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：
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<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<button android:id="@+id/button01" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="popupwindow演示"></button>
</linearlayout>
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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：
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<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:orientation="vertical" android:background="#000000">
<textview android:id="@+id/username_view"
android:layout_height="wrap_content"
android:layout_marginleft="20dip"
android:layout_marginright="20dip" android:text="用户名"
android:textappearance="?android:attr/textappearancemedium" android:layout_width="fill_parent"/>
<edittext android:id="@+id/username_edit"
android:layout_height="wrap_content"
android:layout_width="fill_parent" android:layout_marginleft="20dip"
android:layout_marginright="20dip" android:capitalize="none"
android:textappearance="?android:attr/textappearancemedium" />
<textview android:id="@+id/password_view"
android:layout_height="wrap_content"
android:layout_marginleft="20dip"
android:layout_marginright="20dip" android:text="密码"
android:textappearance="?android:attr/textappearancemedium" android:layout_width="fill_parent"/>
<edittext android:id="@+id/password_edit"
android:layout_height="wrap_content"
android:layout_width="fill_parent" android:layout_marginleft="20dip"
android:layout_marginright="20dip" android:capitalize="none"
android:password="true"
android:textappearance="?android:attr/textappearancemedium" />
<linearlayout android:id="@+id/linearlayout01" android:layout_height="wrap_content" android:layout_width="fill_parent" android:gravity="center"><button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/btnok" android:layout_weight="100" android:text="确定"></button><button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="100" android:text="取消" android:id="@+id/btncancel"></button></linearlayout>
</linearlayout>
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接下来是java程序源码：
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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);
}
}
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