I want to display awarded ad when app is starting.
I load ads under InitializeComponent(); with this code:
public MainPage()
{
InitializeComponent();
//Load Interestitial Ad
CrossMTAdmob.Current.LoadInterstitial("ca-app-pub-9688730828394396/1781454910");
//Load Rewarded Ad
CrossMTAdmob.Current.LoadRewardedVideo("ca-app-pub-9688730828394396/9667490273");
}
I have two buttons when users click on them different ads starting with this code:
private void ShowReward_OnClicked(object sender, EventArgs e)
{
CrossMTAdmob.Current.ShowRewardedVideo();
}
private void ShowInterstitial_OnClicked(object sender, EventArgs e)
{
CrossMTAdmob.Current.ShowInterstitial();
}
I try to put CrossMTAdmob.Current.ShowInterstitial(); from one button in my OnAppearing() method but when I start application, the ad does not appear with this code:
protected override void OnAppearing()
{
base.OnAppearing();
SetEvents();
CrossMTAdmob.Current.ShowInterstitial();
}
Can I get some example how to display my ad when app is starting ?
I'm the author of the plugin you are using.
You should check if the ads is actually loaded before trying to show it.
You can use
IsInterstitialLoaded()
And
IsRewardedVideoLoaded().
If these methods return true, then you can show the ads.
If the result is always false then you have to understand why they are not loaded, you can see in the output windows if you receive some error messages.
Most of the time the reason is a wrong Id.
Related
Initial Issue
I need to register ProcessLifecycleOwner as described here Xamarin.Android Architecture Components in my Application.OnCreate method.
But it had resulted in the error with 6.2.2 version of MvvmCross:
MvvmCross.Exceptions.MvxIoCResolveException: Failed to resolve type MvvmCross.ViewModels.IMvxAppStart occurred
or just stuck on the Splash Screen with 6.2.3.
Fix
Those problems were fixed by advice from Xamarin.Android mvvmcross app crashes when launching with intent filter.
[Application]
public class App : MvxAndroidApplication<Setup, Core.App>
{
public App(IntPtr reference, JniHandleOwnership transfer) :
base(reference, transfer) { }
public override void OnCreate()
{
MvxAndroidSetupSingleton
.EnsureSingletonAvailable(ApplicationContext)
.EnsureInitialized();
base.OnCreate();
}
}
Current Issue
However Splash Screen dissapeared too, only blue background from default theme was left.
A workaround I've found:
public override void OnCreate()
{
Task.Run(() => MvxAndroidSetupSingleton
.EnsureSingletonAvailable(ApplicationContext)
.EnsureInitialized());
base.OnCreate();
}
But due to parallelism it is not reliable, sometimes works, sometimes crashes.
Question
How Splash Screen can be restored?
Your approach is most likely blocking on the UI thread which us causing the UI to block during the time that the expected splash screen is suppose to show.
Try using an async event handler to allow for a non blocking UI call
[Application]
public class App : MvxAndroidApplication<Setup, Core.App> {
public App(IntPtr reference, JniHandleOwnership transfer) :
base(reference, transfer) {
EnsureInitialized = onEnsureInitialized; //Subscribe to event
}
private event EventHandler EnsureInitialized = delegate { };
private async void onEnsureInitialized(object sender, EventArgs args) {
await Task.Run(() => MvxAndroidSetupSingleton.EnsureSingletonAvailable(ApplicationContext)
.EnsureInitialized());
}
public override void OnCreate() {
EnsureInitialized(this, EventArgs.Empty); //Raise event
base.OnCreate();
}
}
I work on a Xamarin.Forms app (UWP!). It has a Master-Details architecture. The Master page has a ListView, and each item in it opens a corresponding Detail page. The first Detail page has only a WebView that plays a YouTube video upon loading. The second Detail view has just a placeholder label for now.
Where I switch from first Detail page to the second, the sound of the video from the first Detail page is still heard. And when I switch back to the first Detail page, the video loads again, and now I hear two voices. How can I stop the video upon switching to the second Detail page and resume when going back? If this is not possible, how can I just stop the video upon leaving its Detail page?
I guess I could do something in an overridden OnDisappearing() method of the detail page:
protected override void OnDisappearing()
{
MyWebView.NavigateToString(""); // This does not work, as NavigateToString() is not part of WebView.
base.OnDisappearing();
}
What can I use to stop playing video in WebView?
Could you please tell what I can use to stop playing video in WebView?
For your requirement, you could approach with injecting Eval java script.
private void Button_Clicked(object sender, EventArgs e)
{
string pausefunctionString = #"
var videos = document.querySelectorAll('video');
[].forEach.call(videos, function(video) { video.pause(); });
";
MyWebView.Eval(pausefunctionString);
}
Update
I have re-checked your issue, when you navigate to another page, the WebView has not be released correctly. If you want to stop the WebView video play, you could make it navigate to blank page via custom WebViewRenderer.
[assembly: ExportRenderer(typeof(WebView), typeof(CustomWebViewRender))]
namespace App4.UWP
{
class CustomWebViewRender : WebViewRenderer
{
private Windows.UI.Xaml.Controls.WebView _WebView;
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
{
base.OnElementChanged(e);
if (Control != null)
{
var source = Element.Source as UrlWebViewSource;
_WebView = new Windows.UI.Xaml.Controls.WebView();
SetNativeControl(_WebView);
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == WebView.SourceProperty.PropertyName)
{
var source = Element.Source as UrlWebViewSource;
if (source.Url == string.Empty)
{
_WebView.NavigateToString(string.Empty);
}
}
}
}
}
Usage
protected override void OnAppearing()
{
base.OnAppearing();
MyWebView.Source = "https://www.youtube.com";
}
protected override void OnDisappearing()
{
MyWebView.Source = string.Empty;
base.OnDisappearing();
}
Xaml
<WebView HeightRequest="500" WidthRequest="500" x:Name="MyWebView"/>
My project is built with master-detail navigation.
There are totally three pages in the list named as Resources, Contacts, and Login.
Everything works fine in iOS, but when the user presses the Droid/WinPhone devices hardware back button, the app should exit.
Is there any app-exit mechanism for Xamarin Forms which will work on all the devices.? (I mean native code not platform dependent)
Thanks in advance.
I did that on this way
In xamarin forms I added interface
public interface INativeHelper
{
void CloseApp();
}
In android project I made implementation of INativeHelper
public class NativeHelper : INativeHelper
{
public void CloseApp()
{
Android.OS.Process.KillProcess(Android.OS.Process.MyPid());
}
}
Implementation of INativeHelper in IOS
public class NativeHelper : INativeHelper
{
public void CloseApp()
{
Process.GetCurrentProcess().CloseMainWindow();
Process.GetCurrentProcess().Close();
}
}
And then just override method OnBackButtonPressed in page in Xamarin.Forms project
protected override bool OnBackButtonPressed()
{
INativeHelper nativeHelper = null;
nativeHelper = DependencyService.Get<INativeHelper>();
if (nativeHelper != null)
{
nativeHelper.CloseApp();
}
return base.OnBackButtonPressed();
}
I didn't made implementation for WinPhone, but it should be similar.
You can use a DepedencyService for closing an app when your physical back button is pressed:
In your UI (PCL), do the following:
protected override bool OnBackButtonPressed()
{
if (Device.OS == TargetPlatform.Android)
DependencyService.Get<IAndroidMethods>().CloseApp();
return base.OnBackButtonPressed();
}
Now implement the Android-specific logic in your Android project:
[assembly: Xamarin.Forms.Dependency(typeof(AndroidMethods))]
namespace Your.Namespace
{
public class AndroidMethods : IAndroidMethods
{
public void CloseApp()
{
Android.OS.Process.KillProcess(Android.OS.Process.MyPid());
}
}
}
Also create an Interface (in your UI PCL):
public interface IAndroidMethods
{
void CloseApp();
}
As far as I know there is no native way to exit the app in Xamarin application.
The only way is to use dependency service. Override OnBackButtonPressed function in your ContentPage and check it is the last page:
protected override bool OnBackButtonPressed()
{
if(navigation.NavigationStack.Count == 1)//navigation is MainPage.Navigation
DependencyService.Get<YourDependencyInterface>().CloseApp();
}
For Android in YourAndroidDependency class:
public void CloseApp()
{
(Xamarin.Forms.Forms.Context as Activity).Finish();
}
As for WinPhone I'm not sure but I believe it can be done in same way - dependency service.
Having experimented with all the above, I found that none of the above worked on a Google Pixel 3a, with latest version of Android
The command that came closest was
Android.OS.Process.KillProcess(Android.OS.Process.MyPid());
However it left the remains of the app still visible in the background.
The following worked for me when called from the Android Main Activity
public void ExitApp()
{
this.FinishAndRemoveTask();
Android.OS.Process.KillProcess(Android.OS.Process.MyPid());
}
The first line FinishAndRemoveTask removes the app from both the foreground and the background, however the Application process is still active, hence the need for the second command.
This is the more easy way found:
public void QuitApp(object sender, EventArgs args)
{
Process.GetCurrentProcess().CloseMainWindow();
Process.GetCurrentProcess().Close();
}
PS: Tested in android
You can use Environment.Exit(0);
My app connects to Facebook and Parse and it works well on simulator and android but it doesn't work on iOS.
The stop() (the Display.getCurrent() returns my current form) and start() methods of the main class are always called automatically. This caused my app (current form) disappeared in unexpected way. I thought the application was crashed but not.
When I double tap on the Home button I can see my app and when I select, it starts again. Any idea can help?
Thanks, William
When iOS app crashes or get killed, it doesn't remove the app from the recent apps you see when you double tap home button. It will only restart the app when you open it (Apps usually get killed on iOS within 10 minutes, depending on if the app is using any resources or not).
Verify that your app is indeed not crashing on iOS. Uncomment the crash reporter from the class that contains start() and stop() methods. This will send you an email if the app crashes and if you are a pro or higher CN1 subscriber.
Just for clarification, the class should look similar to this:
private Form current;
public void init(Object context) {
Display.getInstance().addEdtErrorHandler((evt) -> {
evt.consume();
Log.p("Exception in MyApp version " + Display.getInstance().getProperty("AppVersion", "1.0"));
Log.p("OS " + Display.getInstance().getPlatformName());
Log.p("Error " + evt.getSource());
Log.p("Current Form " + Display.getInstance().getCurrent().getName());
Log.e((Throwable) evt.getSource());
Log.sendLog();
});
}
public void start() {
if (current != null) {
current.show();
return;
}
new StateMachine("/theme");
}
public void stop() {
current = Display.getInstance().getCurrent();
}
public void destroy() {
}
Inside my application, I'm displaying a website using BrowserField. And when each link inside the site is selected, I need to show loading screen so that the user won't feel blank.
I was able to add the loading screen inside this method
public void documentCreated(BrowserField browserField,
ScriptEngine scriptEngine, Document document)
But the problem is only when connection is established, this method will be called and so there will be a delay before the loading screen is displayed.
So I tried implementing the ProtocolController and adding the loading screen inside this method
public void handleNavigationRequest(BrowserFieldRequest request)
But still, the loading screen is displayed after a small delay (same as when it was under documentCreated method)
This is my code snippet
public void handleNavigationRequest(BrowserFieldRequest request)
throws Exception {
if (!NetworkUtil.isNetworkAvailable()) {
Dialog.inform(Strings.NETWORK_ERROR);
} else {
UiApplication.getUiApplication().invokeAndWait(new Runnable() {
public void run() {
BaseScreen.showLoadingProgress(Strings.LOADING);
}
});
InputConnection ic = handleResourceRequest(request);
browserField.displayContent(ic, request.getURL());
}
}
I tried this outside the thread as well....Still the same is happening. For testing, I added a dialog inside this method and it was coming on the same time I'm clicking any link inside the site. Only this loading screen takes time to load.
Is there any way to make this happen ?
Also, the browser field is taking a bit longer to load the website compared to the native browser.
Am I missing something here ! Please help
I have tried the documentUnloading method as you suggested. But it is not getting triggered. Given below is the code snippet, could you please check what I'm doing wrong here...!!
protected void onUiEngineAttached(boolean attached) {
if (attached) {
BaseScreen.showLoadingProgress(Strings.LOADING);
}
super.onUiEngineAttached(attached);
}
try {
listener = new BrowserFieldListener() {
// Page starts loading...
public void documentCreated(BrowserField browserField,
ScriptEngine scriptEngine, Document document)
{
// show the loading screen
//showLoadingProgress(Strings.LOADING);
}
public void documentError(BrowserField browserField,
Document document) {
hideLoadingProgress();
Dialog.inform(Strings.NETWORK_ERROR);
}
public void documentAborted(BrowserField browserField,
Document document) {
hideLoadingProgress();
Dialog.inform(Strings.NETWORK_ERROR);
}
public void documentUnloading(BrowserField browserField,
Document document) {
BaseScreen.showLoadingProgress(Strings.LOADING);
}
// Page loaded
public void documentLoaded(BrowserField browserField,
Document document) {
// the document has loaded, hide loading popup ...
BaseScreen.hideLoadingProgress();
}
};
} catch (Exception ex) {
Dialog.inform(Strings.NETWORK_ERROR);
}
browserField.addListener(listener);
// add the browser field to a ui manager or screen
add(browserField);
// request the content
browserField.requestContent(URL);
I do this using the BrowserFieldListener (see BrowserFieldListener.html). It is slightly counter intuitive, but I display the loading screen in documentUnloading(), and remove it in documentLoaded(). When I first populate the BrowserField I also push the loading screen, and when the screen with the BrowserField is closed, I make sure the loading screen is popped too. So not a pretty solution, but it works for me.
And yes, in general, the BrowserField is slower than the Browser. I have not found a way round it. However one significant aspect is caching. Look for information on creating your own cache for the BrowserField - there is Thread on here and a KB article on the BB Web site. Sorry can't find them atm, will update when I do.
Update
As found by the OP, the caching article is here.
Further Update
Just to clarify two things:
You must associate the Listener with the BrowserField, using the addListener method.
Assuming you do the usual requestContent() for the initial load of your BrowserField, you will need to push the loading screen yourself because the first method in listener that will be invoked (assuming it has worked of course), will be documentLoaded().
A sample demonstrating how to use the Listener is included here:
listener sample