android 弹框删除

package com.example.xinlin4;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    Button button2= (Button) findViewById(R.id.button2);
    
    button2.setOnClickListener(new OnClickListener() {
		
		@Override
		public void onClick(View v) {

// 通过AlertDialog.Builder这个类来实例化我们的一个AlertDialog的对象
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
// 设置Title的图标
builder.setIcon(R.drawable.ic_launcher);
// 设置Title的内容
builder.setTitle(“弹出警告框”);
// 设置Content来显示一个信息
builder.setMessage(“确定删除吗？”);
// 设置一个PositiveButton
builder.setPositiveButton(“确定”, new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
Toast.makeText(MainActivity.this, "positive: " + which, Toast.LENGTH_SHORT).show();
}
});
// 设置一个NegativeButton
builder.setNegativeButton(“取消”, new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
Toast.makeText(MainActivity.this, "negative: " + which, Toast.LENGTH_SHORT).show();
}
});
// 设置一个NeutralButton
builder.setNeutralButton(“忽略”, new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
Toast.makeText(MainActivity.this, "neutral: " + which, Toast.LENGTH_SHORT).show();
}
});
// 显示出该对话框
builder.show();
}
});

}

}