删除对话框练习

一.写出实现如图所示的对话框的代码。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.wang.xuexi.TestActivity1"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="删除"
        android:onClick="bt1_OnClick"/>
</LinearLayout>

package com.example.wang.xuexi;

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

public class TestActivity1 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test1);

    }

    public  void bt1_OnClick(View v)
    {

        AlertDialog alertDialog=new AlertDialog.Builder(this)
                .setTitle("提示")
                .setMessage("确定要删除吗？"+"
"+
                        "要删除，请点击“是”。")
                .setPositiveButton("是", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        Toast.makeText(TestActivity1.this, "已删除，which" + which, Toast.LENGTH_SHORT).show();

                    }
                })
                .setNegativeButton("否", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        Toast.makeText(TestActivity1.this, "未删除，which" + which, Toast.LENGTH_SHORT).show();

                    }
                })
                .show();
    }
}