<activity
　　android:name=".product.MyselfPayProduct"
  android:screenOrientation="portrait"
  android:theme="@android:style/Theme.Dialog" >

//窗口对齐屏幕宽度
Window win = this.getWindow();
win.getDecorView().setPadding(0, 0, 0, 0);
WindowManager.LayoutParams lp = win.getAttributes();
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
lp.gravity = Gravity.TOP;//设置对话框置顶显示
win.setAttributes(lp);

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
  <scale
    android:fromXScale="1.0"
android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:toXScale="1.0" 
    android:fromYScale="0.0"
    android:toYScale="1.0"
    android:duration="200"
    android:pivotX="0"
    android:pivotY="10%"
    />
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
  <scale
    android:fromXScale="1.0"
android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:toXScale="1.0" 
    android:fromYScale="1.0"
    android:toYScale="0.0"
    android:duration="200"
    android:pivotX="0"
    android:pivotY="10%"
    />
</set>

<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>
  <!-- 没有标题 -->
  <style name="notitle" parent="AppBaseTheme">
     <item name="android:windowNoTitle">true</item>
  </style>
  <!-- 类似对话框效果 -->
  <style name="MyDialogTopRight"> 
    <item name="android:windowBackground">@android:color/transparent</item> 
    <item name="android:windowIsTranslucent">true</item> 
    <item name="android:windowNoTitle">true</item> 
    <item name="android:windowAnimationStyle">@style/Anim_scale</item> 
  </style> 
   <style name="Anim_scale" parent="@android:style/Animation.Activity">
    <item name="android:activityOpenEnterAnimation">@anim/scale_in</item>
    <item name="android:activityOpenExitAnimation">@anim/scale_out</item>
    <item name="android:activityCloseEnterAnimation">@anim/scale_in</item>
    <item name="android:activityCloseExitAnimation">@anim/scale_out</item>
  </style>
</resources>