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>
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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>
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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();
}
}
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