android 弹出窗口

1. xml 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
    Android:orientation="vertical"
    Android:layout_width="fill_parent"
    Android:layout_height="fill_parent"
    >
<Button Android:id="@+id/alert"
        Android:layout_width="fill_parent"
        Android:layout_height="wrap_content"
        Android:text="Make an alert"></Button>
<Button    Android:id="@+id/toast"
        Android:layout_width="fill_parent"
        Android:layout_height="wrap_content"
        Android:text="Make a toast"></Button>
</LinearLayout>

2. 源文件

 package a06.test;

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

public class a06 extends Activity {
    //定义变量
    private Button alert = null;
    private Button toast = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        System.out.println("郑文亮");
        //根据Id得到控件对象
        alert = (Button)findViewById(R.id.alert);
        toast = (Button)findViewById(R.id.toast);
      
        //给按钮设定单击事件监听器
        alert.setOnClickListener(new View.OnClickListener() {
          
            @Override
            public void onClick(View v) {
                //显示AlertDialog
                new AlertDialog.Builder(a06.this).setTitle("弹出例子").setMessage("您的信息").setNeutralButton("close01", new DialogInterface.OnClickListener() {
                  
                    //点击AlertDialog上的按钮的事件处理代码
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        System.out.println("郑文亮");
                      
                    }
                }).show();
              
            }
        });
        toast.setOnClickListener(new View.OnClickListener() {
          
            //显示Toast
            @Override
            public void onClick(View v) {
          
                Toast.makeText(a06.this, "<看到我了吗？一会我就消失了>", Toast.LENGTH_SHORT).show();
              
            }
        });
    }
}