Reports

I was able to get this working by following the "MyActivity" example given by @alex-aelenei, however, I also had to add a plugin to correctly update the AndroidManifest.xml file, otherwise I received the following error when starting the activity:

expo android.content.ActivityNotFoundException: Unable to find explicit activity class {example.com/expo.modules.mymodule.MyActivity}; have you declared this activity in your AndroidManifest.xml, or does your intent not match its declared <intent-filter>?

I added a file ./plugin/android/withAndroidCustomActivity.js that contains the following (taken from https://forums.expo.dev/t/how-to-create-a-plugin-that-writes-a-new-activity-in-manifes-xml/68257/6 and modified):

const { withAndroidManifest } = require("@expo/config-plugins");

const customActivity = {
  $: {
    "android:name": "expo.modules.mymodule.MyActivity",
  },
};

function addCustomActivityToMainApplication(androidManifest, attributes) {
  const { manifest } = androidManifest;

  // Check if there are any application tags
  if (!Array.isArray(manifest.application)) {
    console.warn(
      "withAndroidMainActivityAttributes: No application array in manifest?",
    );
    return androidManifest;
  }

  // Find the "application" called ".MainApplication"
  const application = manifest.application.find(
    (item) => item.$["android:name"] === ".MainApplication",
  );
  if (!application) {
    console.warn("addCustomActivityToMainApplication: No .MainApplication?");
    return androidManifest;
  }

  // Check if there are any activity tags
  const activities = application.activity;
  if (!Array.isArray(activities)) {
    console.warn(
      "addCustomActivityToMainApplication: No activity array in .MainApplication?",
    );
    return androidManifest;
  }

  // If we don't find the custom activity, add it
  // If we do find it, assume it's correct
  if (
    !activities.find(
      (item) => item.$["android:name"] === "expo.modules.mymodule.MyActivity",
    )
  ) {
    activities.push(customActivity);
  }

  return androidManifest;
}

module.exports = function withAndroidCustomActivity(config, attributes) {
  return withAndroidManifest(config, (config) => {
    config.modResults = addCustomActivityToMainApplication(
      config.modResults,
      attributes,
    );
    return config;
  });
};

and updating my app.config.js to include:

  plugins: [<other plugins (e.g. "expo-router")>, "./plugin/android/withAndroidCustomActivity.js"],

I also had to run npx expo prebuild -p android to correctly regenerate the AndroidManifest file

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