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> |
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> |
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); }} |
