React Native. How to remove the white screen after. splashscreen?

Question

React

In Android, how to remove the white screen after Splash Screen, without third-party libraries?
Now my Splash Screen is another Activity:

import com.facebook.react.ReactActivity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class SplashActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent intent = new Intent(this, MainActivity.class);
        startActivity(intent);
        finish();
    }
}

Answer 1

call finish before startActivity and in general why use a new activity for this?
use update theme
https://www.bignerdranch.com/blog/splash-screens-t...