Update:
It's playing well, but when finished playing it's not showing the play button. I have tried I couldn't get it well. Maybe I spiked something else were.
How can I show the play button when a player finished playing?
HomePage.xaml
<Button ImageSource="{Binding PlayIcon}"
Command="{Binding PlayCommand}"
HorizontalOptions="End"
VerticalOptions="End"/>
HomePage.xaml.cs
public HomePage()
{
InitializeComponent();
isPlaying = true;
}
private bool isPlaying;
public bool IsPlaying
{
get { return isPlaying; }
set
{
isPlaying = value;
OnPropertyChanged(nameof(PlayIcon));
}
}
public string PlayIcon { get => isPlaying ? "play.png" : "pause.png"; }
public ICommand PlayCommand => new Command(Play);
private async void Play()
{
if (isPlaying)
{
await CrossMediaManager.Current.Play("file:///android_asset/running.mp3");
IsPlaying = true; ;
}
else
{
await CrossMediaManager.Current.Pause();
IsPlaying = false; ;
}
}
Thank you for your contribution.
to play an asset, use this syntax
private async void PlayButtonClicked(object sender, EventArgs e)
{
// update the button's image
((Button)sender).ImageSource = ImageSource.FromFile("pause.png");
wait CrossMediaManager.Current.Play("file:///android_asset/long-test.mp3");
}
ref: https://github.com/Baseflow/XamarinMediaManager/issues/840
the docs contains a list of events supported by the control, including a MediaItemFinished event
Related
I try to exit 'lock task mode' in Xamarin Android app. Here is what I am trying to achieve:
User taps on label (view in Xamarin.Forms) -> it cause change in ViewModel's boolean property to true
MainActivity (Xamarin.Android) observe that property has changed to true -> it makes application exit 'lock task mode'
My viewModel is placed in Xamarin.Forms 'App.xaml' class so it is accessible in Forms and Android part.
How Can I notify my Activity that property has changed so it can exit locked mode? I know this is propably very poor workaround, I would love to hear any advices and tips to make it more professional.
Thank you in advance!
EDIT
So the point is that I have got ViewModel with boolean property exitLockMode which indicates if app should be in lock mode or not:
public class AdminViewModel : BaseViewModel
{
//Number of taps to touch at main banner in 'MainPage' to open Admin Window
private int _tapsRequiredToAdmin = 5;
//Number of tolerance in miliseconds between next taps
private int _toleranceInMs = 1000;
private bool _exitLockMode = false;
public int ToleranceInMs { get => _toleranceInMs; }
public int TapsRequiredToAdmin { get => _tapsRequiredToAdmin; }
public bool ExitLockMode
{
get => _exitLockMode;
set => _exitLockMode=value;
}
}
AdminViewModel is created in 'App.xaml' class:
public partial class App : Application
{
private static AdminViewModel _adminViewModel;
public App()
{
InitializeComponent();
MainPage = new NavigationPage(new MainPage());
}
public static AdminViewModel AdminViewModel
{
get
{
if(_adminViewModel == null )
_adminViewModel = new AdminViewModel();
return _adminViewModel;
}
}
protected override void OnStart() { }
protected override void OnSleep() { }
protected override void OnResume() { }
}
In my main view (Xamarin.Forms) I have got label where admin want to tap few times in order to exit lock mode:
private DateTime? LastTap = null;
private byte NumberOfTaps = 0;
AdminViewModel adminViewModel = App.AdminViewModel;
**********************************************
//This is method binded to Label in <TapGestureRecognizer Tapped="OnLabelTapped">
private async void OnLabelTapped(object sender, EventArgs e)
{
if (LastTap == null || (DateTime.Now - LastTap.Value).TotalMilliseconds < adminViewModel.ToleranceInMs)
{
if (NumberOfTaps == (adminViewModel.TapsRequiredToAdmin - 1))
{
NumberOfTaps = 0;
LastTap = null;
adminViewModel.ExitLockMode = true;
return;
}
else
{
NumberOfTaps++;
LastTap = DateTime.Now;
}
}
else
{
NumberOfTaps = 1;
LastTap = DateTime.Now;
}
}
Now I want to achieve that when I turn 'ExitLockMode' bool to true, it notify my 'MainActivity' (Xamarin.Android) to fire 'StopLockTask()' method. I know that in native Android it could be handled by observing bool property, but I don't know how to do it here.
I am newbie so it could be very messy, every help appreciated.
As Jason said, you can use messagecenter.The Xamarin.Forms MessagingCenter class implements the publish-subscribe pattern, allowing message-based communication between components that are inconvenient to link by object and type references.
This mechanism allows publishers and subscribers to communicate without having a reference to each other, helping to reduce dependencies between them.
You can follow this document and the sample in it https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/messaging-center
Hi StackOverflow Team,
I am trying to run a background process in my App. This background process should update just Background image on one of the pages in the App every 15 seconds. So far, I tried to create a timer in the App OnStart() method and update the backgroundimage of the page in the BeginInvokeOnMainThread() method but with no success. Can anyone help me with this?
My Code -
{
private static Stopwatch stopWatch = new Stopwatch();
private const int defaultTimespan = 20;
private readonly HomePage homePage;
public App()
{
InitializeComponent();
try
{
MainPage = new MainPage();
homePage = new HomePage();
}
catch(Exception ex)
{
string str = ex.Message;
}
}
protected override void OnStart()
{
if (!stopWatch.IsRunning)
{
stopWatch.Start();
}
Device.StartTimer(new TimeSpan(0, 0, 10), () =>
{
// Logic for logging out if the device is inactive for a period of time.
if (stopWatch.IsRunning && stopWatch.Elapsed.Seconds >= defaultTimespan)
{
//prepare to perform your data pull here as we have hit the 1 minute mark
// Perform your long running operations here.
Device.BeginInvokeOnMainThread(() =>
{
// If you need to do anything with your UI, you need to wrap it in this.
// homePage.BackgroundImageSource = "goldengate.jpg";
homePage.ChangeBackgroundImage();
});
stopWatch.Restart();
}
// Always return true as to keep our device timer running.
return true;
});
}
protected override void OnSleep()
{
//stopWatch.Reset();
}
protected override void OnResume()
{
//stopWatch.Start();
}
//void ChangeHomePageImage()
//{
// Navigation.PushAsync(new HomePage(appBackground));
// Navigation.RemovePage(this);
//}
}
MainPage -
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:local="clr-namespace:Excercise.Views"
x:Class="Excercise.MainPage" IsPresented="False">
<MasterDetailPage.Master>
<local:MenuPage x:Name="menuPage"></local:MenuPage>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<NavigationPage>
<x:Arguments>
<local:HomePage x:Name="homePage"></local:HomePage>
</x:Arguments>
</NavigationPage>
</MasterDetailPage.Detail>
</MasterDetailPage>
HomePage -
public partial class HomePage : ContentPage
{
private SQLiteAsyncConnection _connection;
public HomePage()
{
InitializeComponent();
// BindingContext = new HomePageViewModel();
_connection = DependencyService.Get<ISQLiteDb>().GetConnection();
loadData("");
}
public HomePage(string BackgroundimgPath)
{
InitializeComponent();
// BindingContext = new HomePageViewModel();
_connection = DependencyService.Get<ISQLiteDb>().GetConnection();
loadData(BackgroundimgPath);
}
public HomePage(string City, string LocationKey, string StateID)
{
InitializeComponent();
_connection = DependencyService.Get<ISQLiteDb>().GetConnection();
// BindingContext = new HomePageViewModel();
try
{
// Method Calls
}
catch (Exception)
{
DisplayAlert("Error", "There was an error loading this page.", "OK");
}
}
protected override void OnAppearing()
{
this.Title = App.AppTitle;
this.firstStacklayout.Margin = new Thickness(0, (Application.Current.MainPage.Height * 0.25), 0, 0);
base.OnAppearing();
}
you are creating an instance of HomePage and trying to update it, but it is NOT the same instance that is being displayed in your MasterDetail
try something like this
var md = (MasterDetailPage)MainPage;
var nav = (NavigationPage)md.DetailPage;
var home = (HomePage)nav.CurrentPage;
home.ChangeBackgroundImage();
alternately, you could use MessagingCenter to send a message to HomePage requesting that it udpate
I need my web view to be tappable and scrolable. Once I implement on touch the scroll doesnt work. This way i managed to get it working however now i dont know how to make the web view tappable? the ButtonPress does nothing and if i use Move then i am just scrolling
This my my render in mu droid project
class ExtendedWebViewClient : WebViewClient
{
WebView _webView;
public async override void OnPageFinished(WebView view, string url)
{
try
{
_webView = view;
if (_xwebView != null)
{
view.Settings.JavaScriptEnabled = true;
await Task.Delay(100);
string result = await _xwebView.EvaluateJavaScriptAsync("(function(){return document.body.scrollHeight;})()");
_xwebView.HeightRequest = Convert.ToDouble(result);
}
base.OnPageFinished(view, url);
}
catch (Exception ex)
{
Console.WriteLine($"{ex.Message}");
}
}
public override bool ShouldOverrideUrlLoading(Android.Webkit.WebView view, IWebResourceRequest request)
{
return true;
}
}
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.WebView> e)
{
base.OnElementChanged(e);
_xwebView = e.NewElement as ExtendedWebView;
_webView = Control;
if (e.OldElement == null)
{
_webView.SetWebViewClient(new ExtendedWebViewClient());
}
if (e.OldElement != null)
{
Control.Touch -= ControlOnTouch;
Control.ScrollChange -= ControlOnScrollChange;
}
if (e.NewElement != null)
{
Control.Touch += ControlOnTouch;
Control.ScrollChange += ControlOnScrollChange;
}
}
private void ControlOnScrollChange(object sender, ScrollChangeEventArgs scrollChangeEventArgs)
{
if (scrollChangeEventArgs.ScrollY > 0 && scrollChangeEventArgs.OldScrollY == 0)
{
Control.Parent.RequestDisallowInterceptTouchEvent(true);
}
}
private void ControlOnTouch(object sender, Android.Views.View.TouchEventArgs e)
{
// Executing this will prevent the Scrolling to be intercepted by parent views
switch (e.Event.Action)
{
case MotionEventActions.Down:
Control.Parent.RequestDisallowInterceptTouchEvent(true);
break;
case MotionEventActions.Up:
Control.Parent.RequestDisallowInterceptTouchEvent(false);
break;
case MotionEventActions.ButtonPress:
Console.WriteLine("press");
break;
case MotionEventActions.Mask:
Console.WriteLine("mask");
break;
}
// Calling this will allow the scrolling event to be executed in the WebView
Control.OnTouchEvent(e.Event);
}
Instead of using the gesture recognizer on your webview, you can use the Focused event like following . It will been invoked when you tap the WebView .
var wb = new WebView
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
Source = "xxx",
};
wb.Focused += (sender, event) =>
{
//Handle your logic here!
wb.Unfocus();
};
Unfocus() is used if you want to implement your logic everytime the webview is tapped.
I am coming from an Angular 2 and a C# back end background, so for the Angular side of things I am used to working with async functions and code, as well the C# background I understand the base libraries.
I am trying to create a simple page that has a a button, and a loading gif. You click the button the loading gif appears, 10 seconds later it disappears.
I can make the loading start no problem, but the nature of the async code jumps the execution and instantly makes the gif disappear.
How do I go about starting the spinner / making a gif visible, waiting 10 seconds in a non ui-blocking manner, and then finish with a thread-safe way of ending the animation / gif visibility?
View-Model code:
public class LoadingViewModel: INotifyPropertyChanged
{
private Visibility _loadingState;
public event PropertyChangedEventHandler PropertyChanged = delegate { };
public LoadingViewModel()
{
this._loadingState = Visibility.Collapsed;
}
public Visibility LoadingState
{
get {
return this._loadingState;
}
set {
this._loadingState = value;
this.OnPropertyChanged();
}
}
public void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
// Raise the PropertyChanged event, passing the name of the property whose value has changed.
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
MainView.xaml.cs:
public LoadingViewModel LoadingViewModel { get; set; }
public MainPage()
{
this.InitializeComponent();
this.LoadingViewModel = new LoadingViewModel();
}
private async Task BeginLoading()
{
LoadingViewModel.LoadingState = Visibility.Visible;
await Task.Factory.StartNew(() =>
{
Task.Delay(TimeSpan.FromSeconds(10));
}).ContinueWith(EndLoadingState);
}
//Updated and works but is there a better way?
private async Task BeginLoading()
{
LoadingViewModel.LoadingState = Visibility.Visible;
await Task.Factory.StartNew(async () =>
{
await Task.Delay(TimeSpan.FromSeconds(10));
await EndLoadingState(); //<-- New EndLoadingState doesn't accept parms
});
}
private async void EndLoadingState(object state)
{
await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => {
LoadingViewModel.LoadingState = Visibility.Collapsed;
});
}
private async void Button_Click(object sender, RoutedEventArgs e)
{
await BeginLoading();
}
And lastly a basic stack panel with my button and image:
<StackPanel Margin="10,144,0,144">
<Button Content="Begin Loading for 10 seconds" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0" Height="157" Width="366" FontSize="22" Background="{x:Null}" BorderThickness="5" BorderBrush="#FF58FF00" Click="Button_Click"/>
<Image HorizontalAlignment="Center" Height="250" VerticalAlignment="Center" Width="250" Margin="0,25,0,0" Stretch="UniformToFill" Source="Assets/LoadingBubbles.gif" Visibility="{x:Bind Path=LoadingViewModel.LoadingState, Mode=TwoWay}"/>
</StackPanel>
First, try using a bool property in your LoadingViewModel instead of Visibility as the latter is a UI attribute. You generally don't want that in your ViewModel. If your target version of Windows 10 is 14393 or higher, you can bind it directly without a BoolToVisibilityConverter. And the binding doesn't need to be TwoWay also.
Visibility="{x:Bind Path=LoadingViewModel.IsLoading, Mode=OneWay}"
Second, XAML binding will actually take care of dispatching the updated value onto the UI thread. So you can also get rid of Dispatcher.RunAsync and have a normal void method
private void EndLoadingState(object state)
{
LoadingViewModel.IsLoading = false;
}
Finally, your BeginLoading method(best to rename it to BeginLoadingAsync) can be simplified to
private async Task BeginLoadingAsync()
{
LoadingViewModel.IsLoading = true;
await Task.Delay(TimeSpan.FromSeconds(10));
EndLoadingState();
}
Hope this helps!
I just want to know about the banner advertisements supported with Xamarin.Forms without any patch or loophole. Is there any advertisement provider who are providing their SDKs with the Xamarin.Forms?
Thanks in advance.
There are both SDK and step-by-step examples for Google AdMob for Xamarin.Android. You are going to need the Xamarin.GooglePlaySerives.Ads nuget.
I use it to show ads in my Xamarin.Forms app published at Google Play.
Here is the sample code for the android part of your application:
using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Support.V7.App;
using Android.Gms.Ads;
using Android;
namespace AdMobExample
{
[Activity (Label = "#string/app_name", MainLauncher = true)]
public class MainActivity : AppCompatActivity
{
protected AdView mAdView;
protected InterstitialAd mInterstitialAd;
protected Button mLoadInterstitialButton;
protected override void OnCreate (Bundle savedInstanceState)
{
base.OnCreate (savedInstanceState);
SetContentView (Resource.Layout.activity_main);
mAdView = FindViewById<AdView> (Resource.Id.adView);
var adRequest = new AdRequest.Builder ().Build ();
mAdView.LoadAd (adRequest);
mInterstitialAd = new InterstitialAd (this);
mInterstitialAd.AdUnitId = GetString (Resource.String.test_interstitial_ad_unit_id);
mInterstitialAd.AdListener = new AdListener (this);
mLoadInterstitialButton = FindViewById<Button> (Resource.Id.load_interstitial_button);
mLoadInterstitialButton.SetOnClickListener (new OnClickListener (this));
}
protected void RequestNewInterstitial ()
{
var adRequest = new AdRequest.Builder ().Build ();
mInterstitialAd.LoadAd (adRequest);
}
protected void BeginSecondActivity ()
{
var intent = new Intent (this, typeof(SecondActivity));
StartActivity (intent);
}
protected override void OnPause ()
{
if (mAdView != null) {
mAdView.Pause ();
}
base.OnPause ();
}
protected override void OnResume ()
{
base.OnResume ();
if (mAdView != null) {
mAdView.Resume ();
}
if (!mInterstitialAd.IsLoaded) {
RequestNewInterstitial ();
}
}
protected override void OnDestroy ()
{
if (mAdView != null) {
mAdView.Destroy ();
}
base.OnDestroy ();
}
class AdListener : Android.Gms.Ads.AdListener
{
MainActivity that;
public AdListener (MainActivity t)
{
that = t;
}
public override void OnAdClosed ()
{
that.RequestNewInterstitial ();
that.BeginSecondActivity ();
}
}
class OnClickListener : Java.Lang.Object, View.IOnClickListener
{
MainActivity that;
public OnClickListener (MainActivity t)
{
that = t;
}
public void OnClick (View v)
{
if (that.mInterstitialAd.IsLoaded) {
that.mInterstitialAd.Show ();
} else {
that.BeginSecondActivity ();
}
}
}
}
}
There is also a ste-by-step guide for AdMob ads for Xamarin.iOS:
using Google.MobileAds;
...
const string intersitialId = "<Get your ID at google.com/ads/admob>";
Interstitial adInterstitial;
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
CreateAndRequestInterstitial ();
}
public void AfterSomeTime ()
{
if (adInterstitial.IsReady)
adInterstitial.PresentFromRootViewController (navController);
}
void CreateAndRequestInterstitial ()
{
adInterstitial = new Interstitial (intersitialId);
adInterstitial.ScreenDismissed += (sender, e) => {
// Interstitial is a one time use object. That means once an interstitial is shown, HasBeenUsed
// returns true and the interstitial can't be used to load another ad.
// To request another interstitial, you'll need to create a new Interstitial object.
adInterstitial.Dispose ();
adInterstitial = null;
CreateAndRequestInterstitial ();
};
var request = Request.GetDefaultRequest ();
// Requests test ads on devices you specify. Your test device ID is printed to the console when
// an ad request is made. GADBannerView automatically returns test ads when running on a
// simulator. After you get your device ID, add it here
request.TestDevices = new [] { Request.SimulatorId.ToString () };
adInterstitial.LoadRequest (request);
}