fix(app): keep tablet orientation policy in activity

Android resolves manifest resources without screen size qualifiers, so preserve the portrait declaration and unlock tablets when the activity starts.

packages/app/app.config.js

@@ -1,3 +1,4 @@
+const withAndroidOrientation = require("./plugins/with-android-orientation");
 const fs = require("node:fs");
 const path = require("node:path");
 const pkg = require("./package.json");
@@ -142,6 +143,7 @@ export default {
       searchPaths: ["../../node_modules", "./node_modules"],
     },
     plugins: [
+      withAndroidOrientation,
       "expo-router",
       withPasteInput,
       withAndroidScroll,

packages/app/app.config.test.ts

@@ -59,3 +59,31 @@ describe("Android app config", () => {
     30_000,
   );
 });
+
+it("keeps the Android manifest portrait for phone startup", async () => {
+  const manifest = await resolveAndroidManifest();
+  const activity = manifest.application[0].activity.find(
+    (entry: ManifestEntry) => entry.$["android:name"] === ".MainActivity",
+  );
+  expect(activity.$["android:screenOrientation"]).toBe("portrait");
+}, 30_000);
+
+it("updates the native orientation before launch and when screen size changes", async () => {
+  const plugin = createRequire(import.meta.url)("./plugins/with-android-orientation.js");
+  const config = plugin({ name: "test", slug: "test" });
+  const result = await config.mods.android.mainActivity({
+    modRequest: {},
+    modResults: {
+      language: "kt",
+      contents:
+        "class MainActivity {\n  override fun onCreate(savedInstanceState: Bundle?) {\n    super.onCreate(null)\n  }\n}",
+    },
+  });
+  expect(result.modResults.contents).toContain("smallestScreenWidthDp >= 600");
+  expect(result.modResults.contents).toContain("SCREEN_ORIENTATION_UNSPECIFIED");
+  expect(result.modResults.contents).toContain("SCREEN_ORIENTATION_PORTRAIT");
+  expect(result.modResults.contents).toContain(
+    "updateOrientation(resources.configuration)\n    super.onCreate(null)",
+  );
+  expect(result.modResults.contents).toContain("updateOrientation(newConfig)");
+});

packages/app/plugins/with-android-orientation.js

@@ -0,0 +1,38 @@
+const { withMainActivity } = require("expo/config-plugins");
+
+module.exports = function withAndroidOrientation(config) {
+  return withMainActivity(config, (mod) => {
+    const activity = mod.modResults;
+    if (activity.language !== "kt") throw new Error("Expected Kotlin MainActivity");
+    const marker = "  // Paseo orientation policy";
+    if (!activity.contents.includes(marker)) {
+      const anchor = "  override fun onCreate(savedInstanceState: Bundle?)";
+      if (!activity.contents.includes(anchor)) throw new Error("MainActivity anchor missing");
+      activity.contents = activity.contents.replace(
+        anchor,
+        `${marker}
+  private fun updateOrientation(configuration: android.content.res.Configuration) {
+    val orientation = if (configuration.smallestScreenWidthDp >= 600)
+      android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
+    else
+      android.content.pm.ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+    if (requestedOrientation != orientation) requestedOrientation = orientation
+  }
+
+  override fun onConfigurationChanged(newConfig: android.content.res.Configuration) {
+    super.onConfigurationChanged(newConfig)
+    updateOrientation(newConfig)
+  }
+
+${anchor}`,
+      );
+      if (!activity.contents.includes("    super.onCreate(null)"))
+        throw new Error("MainActivity onCreate missing");
+      activity.contents = activity.contents.replace(
+        "    super.onCreate(null)",
+        "    updateOrientation(resources.configuration)\n    super.onCreate(null)",
+      );
+    }
+    return mod;
+  });
+};