Added theme

DemoAndroid/Activities/WakeOnLanActivity.cs

@@ -7,37 +7,7 @@ using Java.Lang;
 
 namespace DemoAndroid;
 
-class BiometricCallback : BiometricPrompt.AuthenticationCallback, IDialogInterfaceOnClickListener
+[Activity(Label = "WakeOnLanActivity", MainLauncher = true, Theme = "@style/NoActionBar")]
-{
-    private Context _context;
-
-    public BiometricCallback(Context context)
-    {
-        _context = context;
-    }
-    
-    public override void OnAuthenticationError(BiometricErrorCode errorCode, ICharSequence? errString)
-    {
-        Toast.MakeText(_context, $"Authentication error: {errorCode}, {errString?.ToString()}", ToastLength.Long).Show();
-    }
-
-    public override void OnAuthenticationSucceeded(BiometricPrompt.AuthenticationResult? result)
-    {
-        Toast.MakeText(_context, "Authentication succeeded!", ToastLength.Long).Show();
-    }
-
-    public override void OnAuthenticationFailed()
-    {
-        Toast.MakeText(_context, "Authentication failed!", ToastLength.Long).Show();
-    }
-
-    public void OnClick(IDialogInterface? dialog, int which)
-    {
-        Toast.MakeText(_context, "Cancel clicked!", ToastLength.Long).Show();
-    }
-}
-
-[Activity(Label = "WakeOnLanActivity")]
 public class WakeOnLanActivity : Activity
 {
     private const int BiometricStrong = 0x0000000f;
@@ -56,30 +26,34 @@ public class WakeOnLanActivity : Activity
         var button = FindViewById<Button>(Resource.Id.btnWakeOnLan);
         button.Click += (sender, args) =>
         {
-            if (!_authenticated)
+            OnlyAuthenticated(WakePc);
-            {
-                Authenticate();
-                return;
-            }
-            
-            WakePc();
         };
     }
 
-    private void Authenticate()
+    private void OnlyAuthenticated(Action action)
     {
-        var callback = new BiometricCallback(this);
+        if (!_authenticated)
+        {
+            var callback = new BiometricCallback(this, () =>
+            {
+                _authenticated = true;
+                action();
+            });
 
-        var prompt = new BiometricPrompt.Builder(this)
+            var prompt = new BiometricPrompt.Builder(this)
-            .SetNegativeButton("Negative", MainExecutor, callback)
+                .SetNegativeButton("Annuleren", MainExecutor, callback)
-            .SetTitle("Bewijs jezelf met je vingerafdruk")
+                .SetTitle("Bewijs jezelf met je vingerafdruk")
-            .SetSubtitle("We willen zeker weten dat je niet Colinde bent")
+                .SetSubtitle("We willen zeker weten dat je niet Colinde bent")
-            .SetAllowedAuthenticators(BiometricStrong)
+                .SetAllowedAuthenticators(BiometricStrong)
-            .Build();
+                .Build();
 
-        var cancellation = new CancellationSignal();
+            var cancellation = new CancellationSignal();
 
-        prompt.Authenticate(cancellation, MainExecutor, callback);
+            prompt.Authenticate(cancellation, MainExecutor, callback);
+            return;
+        }
+
+        action();
     }
 
     private void WakePc()
@@ -112,6 +86,43 @@ public class WakeOnLanActivity : Activity
             client.Send(magicPacket, magicPacket.Length, endpoint);
         }
         
-        Toast.MakeText(this, "Computer started!", ToastLength.Long).Show();
+        Toast.MakeText(this, "Computer started!", ToastLength.Long)!.Show();
+    }
+}
+
+/// <summary>
+/// Biometric authentication callbacks
+/// https://developer.android.com/identity/sign-in/biometric-auth#java
+/// </summary>
+class BiometricCallback : BiometricPrompt.AuthenticationCallback, IDialogInterfaceOnClickListener
+{
+    private Context _context;
+    private readonly Action _onSuccess;
+
+    public BiometricCallback(Context context, Action onSuccess)
+    {
+        _context = context;
+        _onSuccess = onSuccess;
+    }
+    
+    public override void OnAuthenticationError(BiometricErrorCode errorCode, ICharSequence? errString)
+    {
+        Toast.MakeText(_context, $"Authenticatie mislukt: {errorCode}, {errString?.ToString()}", ToastLength.Long)!.Show();
+    }
+
+    public override void OnAuthenticationSucceeded(BiometricPrompt.AuthenticationResult? result)
+    {
+        Toast.MakeText(_context, "Authentication succeeded!", ToastLength.Short)!.Show();
+        _onSuccess();
+    }
+
+    public override void OnAuthenticationFailed()
+    {
+        Toast.MakeText(_context, "Authenticatie mislukt!", ToastLength.Long)!.Show();
+    }
+
+    public void OnClick(IDialogInterface? dialog, int which)
+    {
+        Toast.MakeText(_context, "Geannuleerd!", ToastLength.Long)!.Show();
     }
 }

DemoAndroid/MainActivity.cs

@@ -4,7 +4,7 @@ using QRCoder; // QRCoder-ImageSharp else it crashes
 
 namespace DemoAndroid;
 
-[Activity(Label = "@string/app_name", MainLauncher = true)]
+[Activity(Label = "@string/app_name", MainLauncher = false)]
 public class MainActivity : Activity
 {
     private string _text = "";

DemoAndroid/Resources/layout/activity_wakeonlan.xml

@@ -2,18 +2,19 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
               android:orientation="vertical"
               android:layout_width="match_parent"
-              android:layout_height="match_parent">
+              android:layout_height="match_parent"
+              android:layout_margin="5pt">
 
     <TextView android:layout_width="match_parent"
               android:layout_height="wrap_content"
-              android:text="Start PC by tapping button below" />
+              android:text="Start de computer met Wake-On-Lan door op de knop hieronder te klikken" />
 
     <Button android:id="@+id/btnWakeOnLan"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:text="Start PC"
+            android:text="Start de computer"
             android:textColor="@color/white"
-            android:background="@color/blue"
+            android:background="@color/green"
-            android:height="15pt"
+            android:height="20pt"
             android:layout_margin="10pt"/>
 </LinearLayout>

DemoAndroid/Resources/values/colors.xml

@@ -2,4 +2,5 @@
 <resources>
     <color name="blue">#4287f5</color>
     <color name="white">#FFFFFF</color>
+    <color name="green">#2abf39</color>
 </resources>

DemoAndroid/Resources/values/strings.xml

@@ -1,4 +1,4 @@
 <resources>
-    <string name="app_name">DemoAndroid</string>
+    <string name="app_name">Start computer</string>
     <string name="app_text">Hello, Android!</string>
 </resources>

DemoAndroid/Resources/values/style.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="NoActionBar" parent="@android:style/Theme.Material.Light.DarkActionBar">
+        <item name="android:windowActionBar">false</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowFullscreen">true</item>
+    </style>
+</resources>