How we use Splash Screen in Android Studio.

                          Java code for simple splash screen Activity

Add this in Java class of Splash screen

getSupportActionBar().hide();

Thread thread=new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            sleep(5000);
            Intent i=new Intent(splash_screen.this,MainActivity.class);
            startActivity(i);
        }
        catch (InterruptedException e)
        {
            e.printStackTrace();
        }
    }
});
thread.start();

Change the names of Main_activity and splash_activity in manifest file with one another.

Add this in manifest file in splash activity

android:noHistory="true"