Android Alertdialog（实现警告对话框）

<?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:text="卸载"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onClick="show"
    android:id="@+id/button" />
</LinearLayout>

import android.content.DialogInterface;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;
/**
 * Created by panchengjia on 2016/11/21.
 */
public class AlertDialogDemo extends AppCompatActivity {
  @Override
  protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.alterdialog);
  }
  public void show(View v){
    //实例化建造者
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    //设置警告对话框的标题
    builder.setTitle("卸载");
    //设置警告显示的图片
//    builder.setIcon(android.R.drawable.ic_dialog_alert);
    //设置警告对话框的提示信息
    builder.setMessage("确定卸载吗");
    //设置”正面”按钮，及点击事件
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(AlertDialogDemo.this,"点击了确定按钮",Toast.LENGTH_SHORT).show();
      }
    });
    //设置“反面”按钮，及点击事件
    builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(AlertDialogDemo.this,"点击了取消按钮",Toast.LENGTH_SHORT).show();
      }
    });
    //设置“中立”按钮，及点击事件
    builder.setNeutralButton("等等看吧", new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(AlertDialogDemo.this,"点击了中立按钮",Toast.LENGTH_SHORT).show();
      }
    });
    //显示对话框
    builder.show();
  }
}