看到android5.0版本中提供了 elevation 的功能，我在SDK Manager 下载了 Android 5.0 例子代码，看了下 ElevationBasic 例子，展示了2个view对象，一个圆形一个矩形，圆形设置了 android:elevation = 30dp，具体例子如下
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<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<!--
Copyright 2014 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-
-->
<
FrameLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"
xmlns:tools
=
"http://schemas.android.com/tools"
android:layout_width
=
"match_parent"
android:layout_height
=
"match_parent"
>
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