styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="custom_dialog2" parent="@android:style/Theme.Dialog">
        <item name="android:windowFrame">@null</item>
        <!-- Dialog的windowFrame框为无 -->
        <item name="android:windowIsFloating">true</item>
        <!-- 是否漂现在activity上 -->
        <item name="android:windowIsTranslucent">true</item>
        <!-- 是否半透明 -->
        <item name="android:windowNoTitle">true</item>
        <item name="android:background">@null</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowContentOverlay">@null</item>
        <!-- 去除黑色边框的关键设置项 -->
        <item name="android:backgroundDimEnabled">true</item>
        <!-- 屏幕背景是否变暗 -->
        <item name="android:backgroundDimAmount">0.3</item>
    </style>

    <style name="picker_view_scale_anim" mce_bogus="1" parent="android:Animation">
        <item name="android:windowEnterAnimation">@anim/pickerview_dialog_scale_in</item>
        <item name="android:windowExitAnimation">@anim/pickerview_dialog_scale_out</item>
    </style>


    <style name="picker_view_slide_anim" mce_bogus="1" parent="android:Animation">
        <item name="android:windowEnterAnimation">@anim/pickerview_slide_in_bottom</item>
        <item name="android:windowExitAnimation">@anim/pickerview_slide_out_bottom</item>
    </style>

</resources>