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如何处理App的Application的事件

http://blog.sina.com.cn/s/blog_44fa172f0102vwr2.html

直接上代码，还有条经验就是SetApplicationEventHandler可注册多个事件方法。

unit Unit6;

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.ScrollBox, FMX.Memo, FMX.Platform;

type
  TForm6 = class(TForm)
    Memo1: TMemo;
    procedure FormCreate(Sender: TObject);
  private
    function HandleAppEvent(AAppEvent: TApplicationEvent;
      AContext: TObject): Boolean;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form6: TForm6;

implementation

{$R *.fmx}

procedure TForm6.FormCreate(Sender: TObject);
var
  SvcEvents: IFMXApplicationEventService;
begin
  if TPlatformServices.Current.SupportsPlatformService
    (IFMXApplicationEventService, IInterface(SvcEvents))
  then
    SvcEvents.SetApplicationEventHandler(HandleAppEvent);

end;

function TForm6.HandleAppEvent(AAppEvent: TApplicationEvent; AContext: TObject): Boolean;
var
  astate: string;
begin
  case AAppEvent of
    TApplicationEvent.FinishedLaunching:
      astate := 'FinishedLaunching';
    TApplicationEvent.BecameActive:
      astate := 'BecameActive';
    TApplicationEvent.WillBecomeInactive:
      astate := 'WillBecomeInactive';
    TApplicationEvent.EnteredBackground:
      astate := 'EnteredBackground';
    TApplicationEvent.WillBecomeForeground:
      astate := 'WillBecomeForeground';
    TApplicationEvent.WillTerminate:
      astate := 'WillTerminate';
    TApplicationEvent.LowMemory:
      astate := 'LowMemory';
    TApplicationEvent.TimeChange:
      astate := 'TimeChange';
    TApplicationEvent.OpenURL:
      astate := 'OpenURL';
  end;
  Self.Memo1.Lines.Add(astate);
  Result := true;
end;

end.

还可以参考下面的例子，是消息的类型

FMX.Platform.TApplicationEvent

http://docwiki.embarcadero.com/Libraries/Seattle/en/FMX.Platform.TApplicationEvent

http://docwiki.embarcadero.com/Libraries/Tokyo/en/FMX.Platform.TApplicationEvent

TApplicationEvent = (FinishedLaunching, BecameActive, WillBecomeInactive, EnteredBackground, WillBecomeForeground, WillTerminate, LowMemory, TimeChange, OpenURL);

An instance of TApplicationEvent may have any of the following values:

Item	Description	Platform
Item	Description	Android	iOS
`BecameActive`	Your application has gained the focus.//applicationDidBecomeActive	Supported	Supported
`EnteredBackground`	The user is no longer using your application, but your application is still running in the background.	Supported	Supported
`FinishedLaunching`	Your application has been launched.	Supported	Supported
`LowMemory`	This warns your application that the device is running out of memory. Your application should reduce memory usage, freeing structures and data that can be loaded again at a later point.	Supported	Supported
`OpenURL`	You application has received a request to open an URL. Application events of this type are usually associated with a context. This context is an instance of the iOS-only `TiOSOpenApplicationContext` class, which provides the following read-only properties: `TiOSOpenApplicationContext.SourceApp` is a string that contains the bundle ID of the application that requested your application to open the URL. `TiOSOpenApplicationContext.URL` is the URL to open, either a network resource or a file. `TiOSOpenApplicationContext.Context` is a pointer to a property-list object that might provide additional information. See the iOS API reference documentation for more information.		Supported
`TimeChange`	There has been a significant change in time. This event might happen for example when the day changes or when the device changes to or from daylight savings time.		Supported
`WillBecomeForeground`	The user is now using your application, which was previously in the background.	Supported	Supported
`WillBecomeInactive`	Your application is going to loose the focus. / applicationWillResignActive	Supported	Supported
`WillTerminate`	The user is quitting your application.	Supported	Supported


http://codeverge.com/embarcadero.delphi.ios/ifmxapplicationeventservice-not-firing/2028062

http://codeverge.com/embarcadero.delphi.firemonkey/keep-application-on-top/2009583

procedure TMainForm.FormCreate(Sender: TObject); var SvcEvents: IFMXApplicationEventService; begin if TPlatformServices.Current.SupportsPlatformService(IFMXApplicationEventService, IInterface(SvcEvents)) then SvcEvents.SetApplicationEventHandler(HandleAppEvent); Application.OnException := ExceptionHandler; end; function TMainForm.HandleAppEvent(AAppEvent: TApplicationEvent; AContext: TObject): Boolean; begin case AAppEvent of TApplicationEvent.FinishedLaunching: ; TApplicationEvent.BecameActive: ; TApplicationEvent.WillBecomeInactive: ; TApplicationEvent.EnteredBackground: ; TApplicationEvent.WillBecomeForeground: ; TApplicationEvent.WillTerminate: ; TApplicationEvent.LowMemory: ; TApplicationEvent.TimeChange: ; TApplicationEvent.OpenURL: ; end; Result := True; end; - See more at: http://codeverge.com/embarcadero.delphi.firemonkey/keep-application-on-top/2009583#sthash.6XM5jEUI.dpuf

http://community.embarcadero.com/index.php/blogs/entry/mobile-app-lifecycle-events-handling-in-delphi-xe5-40067

http://codeverge.com/embarcadero.delphi.firemonkey/keep-application-on-top/2009583

FMX.Platform.pas

procedure TMainForm.FormCreate( Sender : TObject );
  var
    SvcEvents : IFMXApplicationEventService;
begin
    if TPlatformServices.Current.SupportsPlatformService
      ( IFMXApplicationEventService, IInterface( SvcEvents ) )
    then
      SvcEvents.SetApplicationEventHandler( HandleAppEvent );
    Application.OnException := ExceptionHandler;
end;

function TMainForm.HandleAppEvent(   AAppEvent : TApplicationEvent;   AContext  : TObject ) : Boolean;
begin
    case AAppEvent of
      TApplicationEvent.FinishedLaunching :
        ;
      TApplicationEvent.BecameActive :
        ;//第一次运行app触发,从后台切换过来也触发
      TApplicationEvent.WillBecomeInactive :
        ;
      TApplicationEvent.EnteredBackground :
        ;//切换到后台
      TApplicationEvent.WillBecomeForeground :
        ;//从后台切换到前台
      TApplicationEvent.WillTerminate :
        ;
      TApplicationEvent.LowMemory :
        ;
      TApplicationEvent.TimeChange :
        ;
      TApplicationEvent.OpenURL :
        ;
    end;
    Result := True;
end;
//See more at : http://codeverge.com/embarcadero.delphi.firemonkey/keep-application-on-top/2009583

和IOS的对比

/app启动完毕调用，应用初次启动
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 

//进入后台时调用：一般在这里保存应用数据（数据，比如暂停游戏）
- (void)applicationDidEnterBackground:(UIApplication *)application 

连续点击两次Home按钮
在任务栏点击SpringBoard或者按下Home按钮，单次点击Home按钮

- (void)applicationWillResignActive:(UIApplication *)application



//程序回到时调用，恢复数据
- (void)applicationWillEnterForeground:(UIApplication *)application
//接收内存警告时候调用
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
//程序即将退出
- (void)applicationWillTerminate:(UIApplication *)application 

//程序获取焦点，在任务栏中回到app
- (void)applicationDidBecomeActive:(UIApplication *)application

跟踪的时间触发日志。

FormCreate
FormShow
BecameActive

FormSaveState
EnteredBackgrounbd
WillBecomeForeground

BecameActive

FormSaveState
EnteredBackgrounbd

WillBecomeForeground
BecameActive

FormSaveState
EnteredBackgrounbd

WillBecomeForeground
BecameActive

function TFMXMusicPlayerFrm.HandleAppEvent(AAppEvent: TApplicationEvent; AContext: TObject): Boolean;
var
  astate: string;
begin
  case AAppEvent of
    TApplicationEvent.FinishedLaunching:
      astate := 'FinishedLaunching';
    TApplicationEvent.BecameActive:
      astate := 'BecameActive';
    TApplicationEvent.WillBecomeInactive:
      astate := 'WillBecomeInactive';
    TApplicationEvent.EnteredBackground:
      astate := 'EnteredBackground';
    TApplicationEvent.WillBecomeForeground:
      astate := 'WillBecomeForeground';
    TApplicationEvent.WillTerminate:
      astate := 'WillTerminate';
    TApplicationEvent.LowMemory:
      astate := 'LowMemory';
    TApplicationEvent.TimeChange:
      astate := 'TimeChange';
    TApplicationEvent.OpenURL:
      astate := 'OpenURL';
  end;

  Result := true;
end;

FMX.Platform.iOS.pas

Application delegates

  TApplicationDelegate = class{(TOCLocal, UIApplicationDelegate)}
  private
    FMainWindow: TFMXWindow;
  public
    function application(Sender: UIApplication; didFinishLaunchingWithOptions: NSDictionary): Boolean; overload; cdecl;
    procedure application(Sender: UIApplication; didReceiveLocalNotification: UILocalNotification); overload; cdecl;
    procedure application(Sender: UIApplication; didRegisterForRemoteNotificationsWithDeviceToken: NSData); overload; cdecl;
    function application(const openURL, sourceApplication: string; annotation: Pointer): Boolean; overload; cdecl;
    procedure applicationDidBecomeActive(const Sender: UIApplication); cdecl;
    procedure applicationDidEnterBackground(const Sender: UIApplication); cdecl;
    procedure applicationDidRegisterForRemoteNotificationsWithDeviceToken(Sender: UIApplication; AToken: NSData); cdecl;
    procedure applicationDidReceiveRemoteNotification(Sender: UIApplication; ANotification: NSDictionary); cdecl;
    procedure didFailToRegisterForRemoteNotificationsWithError(Sender: UIApplication; AError: NSError); cdecl;
    procedure applicationDidReceiveMemoryWarning(Sender: UIApplication); cdecl;
    procedure applicationSignificantTimeChange(Sender: UIApplication); cdecl;
    procedure applicationWillEnterForeground(Sender: UIApplication); cdecl;
    procedure applicationWillResignActive(Sender: UIApplication); cdecl;
    procedure applicationWillTerminate(Sender: UIApplication); cdecl;
    procedure setWindow(window: UIWindow); cdecl;
    function window: UIWindow; cdecl;
    property MainWindow: TFMXWindow read FMainWindow;
  end;

// Application delegates

function applicationDidFinishLaunchingWithOptions(self: id; _cmd: SEL;
  application: PUIApplication; options: PNSDictionary): Boolean; cdecl;
begin
  Result := PlatformCocoa.FAppDelegate.application(TUIApplication.Wrap(application), TNSDictionary.Wrap(options));
end;

procedure applicationDidReceiveLocalNotification(self: id; _cmd: SEL; application: PUIApplication;
  notification: Pointer); cdecl;
begin
  PlatformCocoa.FAppDelegate.application(TUIApplication.Wrap(application), TUILocalNotification.Wrap(notification));
end;

procedure didReceiveRemoteNotification(self: id; _cmd: SEL; app: PUIApplication; ANotification: PNSDictionary); cdecl;
begin
  PlatformCocoa.FAppDelegate.applicationDidReceiveRemoteNotification(TUIApplication.Wrap(app), TNSDictionary.Wrap(ANotification));
end;

procedure didFailToRegisterForRemoteNotificationsWithError(self: id; _cmd: SEL; app: PUIApplication; error: PNSError); cdecl;
begin
  PlatformCocoa.FAppDelegate.didFailToRegisterForRemoteNotificationsWithError(TUIApplication.Wrap(application), TNSError.Wrap(error));
end;

procedure didRegisterForRemoteNotificationsWithDeviceToken(self: id; _cmd: SEL; application: PUIApplication; deviceToken: PNSData); cdecl;
begin
  PlatformCocoa.FAppDelegate.applicationDidRegisterForRemoteNotificationsWithDeviceToken(TUIApplication.Wrap(application), TNSData.Wrap(deviceToken));
end;

procedure applicationOpenURLWithSourceAnnotation(self: id; _cmd: SEL; application: PUIApplication; url: Pointer; sourceApplication: PNSString; annotation: id);
var
  URLString: string;
  SourceAppString: string;
begin
  if url <> nil then
    URLString := NSStrToStr(TNSURL.Wrap(url).absoluteString)
  else
    URLString := '';
  if sourceApplication <> nil then
    SourceAppString := NSStrToStr(TNSString.Wrap(sourceApplication))
  else
    SourceAppString := '';
  PlatformCocoa.FAppDelegate.application(URLString, SourceAppString, annotation);
end;

procedure applicationDidBecomeActive(self: id; _cmd: SEL; application: PUIApplication); cdecl;
begin
  PlatformCocoa.FAppDelegate.applicationDidBecomeActive(TUIApplication.Wrap(application));
end;

procedure applicationDidEnterBackground(self: id; _cmd: SEL; application: PUIApplication); cdecl;
begin
  PlatformCocoa.FAppDelegate.applicationDidEnterBackground(TUIApplication.Wrap(application));
end;

procedure applicationWillEnterForeground(self: id; _cmd: SEL; application: PUIApplication); cdecl;
begin
  PlatformCocoa.FAppDelegate.applicationWillEnterForeground(TUIApplication.Wrap(application));
end;

procedure applicationWillTerminate(self: id; _cmd: SEL; application: PUIApplication); cdecl;
begin
  PlatformCocoa.FAppDelegate.applicationWillTerminate(TUIApplication.Wrap(application));
end;

procedure applicationDidReceiveMemoryWarning(self: id; _cmd: SEL; application: PUIApplication); cdecl;
begin
  PlatformCocoa.FAppDelegate.applicationDidReceiveMemoryWarning(TUIApplication.Wrap(application));
end;

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原文地址：https://www.cnblogs.com/westsoft/p/8413802.html