对话框

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <Button 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:id="@+id/btn1"
        android:text="点击显示"
        />

</LinearLayout>

package com.example.deemo;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initEvent();
    }
    private void initEvent(){//点击事件
        findViewById(R.id.btn1).setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                showDialog1();
                
            }
        });
        
    }
    private void showDialog1(){//显示确认对话框
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("确认dialog");
        builder.setIcon(R.drawable.ic_launcher);//图标
        builder.setMessage("提示内容");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {//确定按钮

            @Override
            public void onClick(DialogInterface dialog, int arg1) {
                Toast.makeText(MainActivity.this, "点击确定", Toast.LENGTH_SHORT).show();
                
            }
            });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {//取消按钮
            
            @Override
            public void onClick(DialogInterface arg0, int arg1) {
                Toast.makeText(MainActivity.this, "点击取消", Toast.LENGTH_SHORT).show();
                
            }
        });
        
        AlertDialog dialog = builder.create();//获取dialog
        dialog.show();//显示dialog
    }
}