自定义Dialog对话框

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="300dp"
    android:layout_height="wrap_content"
    >
<TextView
    android:layout_width="wrap_content" 
	android:layout_height="wrap_content" 
	android:text="使用者姓名："
    />
<EditText android:id="@+id/edtUserName"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text=""
    />
<TextView
    android:layout_width="wrap_content" 
	android:layout_height="wrap_content" 
	android:text="密码："
    />
<EditText android:id="@+id/edtPassword"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:inputType="textPassword"
    android:text=""
    />
<LinearLayout
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    >
<Button android:id="@+id/btnOK"
    android:layout_width="160dp" 
    android:layout_height="wrap_content" 
    android:text="确定登陆"
    />
<Button android:id="@+id/btnCancel"
    android:layout_width="80dp" 
    android:layout_height="wrap_content" 
    android:text="取消"
    />
</LinearLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<LinearLayout
    android:orientation="vertical"
    android:layout_width="0dp"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    />
<LinearLayout
    android:orientation="vertical"
    android:layout_width="0dp"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    >
<Button android:id="@+id/btnLoginDlg"
   	android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="登入系統"
    />
<TextView android:id="@+id/txtResult"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text=""
	/>
</LinearLayout>
<LinearLayout
    android:orientation="vertical"
    android:layout_width="0dp"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    />
</LinearLayout>

package tw.android;

import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

public class Main extends Activity {

	private Button mBtnLoginDlg;
	private TextView mTxtResult;
	private Dialog mLoginDlg;

	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        setupViewComponent();
    }
    
    private void setupViewComponent() {
		mBtnLoginDlg = (Button)findViewById(R.id.btnLoginDlg);
		mTxtResult = (TextView)findViewById(R.id.txtResult);

		mBtnLoginDlg.setOnClickListener(btnLoginDlgOnClkLis);
    }

    private Button.OnClickListener btnLoginDlgOnClkLis = new Button.OnClickListener() {
		public void onClick(View v) {
			mTxtResult.setText("");
			
			mLoginDlg = new Dialog(Main.this);//建立的Dialog对象必须制定它的拥有者。
			mLoginDlg.setTitle("登陆系统");
			mLoginDlg.setCancelable(false);//设置Cancelable属性，让用户无法使用“回上一页”按钮离开对话框
			mLoginDlg.setContentView(R.layout.login_dlg);
			Button loginBtnOK = (Button)mLoginDlg.findViewById(R.id.btnOK);
			Button loginBtnCancel = (Button)mLoginDlg.findViewById(R.id.btnCancel);
			loginBtnOK.setOnClickListener(loginDlgBtnOKOnClkLis);
			loginBtnCancel.setOnClickListener(loginDlgBtnCancelOnClkLis);
			mLoginDlg.show();			
		}
	};
	
    private Button.OnClickListener loginDlgBtnOKOnClkLis = new Button.OnClickListener() {
		public void onClick(View v) {
			EditText edtUserName = (EditText)mLoginDlg.findViewById(R.id.edtUserName);
			EditText edtPassword = (EditText)mLoginDlg.findViewById(R.id.edtPassword);

			mTxtResult.setText("请你输入的使用者姓名：" + edtUserName.getText().toString() +
								"密码：" + edtPassword.getText().toString());
			mLoginDlg.cancel();
		}
	};
	
    private Button.OnClickListener loginDlgBtnCancelOnClkLis = new Button.OnClickListener() {
		public void onClick(View v) {
			mTxtResult.setText("你按下\"取消\"按钮。");
			mLoginDlg.cancel();
		}
	};
}