简述

本文仅供参考，主要用于进出场动画讲解，如有不足之处，希望大家理解

Layout-->xml

//设置布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="123"
        android:id="@+id/ll"
        />
</LinearLayout>

anim-->xml

// 进场
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:duration="2000">
    <alpha android:fromAlpha="1" android:toAlpha="0"/>
    <translate android:fromXDelta="100%p"
        android:fromYDelta="100%p"
        android:toXDelta="0"
        android:toYDelta="0"
        />
</set>

//离场
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:duration="2000">
    <alpha android:fromAlpha="0" android:toAlpha="1"/>
    <translate android:fromXDelta="0"
        android:fromYDelta="0"
        android:toXDelta="100%p"
        android:toYDelta="100%p"
        />
</set>

values-->styes

 <style name="Popupwindow" parent="android:style/Animation">
        <item name="android:windowEnterAnimation">@anim/set_enter</item>
        <item name="android:windowExitAnimation">@anim/set_exit</item>
    </style>

Activity中

//创建PopupWindow 
View view = LayoutInflater.from(PagerThreeActivity.this).inflate(R.layout.popu, null);
                final PopupWindow popupWindow = new PopupWindow(view, 
                        GridView.MarginLayoutParams.MATCH_PARENT, GridView.MarginLayoutParams.MATCH_PARENT);
                popupWindow.setAnimationStyle(R.style.Popupwindow);
                popupWindow.showAsDropDown(view, 0, 0);
                popupWindow.setClippingEnabled(true);
                Myy(0.5f);

//设置监听
//点击button 离场
   view.findViewById(R.id.ll).setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        popupWindow.dismiss();
                        Myy(1);
                    }
                });
//点击阴影离场
                view.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        popupWindow.dismiss();
                        Myy(1);
                    }
                });

 //阴影
    public void Myy(float b) {
        WindowManager.LayoutParams attributes = getWindow().getAttributes();
        attributes.alpha = b;
        getWindow().setAttributes(attributes);
    }