为何setResult(RESULT_OK,data)回传不了值

为什么setResult(RESULT_OK,data)回传不了值？
public class TestActivity extends Activity {
  /** Called when the activity is first created. */
private Button button1=null;
private TextView txtView=null;
private EditText editText1=null;
 
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
   
  this.button1=(Button)findViewById(R.id.button1);
  this.txtView=(TextView)findViewById(R.id.txtView);
   
  this.button1.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(TestActivity.this,data.class);
startActivityForResult(intent,1333);
}
  });
  }
   
  protected void OnActivityResult(int requestCode, int resultCode, Intent data){
  super.onActivityResult(requestCode, resultCode, data);
  String msg=data.getExtras().getString("data");
  Bundle bundle=data.getExtras();
  String mm=bundle.getString("data");
  this.txtView.setText(mm);

  }
   
}



public class data extends Activity{
private Button button3=null;
private EditText editText2=null;
@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.data);
   
  this.button3=(Button)findViewById(R.id.button3);
  this.editText2=(EditText)findViewById(R.id.editText2);
   
  this.button3.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent data=new Intent();
Bundle bundle=new Bundle();
bundle.putString("data", editText2.getText().toString());
data.putExtras(bundle);
setResult(RESULT_OK, data);
finish();
}
  });  
}
}

------解决方案--------------------
protected void OnActivityResult写错了噢，o要小写，改成：

 protected void onActivityResult