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Hi,

I have implemented a firebase analytics tool in Xamarin. forms application and I am not able to track my custom event activity. Referred some tutorials based on implemented the Interface and firebase classes. Please help me out on how to track custom events.

var analyticsService = DependencyService.Get();
analyticsService.LogEvent("app_open", "content_type", "Login Attempted"); Event name , Paramater name , Value

Thanks,

Hi guys , I have a picker and button .I want to set button visibilty after picker selected. Seems like OnSelectedChanged action of picker can not be bind to a command . i have already binding for SelectedItem property so i thought i can use this for make button visible. It is working but there is a problem : Button visibilty doesnt changing after picker first selection time. After 1. selection if i select other thing on picker it is changing.

This is my code :
// MVVM part

public bool IsLevelSelected {
        get { return _isLevelSelected; }
        set
        {
            _isLevelSelected = value;
            OnPropertyChanged(nameof(IsLevelSelected));
        }

             }
    public string SelectedLevel
    {
        get
        {
            return _selectedLevel;
        }
        set
        {
            IsLevelSelected = true;
            _selectedLevel = value;
            OnPropertyChanged(nameof(SelectedLevel));

        }
    }

//XAML

<Picker x:Name="picker" Title="Seviye seçiniz" FontAttributes="Bold" FontSize="Large" Margin="0,50,0,0"
SelectedItem="{Binding SelectedLevel}" HorizontalOptions=" >
<Button Text="{Binding SelectedLevel,StringFormat='{0}. Leveli Başlat'}" d:Text="1.ci Leveli Başlat"
Command="{Binding StartGame}"
HeightRequest="100" Margin="20,40,20,20"
BorderWidth="5" BackgroundColor="DarkKhaki"
IsVisible="{Binding IsLevelSelected}"
CornerRadius="25" CommandParameter="{Binding SelectedLevel}"

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I've been experiencing this issue with my current app after setting target framework to android:targetSdkVersion="29". I've double checked that this happens with a sample application for easier debugging. This is replicated with the WorkingWithNavigation sample app.

Anytime a page is pushed or popped off the navigation stack this error occurs. I'm assuming this has to do with the animation of the navigation.
Any ideas or thoughts on how to fix this issue?

11-09 11:57:51.138 W/avigation.Droi(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): 11-09 11:57:51.139 E/FragmentManager(18447): Accessing hidden field Landroid/view/animation/Animation;->mListener:Landroid/view/animation/Animation$AnimationListener; (greylist-max-p, reflection, denied)
No field with the name mListener is found in Animation class
java.lang.NoSuchFieldException: No field mListener in class Landroid/view/animation/Animation; (declaration of 'android.view.animation.Animation' appears in /system/framework/framework.jar!classes3.dex)
at java.lang.Class.getDeclaredField(Native Method)
at android.support.v4.app.FragmentManagerImpl.getAnimationListener(FragmentManager.java:1301)
at android.support.v4.app.FragmentManagerImpl.setHWLayerAnimListenerIfAlpha(FragmentManager.java:1283)
at android.support.v4.app.FragmentManagerImpl.completeShowHideFragment(FragmentManager.java:1746)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1822)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)