android 72 确定取消对话框，单选对话框，多选对话框

package com.itheima.dialog;

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

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    //确定取消对话框
    public void click1(View v){
        AlertDialog.Builder builder = new Builder(this);
        //设置图标
        builder.setIcon(android.R.drawable.alert_dark_frame);
        //设置标题
        builder.setTitle("欲练此功必先自宫");
        //设置文本
        builder.setMessage("李志平，想清楚哦");
        //设置确定按钮
        builder.setPositiveButton("确定", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "感谢使用本软件,再见", 0).show();
            }
        });
        //设置取消按钮
        builder.setNegativeButton("取消", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "若不自宫,一定不成功", 0).show();
            }
        });
        //使用创建器,生成一个对话框对象
        AlertDialog ad = builder.create();
        ad.show();
    }

    //单选对话框
    public void click2(View v){
        AlertDialog.Builder builder = new Builder(this);
        builder.setTitle("请选择性别");
        final String[] items = new String[]{//局部变量在内部类使用要final
                "男",
                "女"
        };
        builder.setSingleChoiceItems(items, -1, new OnClickListener() {//-1默认被选择的
            //which:用户所选的条目的下标
            //dialog:触发这个方法的对话框
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "您选择的是:" + items[which], 0).show();
                //关闭对话框
                dialog.dismiss();
            }
        });
        builder.show();
    }

    //多选对话框
    public void click3(View v){
        AlertDialog.Builder builder = new Builder(this);
        builder.setTitle("请选择您觉得帅的人");
        final String[] items = new String[]{//多选条目
                "侃哥",
                "赵帅哥",
                "赵老师",
                "赵师兄"
        };
        final boolean[] checkedItems = new boolean[]{//checkedItems默认哪些是被选中的，
                true,
                true,
                false,
                false
        };
        builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {
            //which:用户点击的条目的下标
            //isChecked:用户是选中该条目还是取消该条目
            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                checkedItems[which] = isChecked;
            }
        });
        //设置一个确定按钮
        builder.setPositiveButton("确定", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                String text = "";
                for(int i = 0; i < 4; i++){
                    text += checkedItems[i]? items[i] + "," : "";
                }
                Toast.makeText(MainActivity.this, text, 0).show();
                dialog.dismiss();
            }
        });
        builder.show();
    }
}