end;
procedure TForm1.Button6Click(Sender: TObject);
begin
Close;
end;
//此代码报错，不可用，原因不明。
procedure TForm1.FormKeyUp(Sender: TObject; var Key: Word; var KeyChar: Char;
Shift: TShiftState);
begin
if Key = vkHardwareBack then//如果按下物理返回键
begin
Label1.Text := '1';
if MessageDlg('确认退出吗？', TMsgDlgType.mtConfirmation,
[TMsgDlgBtn.mbOK, TMsgDlgBtn.mbCancel], -1) = mrOK then
MainActivity.finish; { 退出程序 }
Key := 0;//必须的，不然按否也会退出
Exit;
end;
end;
end.
来源：https://www.cnblogs.com/FKdelphi/p/4685907.html
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