Android普通对话框用法实例分析

<?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">
 <edittext android:text="" 
  android:id="@+id/edittext"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  android:editable="false"
  android:cursorvisible="false" />
 <button android:text="显示普通对话框" 
  android:id="@+id/button"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" />
</linearlayout>

package com.ljq.dialog;
import android.app.activity;
import android.app.dialog;
import android.app.alertdialog.builder;
import android.content.dialoginterface;
import android.content.dialoginterface.onclicklistener;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.edittext;
public class alertdialog extends activity {
 private edittext edittext;
 private final static int dialog=1;
 @override
 public void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.main);
  edittext=(edittext)findviewbyid(r.id.edittext);
  button button = (button) findviewbyid(r.id.button);
  button.setonclicklistener(new view.onclicklistener() {
   public void onclick(view v) {
    // 显示对话框
    showdialog(dialog);
   }
  });
 }
 /**
  * 创建普通对话框
  */
 @override
 protected dialog oncreatedialog(int id) {
  dialog dialog=null;
  switch (id) {
  case dialog:
   builder builder=new android.app.alertdialog.builder(this);
   //设置对话框的图标
   builder.seticon(r.drawable.header);
   //设置对话框的标题
   builder.settitle("普通对话框");
   //设置对话框的显示内容
   builder.setmessage("这是普通对话框中的内容！！");
   //添加按钮，android.content.dialoginterface.onclicklistener.onclicklistener
   builder.setpositivebutton(" 确 定 ", new onclicklistener(){
    public void onclick(dialoginterface dialog, int which) {
     edittext.settext("这是普通对话框中的内容！！");
    }
   });
   //创建一个普通对话框
   dialog=builder.create();
   break;
  }
  return dialog;
 }
}