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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