CODEWITHSUNDEEP
user-interfacexamarintaskindicator
LittleFunny
LittleFunny

Reputation: 8385

Xamarin form: How display activityindicator instantly while in async task?

    public async Task ShowIndicator(Func<Task> action)
    {
        actionEnabled = false;
        IndicatorVisibility = true;
        await Task.Delay(5000);
        await action.Invoke();
        IndicatorVisibility = false;
        actionEnabled = true;
    }

I am using the above code to run some Task while showing the indicator by setting the viewmodel properties of the IndicatorVisibility. If I placed the Task.Delay, it will ok but will slow down the code. If I am not placed it, the indicator won't show straightaway coz it will set to second to last indicator visibility to false.

Is it possible to wait the indicator displayed itself before execute the action from the above code?

Upvotes: 2

Views: 1626

Answers (2)

jlo-gmail
jlo-gmail

Reputation: 5038

I had the same issue. This has the exact problem, the activity indicator never appers or appears too late:

async void GoDetail(object obj)
{
    Busy = true;

    DetailsViewModel.Initialize(_items, this.SelectedItem);

    await App.Current.MainPage.Navigation.PushAsync(new xxxPage());

    Busy = false;

}

This fixes it, activity indicator appears instantly...:

async void GoDetail(object obj)
{
    Busy = true;
    Device.BeginInvokeOnMainThread(async () =>
    {
        DetailsViewModel.Initialize(_items, this.SelectedItem);

        await App.Current.MainPage.Navigation.PushAsync(new xxxPage());

        Busy = false;
    });

}

Upvotes: 2

Supun Liyanaarachchi
Supun Liyanaarachchi

Reputation: 549

Try this code

 public Task ShowIndicator(Func<Task> action)
    {
        actionEnabled = false;
        IndicatorVisibility = true;

        Device.BeginInvokeOnMainThread(async () =>
        {
            await action.Invoke();
            IndicatorVisibility = false;
            actionEnabled = true;
        });
    }

Upvotes: 0

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