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그부분 해결좀 해주세요 ...

--------------MainActivity부분-------------

package com.example.listview1;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {

 static String pos = null;

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

  setContentView(R.layout.activity_main);
  ListView list = (ListView) findViewById(R.id.lv_list);

  ArrayAdapter<CharSequence> setListAdapter = ArrayAdapter
    .createFromResource(getApplicationContext(),
      R.array.freind_list,
      android.R.layout.simple_list_item_1);
  
  list.setAdapter(setListAdapter);

  list.setOnItemClickListener(new OnItemClickListener() {
   public void onItemClick(AdapterView<?> MainActivity, View v,
     int position, long id) {
    Intent intent = new Intent(MainActivity.this, Activity01.class);
    intent.putExtra(pos, Integer.toString(position));
    startActivity(intent);
   }
  });
 }
}

------------------------Main LayOut부분-----------------------
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000" >
    <ListView
        android:id="@+id/lv_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >
       
    </ListView>

</RelativeLayout>

--------------두번째  Activity-----------

package com.example.listview1;

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

public class Activity01 extends Activity {

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity01);
    
    
     Button ButtonBtn = (Button) findViewById(R.id.btn_back);
     ButtonBtn.setOnClickListener(new View.OnClickListener() {
   
   public void onClick(View v) {
    // TODO Auto-generated method stub
    startActivity(new Intent(Activity01.this, MainActivity.class));
    finish();
   }
  });
  
 }

}

-----------------두번째 Layout ------------

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

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:background="#0055FF" >

            <Button
                android:id="@+id/btn_back"
                style="?android:attr/buttonStyleSmall"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Back" />
        </LinearLayout>

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/linearLayout1"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="46dp"
            android:text="TextView"
            android:textSize="30dp"
          >
           
        </TextView>
       

    </RelativeLayout>