自定义Dialog+OnKeyListener,该怎么解决

自定义Dialog+OnKeyListener
在FirstActivity中，点击button后，弹出一个输入密码对话框，在CustomDialog 这边实现按键输入，并判断输入的密码是否正确！
问题：怎样让CustomDialog这边无论输入密码正确与否，都要返回一个值给FirstActivity这边，因为FirstActivity这样要根据返回值来判断是否继续执行下面的函数。
CustomDialog.java

public class CustomDialog extends Dialog implements Constants{
	
	private Context mContext;
	private int iDoWhat;
	private LayoutInflater mInflater;
	private View passwordView;
	private Dialog passwordDialog;
	private int passwordValue;
	private StringBuffer strBufferPassword;
	private boolean bReturn = false;
	
	private ImageView passNormalImage1;
	private ImageView passNormalImage2;
	private ImageView passNormalImage3;
	private ImageView passNormalImage4;
	
	private dbaseManager dbase;
	private BOX_INFO_STRUCT stBoxInfo;
	
	public CustomDialog(Context context)
	{
		super(context);
		this.mContext = context;
		this.mInflater = LayoutInflater.from(mContext);
		
		strBufferPassword = new StringBuffer();
		
		setView();
		initDialog();
	}
	
	private void setView()
	{
		passwordView = mInflater.inflate(R.layout.input_password_layout, null);
		passNormalImage1 = (ImageView) passwordView.findViewById(R.id.pass_normal1_id);
		passNormalImage2 = (ImageView) passwordView.findViewById(R.id.pass_normal2_id);
		passNormalImage3 = (ImageView) passwordView.findViewById(R.id.pass_normal3_id);
		passNormalImage4 = (ImageView) passwordView.findViewById(R.id.pass_normal4_id);
	}
	
	private void initDialog()
	{
		passwordDialog = new Dialog(mContext, R.style.Theme_password);
		
		Window dialogWindow = passwordDialog.getWindow();
		dialogWindow.setGravity(Gravity.CENTER_VERTICAL);
		LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
//		params.width = LayoutParams.MATCH_PARENT;
//		params.height = LayoutParams.MATCH_PARENT;
		passwordDialog.setCancelable(true);
	
		passwordDialog.setCanceledOnTouchOutside(false);
		passwordDialog.addContentView(passwordView, params);
	}

	public void show()
	{
		passwordDialog.show();
		passwordDialog.setOnKeyListener(inputPassword);
	}
	
	private OnKeyListener inputPassword = new OnKeyListener() {
		public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) 
		{
			if (event.getAction() == KeyEvent.ACTION_DOWN)
			{
				switch (keyCode) {
				case KEY_0:
//					System.out.println("It's 0");
					SetImageAlpha(0);
					break;
				case KEY_1:
//					System.out.println("It's 1");
					SetImageAlpha(1);
					break;
				case KEY_2:
//					System.out.println("It's 2");
					SetImageAlpha(2);
					break;
				case KEY_3:
//					System.out.println("It's 3");
					SetImageAlpha(3);
					break;
				case KEY_4:
//					System.out.println("It's 4");
					SetImageAlpha(4);
					break;
				case KEY_5:
//					System.out.println("It's 5");
					SetImageAlpha(5);
					break;
				case KEY_6:
//					System.out.println("It's 6");
					SetImageAlpha(6);
					 break;
				case KEY_7: