Add core-ui module and Jetpack Compose.

app/build.gradle

@@ -174,6 +174,11 @@ android {
 
     buildFeatures {
         viewBinding true
+        compose true
+    }
+
+    composeOptions {
+        kotlinCompilerExtensionVersion = '1.3.2'
     }
 
     defaultConfig {
@@ -589,6 +594,8 @@ dependencies {
     implementation libs.rxdogtag
 
     androidTestUtil testLibs.androidx.test.orchestrator
+
+    implementation project(':core-ui')
 }
 
 def getLastCommitTimestamp() {

app/src/main/java/org/thoughtcrime/securesms/compose/ComposeBottomSheetDialogFragment.kt

@@ -0,0 +1,32 @@
+package org.thoughtcrime.securesms.compose
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.ComposeView
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.ViewCompositionStrategy
+import org.signal.core.ui.theme.SignalTheme
+import org.thoughtcrime.securesms.components.FixedRoundedCornerBottomSheetDialogFragment
+import org.thoughtcrime.securesms.util.DynamicTheme
+
+abstract class ComposeBottomSheetDialogFragment : FixedRoundedCornerBottomSheetDialogFragment() {
+
+  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
+    return ComposeView(requireContext()).apply {
+      setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed)
+      setContent {
+        SignalTheme(
+          isDarkMode = DynamicTheme.isDarkTheme(LocalContext.current)
+        ) {
+          SheetContent()
+        }
+      }
+    }
+  }
+
+  @Composable
+  abstract fun SheetContent()
+}

app/src/main/res/values/themes.xml

@@ -170,6 +170,7 @@
         <item name="colorOnBackground">@color/signal_colorOnBackground</item>
         <item name="colorOutline">@color/signal_colorOutline</item>
         <item name="textAppearanceBodyMedium">@style/Signal.Text.BodyMedium</item>
+        <item name="textAppearanceBodyLarge">@style/Signal.Text.BodyLarge</item>
         <item name="textAppearanceLabelLarge">@style/Signal.Text.LabelLarge</item>
 
         <item name="search_view_style">@style/Signal.SearchView</item>
@@ -258,6 +259,7 @@
         <item name="colorOnBackground">@color/signal_colorOnBackground</item>
         <item name="colorOutline">@color/signal_colorOutline</item>
         <item name="textAppearanceBodyMedium">@style/Signal.Text.BodyMedium</item>
+        <item name="textAppearanceBodyLarge">@style/Signal.Text.BodyLarge</item>
         <item name="textAppearanceLabelLarge">@style/Signal.Text.LabelLarge</item>
 
         <item name="circularProgressMaterialButtonStyle">@style/Signal.Widget.Button.Large.Tonal</item>

core-ui/build.gradle

@@ -0,0 +1,22 @@
+apply from: "$rootProject.projectDir/signalModule.gradle"
+
+android {
+    buildFeatures {
+        compose true
+    }
+
+    composeOptions {
+        kotlinCompilerExtensionVersion = '1.3.2'
+    }
+}
+
+dependencies {
+    lintChecks project(':lintchecks')
+
+    def composeBom = platform(libs.androidx.compose.bom)
+    api composeBom
+    androidTestApi composeBom
+    api libs.androidx.compose.material3
+    api libs.androidx.compose.ui.tooling.preview
+    debugApi libs.androidx.compose.ui.tooling.core
+}

core-ui/src/main/AndroidManifest.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.signal.core.ui">
+
+</manifest>

core-ui/src/main/java/org/signal/core/ui/theme/SignalTheme.kt

@@ -0,0 +1,119 @@
+package org.signal.core.ui.theme
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Typography
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.unit.sp
+
+private val typography = Typography().apply {
+  copy(
+    headlineLarge = headlineLarge.copy(
+      lineHeight = 40.sp,
+      letterSpacing = 0.sp
+    ),
+    headlineMedium = headlineMedium.copy(
+      lineHeight = 36.sp,
+      letterSpacing = 0.sp
+    ),
+    titleLarge = titleLarge.copy(
+      lineHeight = 28.sp,
+      letterSpacing = 0.sp
+    ),
+    titleMedium = titleMedium.copy(
+      fontFamily = FontFamily.SansSerif,
+      fontStyle = FontStyle.Normal,
+      fontSize = 18.sp,
+      lineHeight = 24.sp,
+      letterSpacing = 0.0125.sp
+    ),
+    titleSmall = titleSmall.copy(
+      fontSize = 16.sp,
+      lineHeight = 22.sp,
+      letterSpacing = 0.0125.sp
+    ),
+    bodyLarge = bodyLarge.copy(
+      lineHeight = 22.sp,
+      letterSpacing = 0.0125.sp
+    ),
+    bodyMedium = bodyMedium.copy(
+      lineHeight = 20.sp,
+      letterSpacing = 0.0107.sp
+    ),
+    bodySmall = bodySmall.copy(
+      fontSize = 13.sp,
+      lineHeight = 16.sp,
+      letterSpacing = 0.0192.sp
+    ),
+    labelLarge = labelLarge.copy(
+      lineHeight = 20.sp,
+      letterSpacing = 0.0107.sp
+    ),
+    labelMedium = labelMedium.copy(
+      fontSize = 13.sp,
+      lineHeight = 16.sp,
+      letterSpacing = 0.0192.sp
+    ),
+    labelSmall = labelSmall.copy(
+      lineHeight = 16.sp,
+      letterSpacing = 0.025.sp
+    )
+  )
+}
+
+private val lightColorScheme = lightColorScheme(
+  primary = Color(0xFF2C58C3),
+  primaryContainer = Color(0xFFD2DFFB),
+  secondary = Color(0xFF586071),
+  secondaryContainer = Color(0xFFDCE5F9),
+  surface = Color(0xFFFBFCFF),
+  surfaceVariant = Color(0xFFE7EBF3),
+  background = Color(0xFFFBFCFF),
+  error = Color(0xFFBA1B1B),
+  errorContainer = Color(0xFFFFDAD4),
+  onPrimary = Color(0xFFFFFFFF),
+  onPrimaryContainer = Color(0xFF051845),
+  onSecondary = Color(0xFFFFFFFF),
+  onSecondaryContainer = Color(0xFF151D2C),
+  onSurface = Color(0xFF1B1B1D),
+  onSurfaceVariant = Color(0xFF545863),
+  onBackground = Color(0xFF1B1D1D),
+  outline = Color(0xFF808389)
+)
+
+private val darkColorScheme = darkColorScheme(
+  primary = Color(0xFFB6C5FA),
+  primaryContainer = Color(0xFF464B5C),
+  secondary = Color(0xFFC1C6DD),
+  secondaryContainer = Color(0xFF414659),
+  surface = Color(0xFF1B1C1F),
+  surfaceVariant = Color(0xFF303133),
+  background = Color(0xFF1B1C1F),
+  error = Color(0xFFFFB4A9),
+  errorContainer = Color(0xFF930006),
+  onPrimary = Color(0xFF1E2438),
+  onPrimaryContainer = Color(0xFFDBE1FC),
+  onSecondary = Color(0xFF2A3042),
+  onSecondaryContainer = Color(0xFFDCE1F9),
+  onSurface = Color(0xFFE2E1E5),
+  onSurfaceVariant = Color(0xFFBEBFC5),
+  onBackground = Color(0xFFE2E1E5),
+  outline = Color(0xFF5C5E65)
+)
+
+@Composable
+fun SignalTheme(
+  isDarkMode: Boolean,
+  content: @Composable () -> Unit
+) {
+  MaterialTheme(
+    colorScheme = if (isDarkMode) darkColorScheme else lightColorScheme,
+    typography = typography,
+    content = content
+  )
+}

dependencies.gradle

@@ -15,6 +15,12 @@ dependencyResolutionManagement {
             version('libsignal-client', '0.21.1')
             version('mp4parser', '1.9.39')
 
+            // Compose
+            alias('androidx-compose-bom').to('androidx.compose:compose-bom:2022.12.00')
+            alias('androidx-compose-material3').to('androidx.compose.material3', 'material3').withoutVersion()
+            alias('androidx-compose-ui-tooling-preview').to('androidx.compose.ui', 'ui-tooling-preview').withoutVersion()
+            alias('androidx-compose-ui-tooling-core').to('androidx.compose.ui', 'ui-tooling').withoutVersion()
+
             // Desugaring
             alias('android-tools-desugar').to('com.android.tools:desugar_jdk_libs:1.1.5')