本文实例介绍一下PopupWindow对话框。PopupWindow是阻塞对话框，只有在外部线程 或者 PopupWindow本身做退出操作才可以执行。PopupWindow完全依赖Layout做外观，在常见的开发中，PopupWindow应该会与AlertDialog常混用。
先贴出本例中运行的结果图：
main.xml的源码如下：
下图所示是PopupWindow弹出的截图，这里的PopupWindow是个登录框，点“确定”则自动填写，点“取消”则关闭PopupWindow。
popupwindow.xml的源码如下：
接下来是Java程序源码：
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);
}
}