fix: Handle justified text for TextBlock on Android

src/SamplesApp/UITests.Shared/UITests.Shared.projitems

@@ -1685,6 +1685,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\TextBlockControl\TextBlock_JustifiedText.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\TextBlockControl\TextBlock_Layout.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
@@ -5395,6 +5399,9 @@
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\TextBlockControl\TextBlock_IsTextSelectionEnabled.xaml.cs">
       <DependentUpon>TextBlock_IsTextSelectionEnabled.xaml</DependentUpon>
     </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\TextBlockControl\TextBlock_JustifiedText.xaml.cs">
+      <DependentUpon>TextBlock_JustifiedText.xaml</DependentUpon>
+    </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\TextBlockControl\TextBlock_Layout.xaml.cs">
       <DependentUpon>TextBlock_Layout.xaml</DependentUpon>
     </Compile>

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/TextBlockControl/TextBlock_JustifiedText.xaml

@@ -0,0 +1,18 @@
+<Page
+    x:Class="UITests.Windows_UI_Xaml_Controls.TextBlockControl.TextBlock_JustifiedText"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:UITests.Windows_UI_Xaml_Controls.TextBlockControl"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+    <Grid>
+		<TextBlock Text="Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
+					   MaxLines="4"
+					   TextWrapping="Wrap"
+					   TextAlignment="Justify"
+					   HorizontalAlignment="Left" />
+	</Grid>
+</Page>

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/TextBlockControl/TextBlock_JustifiedText.xaml.cs

@@ -0,0 +1,16 @@
+using Uno.UI.Samples.Controls;
+using Windows.UI.Xaml.Controls;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace UITests.Windows_UI_Xaml_Controls.TextBlockControl
+{
+	[Sample("TextBlockControl", "TextBlock_JustifiedText")]
+    public sealed partial class TextBlock_JustifiedText : Page
+    {
+        public TextBlock_JustifiedText()
+        {
+            this.InitializeComponent();
+        }
+    }
+}

src/Uno.UI/UI/Xaml/Controls/TextBlock/TextBlock.Android.cs

@@ -112,6 +112,7 @@ private static void InitializeStaticLayoutInterop()
 		private TextPaint _paint;
 		private TextUtils.TruncateAt _ellipsize;
 		private Android.Text.Layout.Alignment _layoutAlignment;
+		private JustificationMode _justificationMode;
 
 		/// <summary>
 		/// Used by unit tests to verify that the displayed color matches the nominal managed color.
@@ -175,15 +176,21 @@ private void UpdateLayoutAlignment()
 			{
 				case TextAlignment.Center:
 					_layoutAlignment = Android.Text.Layout.Alignment.AlignCenter;
+					_justificationMode = JustificationMode.None;
 					break;
 
 				case TextAlignment.Right:
 					_layoutAlignment = Android.Text.Layout.Alignment.AlignOpposite;
+					_justificationMode = JustificationMode.None;
+					break;
+				case TextAlignment.Justify:
+					_layoutAlignment = Android.Text.Layout.Alignment.AlignNormal;
+					_justificationMode = JustificationMode.InterWord;
 					break;
-
 				default:
 				case TextAlignment.Left:
 					_layoutAlignment = Android.Text.Layout.Alignment.AlignNormal;
+					_justificationMode = JustificationMode.None;
 					break;
 			}
 		}
@@ -404,6 +411,7 @@ private Size UpdateLayout(ref LayoutBuilder layout, Size availableSize, bool exa
 				_paint,
 				IsLayoutConstrainedByMaxLines ? TruncateEnd : _ellipsize, // .SetMaxLines() won't work on Android unless the ellipsize "END" is used.
 				_layoutAlignment,
+				_justificationMode,
 				TextWrapping,
 				MaxLines,
 				availableSize,
@@ -445,6 +453,7 @@ private class LayoutBuilder : IEquatable<LayoutBuilder>
 			private readonly Java.Lang.ICharSequence _textFormatted;
 			private readonly TextUtils.TruncateAt _ellipsize;
 			private readonly Android.Text.Layout.Alignment _layoutAlignment;
+			private readonly JustificationMode _justificationMode;
 			private readonly TextWrapping _textWrapping;
 			private readonly int _maxLines;
 			private readonly bool _exactWidth;
@@ -475,6 +484,7 @@ public LayoutBuilder(
 				TextPaint paint,
 				TextUtils.TruncateAt ellipsize,
 				Android.Text.Layout.Alignment layoutAlignment,
+				JustificationMode isJustifiedText,
 				TextWrapping textWrapping,
 				int maxLines,
 				Size availableSize,
@@ -488,6 +498,7 @@ LayoutBuilder existingBuilder
 				_paint = paint;
 				_ellipsize = ellipsize;
 				_layoutAlignment = layoutAlignment;
+				_justificationMode = isJustifiedText;
 				_textWrapping = textWrapping;
 				_maxLines = maxLines;
 				AvailableSize = availableSize;
@@ -720,6 +731,7 @@ private void MakeLayout(int width, int maxLines = int.MaxValue)
 					.SetEllipsizedWidth(width)
 					.SetAlignment(_layoutAlignment)
 					.SetIncludePad(true)
+					.SetJustificationMode(_justificationMode)
 					.Build();
 				}