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
    }
}