Android实例-退出程序

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.