package exam.ButtonEdit;

import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.content.*;
import android.content.res.*;
import android.media.*;
import android.util.*;

public class ButtonEdit extends Activity
{
 int a;
 int b;
 int result;
 int mSelect=0;
 
 public void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
  
  
  
  
        Button btn1 = (Button)findViewById(R.id.btn1);
        Button btn2 = (Button)findViewById(R.id.btn2);
  Button btn3 = (Button)findViewById(R.id.btn3);
  Button btn4 = (Button)findViewById(R.id.btn4);
  
  btn1.setOnClickListener(new Button.OnClickListener()
  {
   public void onClick(View v)
   {
    
    new AlertDialog.Builder(ButtonEdit.this)
    .setTitle("옵션을 선택하세요!")
    .setIcon(R.drawable.search1)
    .setItems(R.array.MainOption,new DialogInterface.OnClickListener()
    {
     public void onClick(DialogInterface dialog,int which)
     {
      String[] option= getResources().getStringArray(R.array.MainOption);
      TextView text=(TextView)findViewById(R.id.textView1);
      setContentView(R.layout.main1);
      Button btn5 = (Button)findViewById(R.id.button5);
      btn5.setOnClickListener(new Button.OnClickListener()
      {
       public void onClick(View v)
       {
        new AlertDialog.Builder(ButtonEdit.this)
        .setTitle("처음화면으로")
        .setMessage("돌아가시겠습니까?")
        
        .setPositiveButton("Yes",new DialogInterface.OnClickListener()
        {
         

         public void onClick(DialogInterface dialog,int whicButton)
     
         {
              
          
             setContentView(R.layout.main);
           

          
          
          
          
          
         }
         
         })
        .setNegativeButton("No",null)
           .show();
       
       }
      });
     }
    })
    .setNegativeButton("취소",null)
    .show(); 
    }
   });

다음화면에갔다가 back버튼을 눌리면 main화면으로 까지는 돌아옵니다.

근데 main화면이 재기능을 못하고,그냥 화면만 나오내요

조언좀 부탁드립니다ㅜ...ㅜ