version 1

README.md

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+<p align="center">
+  <img src="./imgs/appicon.png" width="150" />
+</p>
+
 # whatsapp-no-contact
-.NET MAUI app to start sending messages to a WhatsApp number without first adding it as a contact
+
+A [.NET MAUI](https://dotnet.microsoft.com/en-us/apps/maui) app to start sending messages to a WhatsApp number without first adding it as a contact
+
+## Disclaimer
+
+I created this app for my own entertainment and to learn about .NET MAUI. I am not responsible for any damage or malfunction
+
+## About the magic:
+
+```csharp
+await Launcher.OpenAsync($"https://wa.me/{phoneNumber}"); // 😜
+```
+
+## Building the Windows app (without installer)
+
+```shell
+msbuild /restore /t:Publish /p:configuration=Release /p:WindowsAppSDKSelfContained=true /p:Platform="Any CPU" /p:WindowsPackageType=None /p:TargetFramework=net7.0-windows10.0.19041.0 /p:PublishSingleFile=true /p:PublishReadyToRun=false
+```
+
+<p align="center">
+  <img src="./imgs/windows%20dark.png" width="300" />
+  <img src="./imgs/windows%20light.png" width="300" />
+</p>
+
+## Building the Android apk
+
+```shell
+dotnet publish -f net7.0-android -c Release
+```
+
+<p align="center">
+  <img src="./imgs/android%20dark.jpg" width="300" />
+  <img src="./imgs/android%20light.jpg" width="300" />
+</p>
+
+---
+_thanks to ChatGPT for the icon and helping me juggle fixing some obscure issues_

src/WhatsappNoContact.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31611.283
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WhatsappNoContact", "WhatsappNoContact\WhatsappNoContact.csproj", "{4E0A10C4-A938-4FB8-B2E3-221F899216B2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4E0A10C4-A938-4FB8-B2E3-221F899216B2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4E0A10C4-A938-4FB8-B2E3-221F899216B2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4E0A10C4-A938-4FB8-B2E3-221F899216B2}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{4E0A10C4-A938-4FB8-B2E3-221F899216B2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4E0A10C4-A938-4FB8-B2E3-221F899216B2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4E0A10C4-A938-4FB8-B2E3-221F899216B2}.Release|Any CPU.Deploy.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {61F7FB11-1E47-470C-91E2-47F8143E1572}
+	EndGlobalSection
+EndGlobal

src/WhatsappNoContact/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:WhatsappNoContact"
+             x:Class="WhatsappNoContact.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

src/WhatsappNoContact/App.xaml.cs

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+namespace WhatsappNoContact;
+
+public partial class App : Application
+{
+    public App()
+    {
+        InitializeComponent();
+
+        MainPage = new AppShell();
+    }
+
+    protected override Window CreateWindow(IActivationState activationState)
+    {
+
+        var window = base.CreateWindow(activationState);
+#if WINDOWS
+        const int newWidth = 400;
+        const int newHeight = 400;
+
+        window.Width = newWidth;
+        window.Height = newHeight;
+        window.MaximumHeight = newHeight;
+        window.MaximumWidth = newWidth;
+        window.MinimumHeight = newHeight;
+        window.MinimumWidth = newWidth;
+#endif
+        return window;
+
+    }
+}

src/WhatsappNoContact/AppShell.xaml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell
+    x:Class="WhatsappNoContact.AppShell"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:local="clr-namespace:WhatsappNoContact"
+    Shell.FlyoutBehavior="Disabled">
+
+    <ShellContent
+        Title="Whatsapp No Contact"
+        ContentTemplate="{DataTemplate local:MainPage}"
+        Route="MainPage" />
+
+</Shell>

src/WhatsappNoContact/AppShell.xaml.cs

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+namespace WhatsappNoContact;
+
+public partial class AppShell : Shell
+{
+	public AppShell()
+	{
+		InitializeComponent();
+	}
+}

src/WhatsappNoContact/MainPage.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="WhatsappNoContact.MainPage">
+
+    <Grid>
+        <Image Source="{AppThemeBinding Light=bg_light.jpg, Dark=bg_dark.jpg}" Aspect="AspectFill" />
+
+        <VerticalStackLayout
+            Spacing="25"
+            Padding="30,30"
+            VerticalOptions="CenterAndExpand"
+            BackgroundColor="{AppThemeBinding Light=#70707070, Dark=Transparent}"
+        >
+
+            <Label 
+                Text="Enter the phone number:" 
+                SemanticProperties.HeadingLevel="Level3"
+                SemanticProperties.Description="Enter the phone number (include coutry code)"
+                FontSize="16"
+                TextColor="White"
+            />
+            <Label 
+                Margin="0,-25,0,0"
+                Text="remember to include the coutry code" 
+                SemanticProperties.HeadingLevel="Level9"
+                FontSize="12"
+                TextColor="White"
+            />
+
+            <Entry 
+                x:Name="phoneNumber" 
+                FontSize="25"
+                Keyboard="Telephone"
+                TextChanged="OnPhoneNumberTextChanged"
+                HorizontalTextAlignment="Center"
+                ClearButtonVisibility="WhileEditing"
+                Placeholder="Phone number"
+                Completed="OnStartChatBtnClicked"
+                IsTextPredictionEnabled="False"
+                IsSpellCheckEnabled="False"
+                MaxLength="20"
+                ReturnType="Go"
+                TextColor="White"
+            />
+
+            <Button 
+                x:Name="startChatBtn"
+                Text="💬 Start chat" 
+                SemanticProperties.Hint="Stat a whatsapp chat with the number entered without creating a contact"
+                Clicked="OnStartChatBtnClicked" 
+                FontSize="30"
+                FontAttributes="Bold"
+                BackgroundColor="#41c151"
+                TextColor="White"
+                IsEnabled="False"
+            />
+
+        </VerticalStackLayout>
+    </Grid>
+</ContentPage>

src/WhatsappNoContact/MainPage.xaml.cs

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+namespace WhatsappNoContact;
+
+public partial class MainPage : ContentPage
+{
+    public MainPage()
+    {
+        InitializeComponent();
+        phoneNumber.Focus();
+    }
+
+    async void OnStartChatBtnClicked(object sender, EventArgs e)
+    {
+        string input = phoneNumber.Text?.Trim();
+        if (ValidPhoneNumber(input))
+        {
+            ChangeEnabled(false);
+
+            // Compute something with the input value
+            await Launcher.OpenAsync($"https://wa.me/{input}");
+
+            ChangeEnabled(true);
+        }
+    }
+
+    bool ValidPhoneNumber(string input) =>
+        !string.IsNullOrWhiteSpace(input) &&
+        input.Length > 1 &&
+        input.Length <= 20 &&
+        input.Select((c, idx) => (idx == 0 && c == '+') || char.IsDigit(c)).All(x => x);
+
+    bool ValidPhoneNumberCharacters(string input) =>
+        string.IsNullOrEmpty(input) ||
+        input[0] == '+' ||
+        input.Length <= 20 &&
+        input.Select((c, idx) => (idx == 0 && c == '+') || char.IsDigit(c)).All(x => x);
+
+    void ChangeEnabled(bool enabled)
+    {
+        phoneNumber.IsEnabled = enabled;
+        phoneNumber.IsReadOnly = !enabled;
+        startChatBtn.IsEnabled = enabled;
+    }
+
+
+    void OnPhoneNumberTextChanged(object sender, TextChangedEventArgs e)
+    {
+        // Get the new text value
+        string newText = e.NewTextValue;
+
+        if (string.IsNullOrEmpty(newText))
+        {
+            startChatBtn.IsEnabled = false;
+            return;
+        }
+
+        if (!ValidPhoneNumberCharacters(newText))
+        {
+            // If the new text value is not valid, revert to the old text value
+            phoneNumber.Text = e.OldTextValue;
+        }
+
+        startChatBtn.IsEnabled = ValidPhoneNumber(newText);
+    }
+}

src/WhatsappNoContact/MauiProgram.cs

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+using Microsoft.Extensions.Logging;
+using Microsoft.Maui.LifecycleEvents;
+
+namespace WhatsappNoContact;
+
+public static class MauiProgram
+{
+    public static MauiApp CreateMauiApp()
+    {
+        var builder = MauiApp.CreateBuilder();
+        builder
+            .UseMauiApp<App>()
+            .ConfigureFonts(fonts =>
+            {
+                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
+            });
+
+#if WINDOWS
+        builder.ConfigureLifecycleEvents(events =>
+        {
+            // Make sure to add "using Microsoft.Maui.LifecycleEvents;" in the top of the file 
+            events.AddWindows(windowsLifecycleBuilder =>
+            {
+                windowsLifecycleBuilder.OnWindowCreated(window =>
+                {
+                    window.ExtendsContentIntoTitleBar = false;
+                    var handle = WinRT.Interop.WindowNative.GetWindowHandle(window);
+                    var id = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(handle);
+                    var appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(id);
+                    switch (appWindow.Presenter)
+                    {
+                        case Microsoft.UI.Windowing.OverlappedPresenter overlappedPresenter:
+                            //overlappedPresenter.SetBorderAndTitleBar(false, false);
+                            overlappedPresenter.IsMaximizable = false;
+                            overlappedPresenter.IsResizable = false;
+                            break;
+                    }
+                });
+            });
+        });
+#endif
+
+#if DEBUG
+        builder.Logging.AddDebug();
+#endif
+
+        return builder.Build();
+    }
+}

src/WhatsappNoContact/Platforms/Android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

src/WhatsappNoContact/Platforms/Android/MainActivity.cs

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+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+
+namespace WhatsappNoContact;
+
+[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
+public class MainActivity : MauiAppCompatActivity
+{
+}

src/WhatsappNoContact/Platforms/Android/MainApplication.cs

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+using Android.App;
+using Android.Runtime;
+
+namespace WhatsappNoContact;
+
+[Application]
+public class MainApplication : MauiApplication
+{
+	public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+		: base(handle, ownership)
+	{
+	}
+
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}

src/WhatsappNoContact/Platforms/Android/Resources/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#512BD4</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

src/WhatsappNoContact/Platforms/MacCatalyst/AppDelegate.cs

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+using Foundation;
+
+namespace WhatsappNoContact;
+
+[Register("AppDelegate")]
+public class AppDelegate : MauiUIApplicationDelegate
+{
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}