AlertDialog选择对话框

转载请注明出处：http://blog.csdn.net/mr_leixiansheng/article/details/53559605

区别：不用在xml定义，直接在活动中使用

package com.example.administrator.alertdialog;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        //实例化一个 AlertDialog.Builder
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        //设置标题、内容、返回键是否退出、按键响应
        builder.setTitle("对话选择框");
        builder.setMessage("这是一个对话框，请进行选择");
        builder.setCancelable(false);

        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(MainActivity.this, "你点击了OK", Toast.LENGTH_SHORT).show();
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                finish();
            }
        });
        //必须显示出来
        builder.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">

</LinearLayout>