Android开发，带单选按钮和多选按钮的对话框

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package com.example.administrator.sharedpreferences;import android.content.DialogInterface.OnMultiChoiceClickListener;import android.content.DialogInterface;import android.os.Bundle;import android.support.v7.app.AlertDialog;import android.support.v7.app.AlertDialog.Builder;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private Button button;    private Button SingButton;    private String[] items;    private boolean[] checkedItems;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.button);        SingButton= (Button) findViewById(R.id.SingButton);        SingButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                final String[] items = new String[]{"标准","无声","会议","户外","离线"};                Builder builder = new AlertDialog.Builder(MainActivity.this);                builder.setIcon(R.mipmap.ic_launcher);                builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        Toast.makeText(MainActivity.this,"你选择了"+items[which],Toast.LENGTH_SHORT).show();                    }                });                builder.create().show();            }        });        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                items = new String[]{"植物大战僵尸","生物鱼大战","宠物大战","玛丽大战","坦克大战"};                checkedItems = new boolean[]{true,false,false,false,false};                Builder builder = new AlertDialog.Builder(MainActivity.this);                builder.setIcon(R.mipmap.ic_launcher);                builder.setTitle("确定？");                builder.setMultiChoiceItems(items ,checkedItems, new OnMultiChoiceClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {                        checkedItems[which] = isChecked;                    }                });                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        String result = "";                        for(int i=0;i<checkedItems.length;i++)                        {                            if(checkedItems[i]){                                result+=items[i]+"、";                            }                        }                        if (!"".equals(result)){                            result = result.substring(0,result.length()-1);                            Toast.makeText(MainActivity.this,"您选择了"+result,Toast.LENGTH_SHORT).show();                        }                    }                });                builder.create().show();            }        });    }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:id="@+id/SingButton"        android:text="带单选按钮的对话框"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <Button        android:id="@+id/button"        android:text="带多项选择的对话框"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

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