本文实例讲述的是alertdialog，这种对话框会经常遇到。alertdialog跟win32开发中的dialog不一样，alertdialog是非阻塞的，而阻塞的对话框用的是popupwindow。
先贴出该程序运行的截图：
main.xml的源码：
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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:text="非layout型对话框" android:layout_width="fill_parent"></button><button android:id="@+id/button02" android:layout_height="wrap_content" android:text="layout型对话框" android:layout_width="fill_parent"></button><view android:id="@+id/view01" android:layout_width="wrap_content" android:layout_height="wrap_content"></view></linearlayout> |
下图是非layout型对话框，直接使用alertdialog
下图是使用了layout的对话框，可以自定义控件，实现更复杂的对话框
dialoglayout.xml的源码：
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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"> <edittext android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_marginleft="20dip" android:layout_marginright="20dip" android:textappearance="?android:attr/textappearancemedium" android:id="@+id/edtinput"/></linearlayout> |
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.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 btnshowdialog; button btnshowdialog_layout; /** called when the activity is first created. */ @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); //定义按钮 btnshowdialog=(button)this.findviewbyid(r.id.button01); btnshowdialog.setonclicklistener(new clickevent()); btnshowdialog_layout=(button)this.findviewbyid(r.id.button02); btnshowdialog_layout.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==btnshowdialog) showdialog(testalertdialog.this); else if(v==btnshowdialog_layout) showdialog_layout(testalertdialog.this); } } //显示基本的alertdialog private void showdialog(context context) { alertdialog.builder builder = new alertdialog.builder(context); builder.seticon(r.drawable.icon); builder.settitle("title"); builder.setmessage("message"); builder.setpositivebutton("button1", new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int whichbutton) { settitle("点击了对话框上的button1"); } }); builder.setneutralbutton("button2", new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int whichbutton) { settitle("点击了对话框上的button2"); } }); builder.setnegativebutton("button3", new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int whichbutton) { settitle("点击了对话框上的button3"); } }); builder.show(); } //显示基于layout的alertdialog private void showdialog_layout(context context) { layoutinflater inflater = layoutinflater.from(this); final view textentryview = inflater.inflate( r.layout.dialoglayout, null); final edittext edtinput=(edittext)textentryview.findviewbyid(r.id.edtinput); final alertdialog.builder builder = new alertdialog.builder(context); builder.setcancelable(false); builder.seticon(r.drawable.icon); builder.settitle("title"); builder.setview(textentryview); builder.setpositivebutton("确认", new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int whichbutton) { settitle(edtinput.gettext()); } }); builder.setnegativebutton("取消", new dialoginterface.onclicklistener() { public void onclick(dialoginterface dialog, int whichbutton) { settitle(""); } }); builder.show(); }} |
