创建最简单的Dialog

package com.ipjmc.dialog;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.os.Bundle;public class SimpleDialogActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        //创建并显示Dialog示例        Dialog dialog = new AlertDialog.Builder(SimpleDialogActivity.this)        .setTitle("提示").setMessage("确实要退出程序?") //设置标题        .setPositiveButton("确定", new DialogInterface.OnClickListener() { //添加按钮        //确定按钮的点击事件            @Override            public void onClick(DialogInterface dialog, int which) {            SimpleDialogActivity.this.finish();            }        }).setNegativeButton("取消", new DialogInterface.OnClickListener() { //添加按钮//取消按钮的点击事件            @Override            public void onClick(DialogInterface dialog, int which) {                dialog.dismiss();            }        }).create();        dialog.show(); //显示dialog    }}