Android入门之PopupWindow用法实例解析

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package com.testAlertDialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.Editable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.PopupWindow;


public class testAlertDialog extends Activity {
 Button btnPopupWindow;
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //定义按钮
    btnPopupWindow=(Button)this.findViewById(R.id.Button01);
    btnPopupWindow.setOnClickListener(new ClickEvent());
  }
  
  
  //统一处理按键事件
  class ClickEvent implements OnClickListener{

   @Override
   public void onClick(View v) {
   // TODO Auto-generated method stub
   if(v==btnPopupWindow)
   {
    showPopupWindow(testAlertDialog.this,
     testAlertDialog.this.findViewById(R.id.Button01));
   }
   }
  }

 public void showPopupWindow(Context context,View parent){
 LayoutInflater inflater = (LayoutInflater)  
    context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  
   final View vPopupWindow=inflater.inflate(R.layout.popupwindow, null, false);
   final PopupWindow pw= new PopupWindow(vPopupWindow,300,300,true);

   //OK按钮及其处理事件
    Button btnOK=(Button)vPopupWindow.findViewById(R.id.BtnOK);
    btnOK.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  //设置文本框内容
    EditText edtUsername=(EditText)vPopupWindow.findViewById(R.id.username_edit);
    edtUsername.setText("username");
    EditText edtPassword=(EditText)vPopupWindow.findViewById(R.id.password_edit);
    edtPassword.setText("password");
  }
    });
    
   //Cancel按钮及其处理事件
    Button btnCancel=(Button)vPopupWindow.findViewById(R.id.BtnCancel);
    btnCancel.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  pw.dismiss();//关闭
  }
    });
    //显示popupWindow对话框
   pw.showAtLocation(parent, Gravity.CENTER, 0, 0);
 }
}