OxygenToolbox/app/src/main/java/com/fatapp/oxygentoolbox/SplashActivity.java

package com.fatapp.oxygentoolbox;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.splashscreen.SplashScreen;

@SuppressLint("CustomSplashScreen")
public class SplashActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // Handle the splash screen transition.
        SplashScreen splashScreen = SplashScreen.installSplashScreen(this);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
        new Thread() {
            @Override
            public void run() {
                try {
                    sleep(0);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                startActivity(new Intent(getApplicationContext(), MainActivity.class));
                finish();
            }
        }.start();
    }
}