Splash screen at start code example

Example 1: Android Splash Screen

//MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

//splashscreen.java

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;

public class splashscreen extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splashscreen);

        //Splash Screen duration
        int secondsDelayed = 1;
        new Handler().postDelayed(new Runnable() {
            public void run() {
                startActivity(new Intent(splashscreen.this, MainActivity.class));
                finish();
            }
        }, secondsDelayed * 3000);
    }
}

//activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

//splashscreen.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/splashlogo"

    />
      
Source: https://github.com/Lunox-Code/SplashScreen

Example 2: splashscreen dependency

import 'package:flutter/material.dart';
import 'package:splashscreen/splashscreen.dart';
void main(){
  runApp(new MaterialApp(
    home: new MyApp(),
  ));
}


class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return new SplashScreen(
      seconds: 14,
      navigateAfterSeconds: new AfterSplash(),
      title: new Text('Welcome In SplashScreen',
      style: new TextStyle(
        fontWeight: FontWeight.bold,
        fontSize: 20.0
      ),),
      image: new Image.network('https://i.imgur.com/TyCSG9A.png'),
      backgroundColor: Colors.white,
      styleTextUnderTheLoader: new TextStyle(),
      photoSize: 100.0,
      onClick: ()=>print("Flutter Egypt"),
      loaderColor: Colors.red
    );
  }
}

class AfterSplash extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
      title: new Text("Welcome In SplashScreen Package"),
      automaticallyImplyLeading: false
      ),
      body: new Center(
        child: new Text("Done!",
        style: new TextStyle(
          fontWeight: FontWeight.bold,
          fontSize: 30.0
        ),),

      ),
    );
  }
}