beep sound

[Acehmshim]

I am a beginner to study c #.
I want to output a beep sound.
I would like to add a beep in the source code
DisplayAlert ("Continuously Scanned Barcode", result.Text, "OK"));
using Android.Media.Tone;
I can not import.
Is there any reason not to control source code?
replay Pls

[acaliaro]

you can't use "Android" in a XF project. You should use DependencyServices for this.

[Acehmshim]

Dear
Windows 7, Visual Sudio 2017, and Cross Platform projectors
The ios projector has been deleted.
I refer to the Zxing related Dll using the reference later.
With the auto-generated App.xaml (App.xaml.cs) and Android projects only
I want to create a page (main) and generate a scanned page when I click the button.
After referring to Zxing related Dll
LoadApplication (new App ()); The error continues to occur, and the Dll reference is removed one by one.
ResolveLibraryProjectImports
System.IO.FileNotFoundException: Could not load assembly 'App8, Version = 0.0.0.0, Culture = neutral, PublicKeyToken ='. Perhaps it does not exist in the Mono for Android profile?
Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve (AssemblyNameReference reference, ReaderParameters parameters)
.....
An error has occurred.
Is there any solution to the problem?

Is there any way to easily reference the Zxing library on Android?

[acaliaro]

I have not understand your problem. Are you using Xamarin Forms or Xamarin Android?

[Acehmshim]

< MainActivity.cs >
using System;

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Xamarin.Forms;
using System.Linq;

namespace App8.Droid
{
// [Activity(Label = "App8", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
[Activity(Label = "App8", Icon = "@mipmap/icon", Theme = "@android:style/Theme.Material.Light", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected override void OnCreate(Bundle bundle)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(bundle);

        global::Xamarin.Forms.Forms.Init(this, bundle);
        LoadApplication(new App());
    }

}

}
< App.xaml >

<Application.Resources>

</Application.Resources>

< App.xaml.cs >
using System;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

[assembly: XamlCompilation (XamlCompilationOptions.Compile)]
namespace App8
{
public partial class App : Application
{
public App ()
{
InitializeComponent();

		MainPage = new MainPage();
	}

	protected override void OnStart ()
	{
		// Handle when your app starts
	}

	protected override void OnSleep ()
	{
		// Handle when your app sleeps
	}

	protected override void OnResume ()
	{
		// Handle when your app resumes
	}
}

}
< MainPage.xaml >

<StackLayout>
    <!-- Place new controls here -->
    
    <StackLayout Margin="10,10,10,10" >
        
        <Image Source="{local:ImageResource App8.SDI_Eng_Right.png}"
               WidthRequest="100"
               HeightRequest="40"
               x:Name="imgSDI"/>
        
    </StackLayout>
	    <Label Text="QR To HMI Apps" 
            HorizontalOptions="Center"
            VerticalOptions="CenterAndExpand" 
            HorizontalTextAlignment="Center"/>
    
    <Button
            Text="SCAN"
            VerticalOptions="Center" 
            HorizontalOptions="FillAndExpand"
            BackgroundColor="LightSkyBlue"
            CornerRadius="10"
            Margin="10,10,10,10"
            Clicked="BtnSCAN_Clicked" />
    <StackLayout Orientation="Horizontal" BackgroundColor="Azure" Margin="10,10,10,10">
        <Button
            Text="HOME"
            VerticalOptions="Center" 
            HorizontalOptions="FillAndExpand"
            BackgroundColor="LightSkyBlue"
            CornerRadius="10"
            Clicked="btnHOME_Clicked" />
            
        <Button
            Text="SETTING"
            VerticalOptions="Center" 
            HorizontalOptions="FillAndExpand"
            BackgroundColor="LightSkyBlue"
            CornerRadius="15"
            Clicked="btnSETTING_Clicked" />
    </StackLayout>
    
</StackLayout>

< MainPage.xaml.cs > using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Xamarin.Forms;

using Android.Media;
using Android.OS;
using ZXing.Net.Mobile.Forms;
using Android.Content;
using Android.Content.PM;

namespace App8
{
public partial class MainPage : ContentPage
{
ZXingScannerPage scanPage;
Button buttonScanDefaultOverlay;
Button buttonScanCustomOverlay;
Button buttonScanContinuously;
Button buttonScanCustomPage;
Button buttonGenerateBarcode;

    static class Constants
    {
        public static readonly string[] EQ_INFO = { "SDI_DIV_F0001", "SDI_DIV_F0002", "SDI_DIV_F0003" };

    }


    public MainPage()
	{
		InitializeComponent();

    }

    private async void BtnSCAN_Clicked(object sender, EventArgs e)
    {
        scanPage = new ZXingScannerPage();
        scanPage.OnScanResult += (result) => {
            scanPage.IsScanning = false;

            Device.BeginInvokeOnMainThread(() => {
                Navigation.PopModalAsync();
                DisplayAlert("Default Overlay Scanned Barcode", result.Text, "OK");

                String temp = result.Text;
                CheckQR(temp);
            });
        };
        await Navigation.PushAsync(scanPage);
    }
    public void CheckQR(String readQR)
    {
        for (int i = 0; i < 2; i++)
        {
            if (Constants.EQ_INFO[i].ToString() == readQR)
            {
                TonePlayGood();
            }
            else
            {
                TonePlayError();
            }
        }
    }

    ToneGenerator tg = new ToneGenerator(Android.Media.Stream.Notification, Volume.Max);
    private MediaPlayer mediaPlayer;
    public void TonePlayGood(int ToneDuration = 200)
    {

        var v = (Vibrator)Android.App.Application.Context.GetSystemService(Android.App.Application.VibratorService);
        v.Vibrate(50);
       

        DependencyService.Get<IAudio>().PlayWavFile("1ok.wav");

        tg.StartTone(Tone.Dtmf8, 500);

    }

    public void TonePlayError(int ToneDuration = 200)
    {


        tg.StartTone(Tone.SupError, 500);

    }
    public interface IAudio
    {
        bool PlayMp3File(string fileName);
        bool PlayWavFile(string fileName);
    }
    private void btnSETTING_Clicked(object sender, EventArgs e)
    {
        Navigation.PushModalAsync(new SeconePage());
    }

    private void btnHOME_Clicked(object sender, EventArgs e)
    {

    }

    public void ExcuteHMI()
    {


    }
}

}