auto-detect composer language from keyboard

adds a new expo-keyboard-language native module that reads the current keyboard language on iOS (via first responder's textInputMode) and Android (via InputMethodManager). iOS also gets real-time updates when the keyboard language changes. users opt in via Settings > Languages > "Automatically detect post language from keyboard" (native only, marked experimental). when enabled, the composer language tracks the keyboard language. users can override per-session by selecting a language manually, and re-enable auto mode via the "Automatic" item in the language menu. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-02-28 16:00:45 +02:00
parent 6cdc1fe2b5
commit d1666345ae
15 changed files with 395 additions and 40 deletions
@@ -0,0 +1,39 @@
+apply plugin: 'com.android.library'
+
+group = 'expo.modules.keyboardlanguage'
+version = '1.0.0'
+
+def expoModulesCorePlugin = new File(project(":expo-modules-core").projectDir.absolutePath, "ExpoModulesCorePlugin.gradle")
+apply from: expoModulesCorePlugin
+applyKotlinExpoModulesCorePlugin()
+useCoreDependencies()
+useExpoPublishing()
+
+def useManagedAndroidSdkVersions = false
+if (useManagedAndroidSdkVersions) {
+  useDefaultAndroidSdkVersions()
+} else {
+  buildscript {
+    ext.safeExtGet = { prop, fallback ->
+      rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+    }
+  }
+  project.android {
+    compileSdkVersion safeExtGet("compileSdkVersion", 34)
+    defaultConfig {
+      minSdkVersion safeExtGet("minSdkVersion", 21)
+      targetSdkVersion safeExtGet("targetSdkVersion", 34)
+    }
+  }
+}
+
+android {
+  namespace "expo.modules.keyboardlanguage"
+  defaultConfig {
+    versionCode 1
+    versionName "1.0.0"
+  }
+  lintOptions {
+    abortOnError false
+  }
+}
@@ -0,0 +1,31 @@
+package expo.modules.keyboardlanguage
+
+import android.os.Build
+import android.view.inputmethod.InputMethodManager
+import androidx.core.content.getSystemService
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+
+class ExpoKeyboardLanguageModule : Module() {
+  override fun definition() =
+    ModuleDefinition {
+      Name("ExpoKeyboardLanguage")
+
+      Function("getCurrentKeyboardLanguage") {
+        val context = appContext.reactContext ?: return@Function null
+        val imm = context.getSystemService<InputMethodManager>() ?: return@Function null
+        val subtype = imm.currentInputMethodSubtype ?: return@Function null
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+          val tag = subtype.languageTag
+          if (tag.isNotEmpty()) return@Function tag
+        }
+
+        @Suppress("DEPRECATION")
+        val locale = subtype.locale
+        if (locale.isNotEmpty()) return@Function locale
+
+        return@Function null
+      }
+    }
+}