실행결과

1. 시작화면

MainActivity.java

package com.find.bts;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    Handler handler;
    Runnable runnable;
    ImageView img;

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

        img = findViewById(R.id.img);
        img.animate().alpha(4000).setDuration(0);

        handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent dap = new Intent(MainActivity.this, Login.class);
                startActivity(dap);
                finish();
            }
        }, 4000);
    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:background="#476BB3"
    android:gravity="center"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/img"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:src="@drawable/airbts"
        android:layout_gravity="center"/>

</LinearLayout>

2. 로그인 화면

여기 구현할 때 추가한 xml