PopUpWindow显示在某个View之上，同时使用动画

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最近在写类似于美团的底部弹出购物车使用popupWindow来实现。

先讲解动画：在res/下新建一个文件夹anim,进而anim下新建两个xml文件，如图所示：

其中，pophidden_anim的代码如下

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">     <translate    android:duration="1000"    android:fromYDelta="0"    android:toYDelta="50%p" />  <alpha    android:duration="1000"    android:fromAlpha="1.0"    android:toAlpha="0.0" /></set>

popshow_anim的代码如下

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">   <translate    android:duration="1000"    android:fromYDelta="100%p"    android:toYDelta="0" />  <alpha    android:duration="1000"    android:fromAlpha="0.0"    android:toAlpha="1.0" /></set>

然后在values/styles.xml加入以下代码，变成这个样子，上面的那些是自带的

<resources>  <!--    Base application theme, dependent on API level. This theme is replaced    by AppBaseTheme from res/values-vXX/styles.xml on newer devices.  -->  <style name="AppBaseTheme" parent="android:Theme.Light">    <!--      Theme customizations available in newer API levels can go in      res/values-vXX/styles.xml, while customizations related to      backward-compatibility can go here.    -->  </style>  <!-- Application theme. -->  <style name="AppTheme" parent="AppBaseTheme">    <!-- All customizations that are NOT specific to a particular API-level can go here. -->  </style>   <!--  这个是加入的代码 -->  <style name="mypopwindow_anim_style">    <item name="android:windowEnterAnimation">@anim/popshow_anim</item> <!-- 指定显示的动画xml -->    <item name="android:windowExitAnimation">@anim/pophidden_anim</item> <!-- 指定消失的动画xml -->  </style></resources>

代码中popupWindow使用：

popupWindow.setAnimationStyle(R.style.vegetable_pop);加载

刚开始在自定义View中要获取popUpWindow的高度一直不成功，最后修改如下

public class VegetableCarsWindow {    private LayoutInflater inflater;    private Activity context;    private PopupWindow popupWindow;    private View contentView;  //显示的视图    public VegetableCarsWindow(Activity context){        this.context=context;        inflater=context.getLayoutInflater();        contentView=inflater.inflate(R.layout.vegetable_popwindow, null);        initView();    }    public void initView(){        popupWindow=new PopupWindow(contentView, ActionBar.LayoutParams.MATCH_PARENT, ActionBar.LayoutParams.WRAP_CONTENT);        popupWindow.setFocusable(true);        popupWindow.setOutsideTouchable(true);        popupWindow.setBackgroundDrawable(new BitmapDrawable());        popupWindow.setAnimationStyle(R.style.vegetable_pop);        popupWindow.setFocusable(true);        contentView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);    }    public void setShow(View view){        int[] location = new int[2];        view.getLocationOnScreen(location);        popupWindow.showAtLocation(view, Gravity.TOP, 0, location[1]-contentView.getMeasuredHeight());  //显示    }}
红色部分是关键

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