iOS can run

android/app/src/debug/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
+
+    <application android:usesCleartextTraffic="true" tools:targetApi="28" tools:ignore="GoogleAppIndexingWarning" />
+</manifest>

android/app/src/debug/java/com/tooot/ReactNativeFlipper.java

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * <p>This source code is licensed under the MIT license found in the LICENSE file in the root
+ * directory of this source tree.
+ */
+package com.tooot;
+
+import android.content.Context;
+import com.facebook.flipper.android.AndroidFlipperClient;
+import com.facebook.flipper.android.utils.FlipperUtils;
+import com.facebook.flipper.core.FlipperClient;
+import com.facebook.flipper.plugins.crashreporter.CrashReporterPlugin;
+import com.facebook.flipper.plugins.databases.DatabasesFlipperPlugin;
+import com.facebook.flipper.plugins.fresco.FrescoFlipperPlugin;
+import com.facebook.flipper.plugins.inspector.DescriptorMapping;
+import com.facebook.flipper.plugins.inspector.InspectorFlipperPlugin;
+import com.facebook.flipper.plugins.network.FlipperOkhttpInterceptor;
+import com.facebook.flipper.plugins.network.NetworkFlipperPlugin;
+import com.facebook.flipper.plugins.react.ReactFlipperPlugin;
+import com.facebook.flipper.plugins.sharedpreferences.SharedPreferencesFlipperPlugin;
+import com.facebook.react.ReactInstanceManager;
+import com.facebook.react.bridge.ReactContext;
+import com.facebook.react.modules.network.NetworkingModule;
+import okhttp3.OkHttpClient;
+
+public class ReactNativeFlipper {
+  public static void initializeFlipper(Context context, ReactInstanceManager reactInstanceManager) {
+    if (FlipperUtils.shouldEnableFlipper(context)) {
+      final FlipperClient client = AndroidFlipperClient.getInstance(context);
+      client.addPlugin(new InspectorFlipperPlugin(context, DescriptorMapping.withDefaults()));
+      client.addPlugin(new ReactFlipperPlugin());
+      client.addPlugin(new DatabasesFlipperPlugin(context));
+      client.addPlugin(new SharedPreferencesFlipperPlugin(context));
+      client.addPlugin(CrashReporterPlugin.getInstance());
+      NetworkFlipperPlugin networkFlipperPlugin = new NetworkFlipperPlugin();
+      NetworkingModule.setCustomClientBuilder(
+          new NetworkingModule.CustomClientBuilder() {
+            @Override
+            public void apply(OkHttpClient.Builder builder) {
+              builder.addNetworkInterceptor(new FlipperOkhttpInterceptor(networkFlipperPlugin));
+            }
+          });
+      client.addPlugin(networkFlipperPlugin);
+      client.start();
+      // Fresco Plugin needs to ensure that ImagePipelineFactory is initialized
+      // Hence we run if after all native modules have been initialized
+      ReactContext reactContext = reactInstanceManager.getCurrentReactContext();
+      if (reactContext == null) {
+        reactInstanceManager.addReactInstanceEventListener(
+            new ReactInstanceManager.ReactInstanceEventListener() {
+              @Override
+              public void onReactContextInitialized(ReactContext reactContext) {
+                reactInstanceManager.removeReactInstanceEventListener(this);
+                reactContext.runOnNativeModulesQueueThread(
+                    new Runnable() {
+                      @Override
+                      public void run() {
+                        client.addPlugin(new FrescoFlipperPlugin());
+                      }
+                    });
+              }
+            });
+      } else {
+        client.addPlugin(new FrescoFlipperPlugin());
+      }
+    }
+  }
+}

android/app/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.xmflsct.app.tooot">
+  <uses-permission android:name="android.permission.INTERNET"/>
+  <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
+  <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
+  <uses-permission android:name="android.permission.USE_FINGERPRINT"/>
+  <uses-permission android:name="android.permission.USE_BIOMETRIC"/>
+  <uses-permission android:name="android.permission.VIBRATE"/>
+  <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
+  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
+  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+  <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION"/>
+  <uses-permission android:name="android.permission.CAMERA"/>
+  <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+  <uses-permission android:name="android.permission.READ_CONTACTS"/>
+  <uses-permission android:name="android.permission.WRITE_CONTACTS"/>
+  <uses-permission android:name="android.permission.READ_CALENDAR"/>
+  <uses-permission android:name="android.permission.WRITE_CALENDAR"/>
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+  <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
+  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+  <uses-permission android:name="android.permission.WAKE_LOCK"/>
+  <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>
+  <application android:name=".MainApplication" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:roundIcon="@mipmap/ic_launcher_round" android:allowBackup="true" android:theme="@style/AppTheme">
+    <meta-data android:name="expo.modules.updates.EXPO_UPDATE_URL" android:value="https://exp.host/@xmflsct/tooot"/>
+    <meta-data android:name="expo.modules.updates.EXPO_SDK_VERSION" android:value="40.0.0"/>
+    <meta-data android:name="expo.modules.updates.ENABLED" android:value="true"/>
+    <meta-data android:name="expo.modules.updates.EXPO_UPDATES_CHECK_ON_LAUNCH" android:value="ALWAYS"/>
+    <meta-data android:name="expo.modules.updates.EXPO_UPDATES_LAUNCH_WAIT_MS" android:value="0"/>
+    <activity android:name=".MainActivity" android:label="@string/app_name" android:configChanges="keyboard|keyboardHidden|orientation|screenSize|uiMode" android:launchMode="singleTask" android:windowSoftInputMode="adjustResize" android:theme="@style/Theme.App.SplashScreen" android:screenOrientation="portrait">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN"/>
+        <category android:name="android.intent.category.LAUNCHER"/>
+      </intent-filter>
+      <intent-filter>
+        <action android:name="android.intent.action.VIEW"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <category android:name="android.intent.category.BROWSABLE"/>
+        <data android:scheme="tooot"/>
+        <data android:scheme="com.xmflsct.app.tooot"/>
+      </intent-filter>
+    </activity>
+    <activity android:name="com.facebook.react.devsupport.DevSettingsActivity"/>
+  </application>
+  <uses-permission android:name="android.permission.RECORD_AUDIO" />
+</manifest>

android/app/src/main/java/com/xmflsct/app/tooot/MainActivity.java

@@ -0,0 +1,54 @@
+package com.xmflsct.app.tooot;
+import android.content.res.Configuration;
+import android.content.Intent;
+
+import android.os.Bundle;
+
+import com.facebook.react.ReactActivity;
+import com.facebook.react.ReactActivityDelegate;
+import com.facebook.react.ReactRootView;
+import com.swmansion.gesturehandler.react.RNGestureHandlerEnabledRootView;
+
+import expo.modules.splashscreen.singletons.SplashScreen;
+import expo.modules.splashscreen.SplashScreenImageResizeMode;
+
+
+public class MainActivity extends ReactActivity {
+
+    // Added automatically by Expo Config
+    @Override
+    public void onConfigurationChanged(Configuration newConfig) {
+        super.onConfigurationChanged(newConfig);
+        Intent intent = new Intent("onConfigurationChanged");
+        intent.putExtra("newConfig", newConfig);
+        sendBroadcast(intent);
+    }
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    // SplashScreen.show(...) has to be called after super.onCreate(...)
+    // Below line is handled by '@expo/configure-splash-screen' command and it's discouraged to modify it manually
+    SplashScreen.show(this, SplashScreenImageResizeMode.CONTAIN, ReactRootView.class, false);
+  }
+
+
+    /**
+     * Returns the name of the main component registered from JavaScript.
+     * This is used to schedule rendering of the component.
+     */
+    @Override
+    protected String getMainComponentName() {
+        return "main";
+    }
+
+    @Override
+    protected ReactActivityDelegate createReactActivityDelegate() {
+        return new ReactActivityDelegate(this, getMainComponentName()) {
+            @Override
+            protected ReactRootView createRootView() {
+                return new RNGestureHandlerEnabledRootView(MainActivity.this);
+            }
+        };
+    }
+}

android/app/src/main/java/com/xmflsct/app/tooot/MainApplication.java

@@ -0,0 +1,120 @@
+package com.xmflsct.app.tooot;
+
+import android.app.Application;
+import android.content.Context;
+import android.net.Uri;
+
+import com.facebook.react.PackageList;
+import com.facebook.react.ReactApplication;
+import com.facebook.react.ReactInstanceManager;
+import com.facebook.react.ReactNativeHost;
+import com.facebook.react.ReactPackage;
+import com.facebook.react.shell.MainReactPackage;
+import com.facebook.soloader.SoLoader;
+import com.xmflsct.app.tooot.generated.BasePackageList;
+
+import org.unimodules.adapters.react.ReactAdapterPackage;
+import org.unimodules.adapters.react.ModuleRegistryAdapter;
+import org.unimodules.adapters.react.ReactModuleRegistryProvider;
+import org.unimodules.core.interfaces.Package;
+import org.unimodules.core.interfaces.SingletonModule;
+import expo.modules.constants.ConstantsPackage;
+import expo.modules.permissions.PermissionsPackage;
+import expo.modules.filesystem.FileSystemPackage;
+import expo.modules.updates.UpdatesController;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.Arrays;
+import java.util.List;
+import javax.annotation.Nullable;
+
+public class MainApplication extends Application implements ReactApplication {
+  private final ReactModuleRegistryProvider mModuleRegistryProvider = new ReactModuleRegistryProvider(
+    new BasePackageList().getPackageList()
+  );
+
+  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
+    @Override
+    public boolean getUseDeveloperSupport() {
+      return BuildConfig.DEBUG;
+    }
+
+    @Override
+    protected List<ReactPackage> getPackages() {
+      List<ReactPackage> packages = new PackageList(this).getPackages();
+      packages.add(new ModuleRegistryAdapter(mModuleRegistryProvider));
+      return packages;
+    }
+
+    @Override
+    protected String getJSMainModuleName() {
+      return "index";
+    }
+
+    @Override
+    protected @Nullable String getJSBundleFile() {
+      if (BuildConfig.DEBUG) {
+        return super.getJSBundleFile();
+      } else {
+        return UpdatesController.getInstance().getLaunchAssetFile();
+      }
+    }
+
+    @Override
+    protected @Nullable String getBundleAssetName() {
+      if (BuildConfig.DEBUG) {
+        return super.getBundleAssetName();
+      } else {
+        return UpdatesController.getInstance().getBundleAssetName();
+      }
+    }
+  };
+
+  @Override
+  public ReactNativeHost getReactNativeHost() {
+    return mReactNativeHost;
+  }
+
+  @Override
+  public void onCreate() {
+    super.onCreate();
+    SoLoader.init(this, /* native exopackage */ false);
+
+    if (!BuildConfig.DEBUG) {
+      UpdatesController.initialize(this);
+    }
+
+    initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
+  }
+
+  /**
+   * Loads Flipper in React Native templates. Call this in the onCreate method with something like
+   * initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
+   *
+   * @param context
+   * @param reactInstanceManager
+   */
+  private static void initializeFlipper(
+      Context context, ReactInstanceManager reactInstanceManager) {
+    if (BuildConfig.DEBUG) {
+      try {
+        /*
+         We use reflection here to pick up the class that initializes Flipper,
+        since Flipper library is not available in release mode
+        */
+        Class<?> aClass = Class.forName("com.xmflsct.app.tooot.ReactNativeFlipper");
+        aClass
+            .getMethod("initializeFlipper", Context.class, ReactInstanceManager.class)
+            .invoke(null, context, reactInstanceManager);
+      } catch (ClassNotFoundException e) {
+        e.printStackTrace();
+      } catch (NoSuchMethodException e) {
+        e.printStackTrace();
+      } catch (IllegalAccessException e) {
+        e.printStackTrace();
+      } catch (InvocationTargetException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+}

android/app/src/main/res/drawable/splashscreen.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  This file was created by '@expo/configure-splash-screen' and some of it's content shouldn't be modified by hand
+-->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+  <item android:drawable="@color/splashscreen_background"/>
+</layer-list>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/iconBackground"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/iconBackground"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

android/app/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<resources>
+  <color name="iconBackground">#FFFFFF</color>
+  <color name="splashscreen_background">#FAFAFA</color>
+  <color name="colorPrimary">#023c69</color>
+</resources>

android/app/src/main/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<resources>
+  <string name="app_name">tooot</string>
+</resources>

android/app/src/main/res/values/styles.xml

@@ -0,0 +1,17 @@
+<?xml
+  version="1.0"
+  encoding="UTF-8"
+  standalone="yes"
+?>
+<resources>
+  <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
+    <item name="android:textColor">#000000</item>
+    <item name="colorPrimary">@color/colorPrimary</item>
+    <item name="android:windowTranslucentStatus">true</item>
+  </style>
+  <style name="Theme.App.SplashScreen" parent="Theme.AppCompat.Light.NoActionBar">
+    <!-- Below line is handled by '@expo/configure-splash-screen' command and it's discouraged to modify it manually -->
+    <!-- Customize your splash screen theme here -->
+    <item name="android:windowBackground">@drawable/splashscreen</item>
+  </style>
+</resources>