How can I open same activity page when I click on home button and activity goes to background of emulator?

Question

When I click on the home button of the emulator my activity (Submit.java) goes to background. But when I open again my App its start from splash screen instead from the Submit.java class.

splash screen

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


        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_splash);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() 
            {
            startActivity(new Intent(SplashActivity.this,MainActivity.class));
            finish();
            }
        }, 3000);

    }