Android 对话代码出错了吗？

有人能帮我写这段代码吗。我要找的是，当用户按下按钮时，我的对话框上的按钮可以返回页面。因此，我不必按下电话返回按钮。谢谢

java文件

import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
public class DlogActivity extends Activity {
/** Called when the activity is first created. */
Dialog dialog;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dialog = new Dialog(this);
dialog.setContentView(R.layout.main2);
dialog.setTitle("This is my custom dialog box");
dialog.setCancelable(true);
Button b=(Button)findViewById(R.id.button1);
@SuppressWarnings("unused")Button button01 =(Button)findViewById(R.id.btn2);


 Intent intent = new Intent(DlogActivity.this, DlogActivity.class);
 startActivity(intent);
 finish();



                                                                                                                                                                                                                                                                                       b.setOnClickListener(new OnClickListener() {
                                                                                                                                                                                            public void onBackPressed() {   
      dialog.cancel();
    // Simply Dismiss the dialog to make it close and return to back..
            /*What you are using is not a valid construct */   
            }



        public void onClick(View v) {
            dialog.show();
        }
    });

    }

}

xml.code

  <Button
    android:id="@+id/btn2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    android:text="Button" />




   <ImageView
    android:layout_width="236dp"
    android:layout_height="220dp"
    android:layout_marginRight="100dp" android:background="@drawable/carsee"/>


   <RelativeLayout
   android:id="@+id/relativeLayout1"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent" >

   </RelativeLayout>

   </LinearLayout>

---

似乎问题出在下面的代码中

dialog.setContentView(R.layout.main2);

---

您不能这样给出布局，而是需要将布局膨胀到对话框中。

您的意思是，当用户按下对话框的按钮时，它应该消失？