[英]Android DialogFragment lifecycle when it is actually fully visible to user
[英]When is a Delphi form actually visible to the user on Android?
我正在开发的游戏在首次加载时会进行一些预处理,因此我想向用户显示一个“加载%”,以表明该游戏未冻结。
我试图通过等待主表单显示给用户,然后在执行预处理时显示更新进度栏来做到这一点。
为了使预处理正常工作,我需要两条信息:
1.表格以其最终尺寸显示(在整个显示屏上最大化)。
2.表单对用户可见。
这是一条日志,显示了在我的游戏加载时触发表单事件的顺序。 请记住,在以下任何事件中,我实际上都没有使用代码来更改表单的大小:
FormCreate
FormResize, clientSize : 0x0
FormResize, clientSize : 0x0
FormResize, clientSize : 0x0
FormResize, clientSize : 0x0
FormShow
FormActivate
FormResize, clientSize : 360x640
当前,我尝试在最后一次调整大小时显示加载屏幕(指示表单实际上是显示的大小),但是此时,主表单仍然不可见(即使在FormShow和FormActivate之后),我最后显示Android的默认“灰色渐变”屏幕,直到我的预处理代码完成后才显示进度条。
我尝试在更新进度条后调用“ application.processmessages”,但这并没有什么不同...
如何检测我的主表单实际上对Android用户可见?
[更新]
我创建了一个小应用程序来演示此问题:
https://github.com/bLightZP/Test_Splash
这个例子说明了使用的OnIdle,还应该如何执行。
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)
ProgressBar1: TProgressBar;
private
FShown: Boolean;
procedure ApplicationOnIdleHandler(Sender: TObject; var Done: Boolean);
procedure ExecutePreProcessing;
procedure ExecutePreProcessingSynchronized;
public
constructor Create(AOwner: TComponent); override;
end;
var
Form1: TForm1;
implementation
{$R *.fmx}
constructor TForm1.Create(AOwner: TComponent);
begin
inherited;
// Method 1: Use OnIdle to execute code when the main form is visible:
Application.OnIdle := ApplicationOnIdleHandler;
// Method 2: Use a thread to execute the preprocessing. Comment out the line above if using this method, and uncomment the line below
// TThread.CreateAnonymousThread(ExecutePreProcessingSynchronized).Start;
end;
procedure TForm1.ApplicationOnIdleHandler(Sender: TObject; var Done: Boolean);
begin
if not FShown then
begin
FShown := True;
ExecutePreProcessing;
end;
end;
procedure TForm1.ExecutePreProcessing;
var
I: Integer;
begin
for I := 1 to 100 do
begin
Sleep(50);
ProgressBar1.Value := I;
Application.ProcessMessages; // <---- Not the best idea
end;
end;
procedure TForm1.ExecutePreProcessingSynchronized;
var
I: Integer;
begin
for I := 1 to 100 do
begin
Sleep(50);
// Ensure UI updates happen in the main thread
TThread.Synchronize(nil,
procedure
begin
ProgressBar1.Value := I;
end
);
end;
end;
end.
BecameActive事件(ApplicationEvent)怎么样? 使用本文并将其翻译为Google翻译http://delphifmandroid.blogspot.com/2016/09/delphi-android.html
启动应用程序:
09-20 20:13:43.151: I/info(15893): FMX: Project1: FormCreate
09-20 20:13:43.151: I/info(15893): FMX: Project1: FormResize
09-20 20:13:43.151: I/info(15893): FMX: Project1: FormResize
09-20 20:13:43.161: I/info(15893): FMX: Project1: FormResize
09-20 20:13:43.161: I/info(15893): FMX: Project1: FormShow
09-20 20:13:43.161: I/info(15893): FMX: Project1: FormActivate
09-20 20:13:43.161: I/info(15893): FMX: Project1: Finished Launching
09-20 20:13:43.221: I/info(15893): FMX: Project1: FormPaint
09-20 20:13:43.231: I/info(15893): FMX: Project1: Became Active
09-20 20:13:43.261: I/info(15893): FMX: Project1: FormPaint
09-20 20:13:43.281: I/info(15893): FMX: Project1: FormPaint
09-20 20:13:43.311: I/info(15893): FMX: Project1: FormPaint
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