Android中两个Activity之间数据传递及返回问题

public class MainActivity extends Activity 
{ 
  private Button mainBtn=null; 
  private final static int REQUEST_CODE=1; 
   
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) 
  { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    mainBtn=(Button)findViewById(R.id.mainBtn); 
    mainBtn.setOnClickListener(listener); 
  } 
   
  private OnClickListener listener=new OnClickListener() 
  { 
    @Override 
    public void onClick(View v) 
    { 
      Intent intent=new Intent(); 
      intent.setClass(MainActivity.this, SecondActivity.class); 
      intent.putExtra("str", "Intent Demo"); 
      startActivityForResult(intent, REQUEST_CODE); 
       
    } 
     
  }; 
 
  @Override 
  protected void onActivityResult(int requestCode, int resultCode, Intent data) 
  { 
    if (requestCode==REQUEST_CODE) 
    { 
      if (resultCode==SecondActivity.RESULT_CODE) 
      { 
        Bundle bundle=data.getExtras(); 
        String str=bundle.getString("back"); 
        Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show(); 
      } 
    } 
  } 
   
   
} 

Bundle bundle = new Bundle(); 
bundle.putString("str", "Intent Demo");
intent.putExtras(bundle);

public class SecondActivity extends Activity 
{ 
  public final static int RESULT_CODE=1; 
  private TextView secondTxt; 
  private Button secondBtn; 
   
  @Override 
  protected void onCreate(Bundle savedInstanceState) 
  { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.second); 
    Intent intent=getIntent(); 
    Bundle bundle=intent.getExtras(); 
    String str=bundle.getString("str"); 
    secOndTxt=(TextView)findViewById(R.id.secondTxt); 
    secondTxt.setText(str); 
     
    secOndBtn=(Button)findViewById(R.id.secondBtn); 
    secondBtn.setOnClickListener(listener); 
     
  } 
   
  private OnClickListener listener=new OnClickListener() 
  { 
    @Override 
    public void onClick(View v) 
    { 
      Intent intent=new Intent(); 
      intent.putExtra("back", "Back Data"); 
      setResult(RESULT_CODE, intent); 
      finish(); 
    } 
     
  }; 
}