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Vitor MeriatSoftware Development [email protected]
O ciclo de vida da aplicação Universal Windows Platform Criando APPs inteligentes e responsivas
UM WINDOWS
PhoneDesktops
& All-in-OnesClassic Laptop
XboxTablet
Application lifecycle
Installation1
Activation2 NotRunning
Activation2
Event
Handlers
UI
Running
Suspending3
Suspended
Event
Handlers
UI
Application LifetimeApps can be in 1 of 3 states
Not RunningRunningSuspended
Application receive events when transitioning between states
Except: Suspended->NotRunning
Running
SuspendedNotRunning
Activated Suspending
Resuming
App Lifecycle
Runningapp
Suspendedapp
Suspending Terminatedapp
Low memory
Resuming
Background task executes
http://windows.Microsoft.com
Application Lifetime
Running Suspended Running Suspended Not Running
Launched Suspended(5 seconds)
Activated Suspended(5 seconds)
Mem
ory
Terminated(no event)
OnNavigatedFrompublic override Task OnNavigatedFromAsync(IDictionary<string, object> state, bool suspending){ if (suspending) { state["FirstName"] = this.FirstName; state["LastName"] = this.LastName; state["Email"] = this.Email; } return Task.FromResult<object>(null);}
OnNavigatedTopublic override void OnNavigatedTo(string parameter, NavigationMode mode, IDictionary<string, object> state){ try { this.FirstName = state["FirstName"].ToString(); this.LastName = state["LastName"].ToString(); this.Email = state["Email"].ToString(); } finally { state.Clear(); }}
Extended execution
Extended execution• Requesting extended execution• There is no guarantee resources are available
Extended execution has no UI
• Scenario “I have data this time”• Handle the Revoked event (1 second warning)
• Scenario “I’m a special kind of app”• These apps run indefinitely
• Special kinds of apps1. Turn-by-turn (location tracking) app2. Audio & VOIP application
There is a balance between load speed & shutdown time
Extended execution (type 1)M
em
ory
Running Extend
Suspended(5 seconds)
Request Revoked(1 second)
Suspended
No UI(short)
Suspended(No event)
Whensuspendin
g
Requesting extension in suspend• private async void OnSuspending(object sender, SuspendingEventArgs args)
{ var deferral = e.SuspendingOperation.GetDeferral(); using (var session = new ExtendedExecutionSession{ Reason = ExtendedExecutionReason.SavingData }) { session.Description = "Upload Data";
• session.Revoked += (s, e) => { Log("Save incomplete"); };
try { if (await session.RequestExtensionAsync() == ExtendedExecutionResult.Denied) // takes 3 seconds
• UploadBasicData(); else // takes 8 seconds
• await UploadDataAsync(session); Log("Save complete"); } catch { Log("Save failed"); } finally { deferral.Complete(); } } }
How Windows interacts with you app?
Suspend and resume
Background execution
Resource management
System triggers and notifications
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