버튼하나를 눌렀을떄의 다음 화면으로는 넘어갑니다

하지만 버튼두개중 하나를 눌렀을떄에 넘어가는것은  어떻게 해야하나요?

엑티비티는 ss,sss,main이존재합니다

자바는 Main,SS,SSS존재합니다

----자바소스----

package com.example.wine;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class Main extends Activity {

  @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         Button launch = (Button)findViewById(R.id.startBtn);  
         launch.setOnClickListener(new Button.OnClickListener(){
          public void onClick(View v){
           Intent intent = new Intent(Main.this, SS.class);
              
           startActivity(intent);
          }
         });
     }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}
----------

-----main . xml---

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#000000"
    android:orientation="vertical" >

    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src="@drawable/main" />

<Button
    android:id="@+id/startBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_marginBottom="166dp"
    android:background="#000000"
    android:text="@string/s1"
    android:textColor="#ffffff"
    android:textSize="20dp" />

    <Button
        android:id="@+id/start02Btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/startBtn"
        android:layout_alignTop="@+id/startBtn"
        android:layout_marginTop="53dp"
        android:background="#000000"
        android:text="@string/s2"
        android:textColor="#ffffff"
        android:textSize="20dp" />

</RelativeLayout>