Can I create a Splash screen in Android without a package in React Native?

you’ll need to modify the Android project files directly. Here are the steps.

• Open your React Native project in your preferred code editor.

• Navigate to the android/app/src/main directory of your project.

• Create a new directory called drawable if it doesn’t already exist.
  This is where you’ll store your splash screen image.

• Place your splash screen image (usually a PNG file) inside the
  drawable directory. Make sure to use an image with the correct
  resolution for different screen densities (mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi).

• Now, you need to modify the launch_screen.xml file. If it doesn’t
  exist, create it in the android/app/src/main/res/layout directory.
  This file will define the layout for your splash screen.

  <?xml version="1.0" encoding="utf-8"?>
  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent">
      <ImageView
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:src="@drawable/splash_screen_image"
          android:scaleType="centerCrop" />
  </RelativeLayout>
  

Replace splash_screen_image with the actual name of your splash screen image file.

Open the styles.xml file located in the android/app/src/main/res/values directory. Add the following style to define the theme for your splash screen:

<style name="SplashTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">@layout/launch_screen</item>
</style>

Now, open the AndroidManifest.xml file located in the android/app/src/main directory.

Locate the <activity> tag with the android:name=".MainActivity" attribute.

Add the android:theme attribute to the <activity> tag, specifying the SplashTheme style you defined earlier:

<activity
    android:name=".MainActivity"
    android:label="@string/app_name"
    android:theme="@style/SplashTheme">

Save all the modified files and rebuild your Android project by running react-native run-android or ./gradlew clean && react-native run-android in the project root directory.