package com.qianfeng.singledialog;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.view.Menu;import android.widget.Toast;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //拿到一个AlertDialog.Builder对象        AlertDialog.Builder builder = new Builder(this);        //设置对话框标题        builder.setTitle("单选对话框");        final String[] items = new String[]{            "男","女"            };        //第一个参数就是内容items,第二个-1是表示不默认选中,第三个就是一个监听机制        builder.setSingleChoiceItems(items, -1, new OnClickListener() {                        @Override            public void onClick(DialogInterface dialog, int which) {            //用吐司对话框显示你选的内容            Toast.makeText(MainActivity.this, "你选择的是"+items[which], 0).show();                //选中之后对话框应该消失            dialog.dismiss();            }        });        //把对话框show一下        builder.show();    }}