[Android]How to make an event listener?

[Fabian1648 2]

Hello,

 

Is there a solution with FMX to have an events listener that detects all the events that are triggered in an app?

 

Thanks for all

 

Edited May 29, 2021 by Fabian1648

[Rollo62 533]

You could look into TMessage and TMessageManager,  which is used internally a lot, but probably not all events.

Anyway, you could build something around this, also for custom events,  it works quite reliable . 

[Dave Nottage 553]

On 5/29/2021 at 8:07 PM, Fabian1648 said:

Is there a solution with FMX to have an events listener that detects all the events that are triggered in an app?

By "events", if you mean things like whether the app became active, entered the background etc, you can have the app subscribe to TApplicationEventMessage:

 

http://docwiki.embarcadero.com/Libraries/Sydney/en/FMX.Platform.TApplicationEventMessage

 

Use TMessageManager to subscribe to the event, e.g:

  TMessageManager.DefaultManager.SubscribeToMessage(TApplicationEventMessage, ApplicationEventMessageHandler);

..and to unsubscribe when you no longer wish to receive the messages:

  TMessageManager.DefaultManager.Unsubscribe(TApplicationEventMessage, ApplicationEventMessageHandler);

Example handler:

procedure TMyClass.ApplicationEventMessageHandler(const Sender: TObject; const M: TMessage);
var
  LMessage: TApplicationEventMessage;
begin
  LMessage := TApplicationEventMessage(M);
  case LMessage.Value.Event of
    TApplicationEvent.BecameActive:
      DoAppBecameActive;
    TApplicationEvent.EnteredBackground:
      DoAppEnteredBackground;
    // etc
  end;
end;

 

[Fabian1648 2]

Thanks for your answers