package com.loaderman.popupwindowdemo;import android.app.Activity;import android.graphics.Color;import android.graphics.drawable.ColorDrawable;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.PopupWindow;public class MainActivity extends Activity {    private Button btnPop;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btnPop = (Button) findViewById(R.id.btn_Pop);    }    public void showPopupWindow(View v) {        View view = View.inflate(this, R.layout.layout_pop, null);        PopupWindow popup = new PopupWindow(view, v.getWidth(), 150, true);//设置尺寸及获取焦点        //必须设置背景色,不然不会消失        popup.setBackgroundDrawable(new ColorDrawable(Color.GRAY));//设置背景颜色        // 设置进入退出动画        popup.setAnimationStyle(R.style.PopAnimation);        // 显示在某个控件的正下方        popup.showAsDropDown(btnPop, 0, 0);        //显示在屏幕的位置        // popup.showAtLocation(rlRoot, Gravity.LEFT + Gravity.TOP, 0,0);    }}

 activity_main.xml

layout_pop.xml

在values/style中:

在res/anim文件下创建进入退出动画

pop_enter.xml

 pop_exit.xml

 效果图: