下载源码

先看效果：

下面是java代码：

package com.example.cest;import android.app.Activity;
import android.graphics.drawable.PaintDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {PopupWindow popupWindow;TextView view1;TextView view2;Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button=(Button) findViewById(R.id.bu);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubpopinit();}});}protected void popinit() {// TODO Auto-generated method stubLayoutInflater inflater = LayoutInflater.from(this);View pop_view = inflater.inflate(R.layout.bujv, null);view1=(TextView) pop_view.findViewById(R.id.tv1);view2=(TextView) pop_view.findViewById(R.id.tv2);//设置下拉按钮父布局的高和宽popupWindow = new PopupWindow(pop_view,ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);popupWindow.setFocusable(true);//没这行按钮下拉了，按手机返回会直接退出
//      popupWindow.setOutsideTouchable(true);popupWindow.setBackgroundDrawable(new PaintDrawable());//没这行按钮下拉了不会消失popupWindow.showAsDropDown(button);//设置下拉按钮在button下显示view1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubToast.makeText(MainActivity.this, "这是注册",Toast.LENGTH_LONG).show();popupWindow.dismiss(); //销毁popupwindow，没这个再返回下拉的按钮不会消失  }});view2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubToast.makeText(MainActivity.this, "这是登录",Toast.LENGTH_LONG).show();popupWindow.dismiss(); }});}}

下面是bujv.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical" ><TextView android:id="@+id/tv1"android:layout_height="wrap_content"android:layout_width="wrap_content"android:background="@drawable/btn_style_one_disabled"android:textSize="20sp"android:text="注册"/><TextView android:id="@+id/tv2"android:layout_height="wrap_content"android:layout_width="wrap_content"android:background="@drawable/btn_style_one_disabled"android:textSize="20sp"android:text="登录"/>
</LinearLayout>