<?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="顯示普通對話框"   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) {    // 顯示對話框    showDialog(DIALOG);   }  }); } /**  * 創建普通對話框  */ @Override protected Dialog onCreateDialog(int id) {  Dialog dialog=null;  switch (id) {  case DIALOG:   Builder builder=new android.app.AlertDialog.Builder(this);   //設置對話框的圖標   builder.setIcon(R.drawable.header);   //設置對話框的標題   builder.setTitle("普通對話框");   //設置對話框的顯示內容   builder.setMessage("這是普通對話框中的內容！！");   //添加按鈕，android.content.DialogInterface.OnClickListener.OnClickListener   builder.setPositiveButton(" 確 定 ", new OnClickListener(){    public void onClick(DialogInterface dialog, int which) {     editText.setText("這是普通對話框中的內容！！");    }   });   //創建一個普通對話框   dialog=builder.create();   break;  }  return dialog; }}