public class CustomDialog extends Dialog {
  public CustomDialog(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
  }
  protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.custom_dialog);
    setTitle("Custom Dialog");
    TextView text = (TextView)findViewById(R.id.text);
    text.setText("Hello, this is a custom dialog!");
    ImageView image = (ImageView)findViewById(R.id.image);
    image.setImageResource(R.drawable.sepurple);
    Button buttonYes = (Button) findViewById(R.id.button_yes);
    buttonYes.setHeight(5);
    buttonYes.setOnClickListener(new Button.OnClickListener(){
      public void onClick(View v) {
        // TODO Auto-generated method stub
        dismiss();
      }
    });
    Button buttonNo = (Button) findViewById(R.id.button_no);
    buttonNo.setSingleLine(true);
    buttonNo.setOnClickListener(new Button.OnClickListener(){
      public void onClick(View v) {
        // TODO Auto-generated method stub
        dismiss();
      }
    });
  }
  //called when this dialog is dismissed
  protected void onStop() {
    Log.d("TAG","+++++++++++++++++++++++++++");
  }
}

public class CustomDialogUsage extends Activity {
  CustomDialog cd;
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    cd = new CustomDialog(this);
    Button buttonYes = (Button) findViewById(R.id.main_button);
    buttonYes.setOnClickListener(new OnClickListener(){
      public void onClick(View v) {
        // TODO Auto-generated method stub
        cd.show();
      }
    });
  }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout_root" android:orientation="horizontal"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:padding="10dp">
  <ImageView android:id="@+id/image" android:layout_width="wrap_content"
  android:layout_height="fill_parent" android:layout_marginRight="10dp"
  />
  <LinearLayout android:orientation="vertical"
  android:layout_width="fill_parent" android:layout_height="wrap_content"
  android:padding="5px">
    <TextView android:id="@+id/text" android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:textColor="#FFF" />
    <LinearLayout android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="5px">
      <Button android:id="@+id/button_yes"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text=" Yes " android:gravity="center"
      />
      <Button android:id="@+id/button_no"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text=" No " android:gravity="center"
      />
    </LinearLayout>
  </LinearLayout>
</LinearLayout>