first commit

node_modules/expo-router/android/build.gradle

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+plugins {
+  id 'com.android.library'
+  id 'expo-module-gradle-plugin'
+}
+
+group = 'expo.modules.router'
+version = '55.0.4'
+
+android {
+  namespace "expo.modules.router"
+  defaultConfig {
+    versionCode 1
+    versionName "55.0.4"
+  }
+  lintOptions {
+    abortOnError false
+  }
+}
+
+dependencies {
+  implementation 'com.google.android.material:material:1.13.0'
+}

node_modules/expo-router/android/src/main/java/expo/modules/router/ExpoRouterModule.kt

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+package expo.modules.router
+
+import android.content.Context
+import android.content.res.Configuration
+import android.graphics.Color
+import expo.modules.kotlin.exception.Exceptions
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+import androidx.appcompat.view.ContextThemeWrapper
+import com.google.android.material.color.MaterialColors
+
+class ExpoRouterModule : Module() {
+  private val context: Context
+    get() = appContext.reactContext ?: throw Exceptions.ReactContextLost()
+
+  override fun definition() = ModuleDefinition {
+    Name("ExpoRouter")
+
+    Function("Material3Color") { name: String, scheme: String ->
+      materialColor(name, scheme)
+    }
+
+    Function("Material3DynamicColor") { name: String, scheme: String ->
+      dynamicColor(name, scheme)
+    }
+  }
+
+  private fun materialColor(name: String, scheme: String): String? {
+    val scheme = if (scheme != "dark" && scheme != "light") {
+      getSystemScheme()
+    } else {
+      scheme
+    }
+
+    val theme = if (scheme == "dark") {
+      com.google.android.material.R.style.Theme_Material3_Dark
+    } else {
+      com.google.android.material.R.style.Theme_Material3_Light
+    }
+
+    return getColorFromTheme(name, theme)
+  }
+
+  private fun dynamicColor(name: String, scheme: String): String? {
+    val scheme = if (scheme != "dark" && scheme != "light") {
+      getSystemScheme()
+    } else {
+      scheme
+    }
+
+    val theme = if (scheme == "dark") {
+      com.google.android.material.R.style.Theme_Material3_DynamicColors_Dark
+    } else {
+      com.google.android.material.R.style.Theme_Material3_DynamicColors_Light
+    }
+
+    return getColorFromTheme(name, theme)
+  }
+
+  private fun getColorFromTheme(name: String, themeResId: Int): String? {
+    val wrappedContext = ContextThemeWrapper(context, themeResId)
+    val attr = attrMap[name.lowercase()]
+      ?: return null
+
+    return MaterialColors.getColorOrNull(wrappedContext, attr)?.let { colorToHex(it) }
+  }
+
+  private fun getSystemScheme(): String {
+    val currentNightMode =
+      context.resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
+    return when (currentNightMode) {
+      Configuration.UI_MODE_NIGHT_YES -> "dark"
+      Configuration.UI_MODE_NIGHT_NO -> "light"
+      else -> "light"
+    }
+  }
+
+  companion object {
+    fun colorToHex(color: Int): String {
+      return String.format("#%02x%02x%02x", Color.red(color), Color.green(color), Color.blue(color))
+    }
+
+    val attrMap = mapOf(
+      // Some of the colors are androidx.appcompat.*
+      // https://github.com/material-components/material-components-android/issues/4709
+      "primary" to androidx.appcompat.R.attr.colorPrimary,
+      "onprimary" to com.google.android.material.R.attr.colorOnPrimary,
+      "primarycontainer" to com.google.android.material.R.attr.colorPrimaryContainer,
+      "onprimarycontainer" to com.google.android.material.R.attr.colorOnPrimaryContainer,
+      "primaryinverse" to com.google.android.material.R.attr.colorPrimaryInverse,
+      "primaryfixed" to com.google.android.material.R.attr.colorPrimaryFixed,
+      "primaryfixeddim" to com.google.android.material.R.attr.colorPrimaryFixedDim,
+      "onprimaryfixed" to com.google.android.material.R.attr.colorOnPrimaryFixed,
+      "onprimaryfixedvariant" to com.google.android.material.R.attr.colorOnPrimaryFixedVariant,
+      "secondary" to com.google.android.material.R.attr.colorSecondary,
+      "onsecondary" to com.google.android.material.R.attr.colorOnSecondary,
+      "secondarycontainer" to com.google.android.material.R.attr.colorSecondaryContainer,
+      "onsecondarycontainer" to com.google.android.material.R.attr.colorOnSecondaryContainer,
+      "secondaryfixed" to com.google.android.material.R.attr.colorSecondaryFixed,
+      "secondaryfixeddim" to com.google.android.material.R.attr.colorSecondaryFixedDim,
+      "onsecondaryfixed" to com.google.android.material.R.attr.colorOnSecondaryFixed,
+      "onsecondaryfixedvariant" to com.google.android.material.R.attr.colorOnSecondaryFixedVariant,
+      "tertiary" to com.google.android.material.R.attr.colorTertiary,
+      "ontertiary" to com.google.android.material.R.attr.colorOnTertiary,
+      "tertiarycontainer" to com.google.android.material.R.attr.colorTertiaryContainer,
+      "ontertiarycontainer" to com.google.android.material.R.attr.colorOnTertiaryContainer,
+      "tertiaryfixed" to com.google.android.material.R.attr.colorTertiaryFixed,
+      "tertiaryfixeddim" to com.google.android.material.R.attr.colorTertiaryFixedDim,
+      "ontertiaryfixed" to com.google.android.material.R.attr.colorOnTertiaryFixed,
+      "ontertiaryfixedvariant" to com.google.android.material.R.attr.colorOnTertiaryFixedVariant,
+      "error" to androidx.appcompat.R.attr.colorError,
+      "onerror" to com.google.android.material.R.attr.colorOnError,
+      "errorcontainer" to com.google.android.material.R.attr.colorErrorContainer,
+      "onerrorcontainer" to com.google.android.material.R.attr.colorOnErrorContainer,
+      "outline" to com.google.android.material.R.attr.colorOutline,
+      "outlinevariant" to com.google.android.material.R.attr.colorOutlineVariant,
+      "background" to android.R.attr.colorBackground,
+      "onbackground" to com.google.android.material.R.attr.colorOnBackground,
+      "surface" to com.google.android.material.R.attr.colorSurface,
+      "onsurface" to com.google.android.material.R.attr.colorOnSurface,
+      "surfacevariant" to com.google.android.material.R.attr.colorSurfaceVariant,
+      "onsurfacevariant" to com.google.android.material.R.attr.colorOnSurfaceVariant,
+      "surfaceinverse" to com.google.android.material.R.attr.colorSurfaceInverse,
+      "onsurfaceinverse" to com.google.android.material.R.attr.colorOnSurfaceInverse,
+      "surfacebright" to com.google.android.material.R.attr.colorSurfaceBright,
+      "surfacedim" to com.google.android.material.R.attr.colorSurfaceDim,
+      "surfacecontainer" to com.google.android.material.R.attr.colorSurfaceContainer,
+      "surfacecontainerlow" to com.google.android.material.R.attr.colorSurfaceContainerLow,
+      "surfacecontainerlowest" to com.google.android.material.R.attr.colorSurfaceContainerLowest,
+      "surfacecontainerhigh" to com.google.android.material.R.attr.colorSurfaceContainerHigh,
+      "surfacecontainerhighest" to com.google.android.material.R.attr.colorSurfaceContainerHighest
+    )
+  }
+}