如何在android中的drawable上添加阴影效果
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/26356060/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
how to add shadow effect on drawable in android
提问by maddy d
I have created chat bubble with drawable which looks fine, now I want to add shadow effect below the drawable so it make 3d effect.I don't want to use 9-pitch image. I just want to know how i can add shadow effect on this drawable. my code is
我创建了带有 drawable 的聊天气泡，看起来不错，现在我想在 drawable 下方添加阴影效果，这样它就会产生 3d 效果。我不想使用 9 间距图像。我只想知道如何在这个 drawable 上添加阴影效果。我的代码是
----right_bubble_chat_drawable
----right_bubble_chat_drawable
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="15dp" />
<solid android:color="@color/chatrightbubbleColor" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<size
android:height="@dimen/normal_button_height"
android:width="@dimen/normal_button_width" />
--- for corner pointer 'chat_laftarraow'
--- 角指针 'chat_laftarraow'
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item >
<rotate
android:fromDegrees="90"
android:toDegrees="-90"
android:pivotX="50%"
android:pivotY="50%" >
<rotate
android:fromDegrees="45"
android:toDegrees="45"
android:pivotX="-40%"
android:pivotY="86%" >
<shape
android:shape="rectangle" >
<stroke android:color="#00aaef" android:width="1dp"/>
<solid
android:color="#00aaef" />
</shape>
</rotate>
</rotate>
</item>
</layer-list>
------- I am using them like
-------我正在使用它们
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<View
android:id="@+id/left_chatArror"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_marginTop="6dp"
android:background="@drawable/chat_laftarraow"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="220dp"
android:layout_marginRight="-3dp"
android:orientation="horizontal"
android:layout_toLeftOf="@+id/left_chatArror"
android:paddingBottom="5dp"
android:paddingTop="5dp"
android:background="@drawable/right_bubble_chat_drawable">
</RelativeLayout>
</RelativeLayout>
Please suggest me how can I add shadow effect below the bubble as in the image below
请建议我如何在气泡下方添加阴影效果，如下图所示
回答by Himanshu Agarwal
You can try by implementing a layer-list that will act as the background for the LinearLayout and add your viewinside this.
您可以尝试通过实现一个图层列表作为 LinearLayout 的背景并将您的添加view到其中。
Quote from an answer to this question:
引自对这个问题的回答：
Add background_with_shadow.xml file to
res/drawable. Containing:<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <item > <shape android:shape="rectangle"> <solid android:color="@android:color/darker_gray" /> <corners android:radius="5dp"/> </shape> </item> <item android:right="1dp" android:left="1dp" android:bottom="2dp"> <shape android:shape="rectangle"> <solid android:color="@android:color/white"/> <corners android:radius="5dp"/> </shape> </item> </layer-list>Then add the the layer-list as background in your LinearLayout.
<LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/background_with_shadow"/>
将 background_with_shadow.xml 文件添加到
res/drawable. 包含：<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <item > <shape android:shape="rectangle"> <solid android:color="@android:color/darker_gray" /> <corners android:radius="5dp"/> </shape> </item> <item android:right="1dp" android:left="1dp" android:bottom="2dp"> <shape android:shape="rectangle"> <solid android:color="@android:color/white"/> <corners android:radius="5dp"/> </shape> </item> </layer-list>然后在 LinearLayout 中添加图层列表作为背景。
<LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/background_with_shadow"/>
EDIT
编辑
You can create seprate xml for creating gray image like thsis:
您可以创建单独的 xml 来创建灰色图像，如下所示：
----right_bubble_shdw_chat_drawable
----right_bubble_shdw_chat_drawable
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="15dp" />
<solid android:color="@android:color/darker_gray" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<size
android:height="@dimen/normal_button_height"
android:width="@dimen/normal_button_width" />
--- for corner pointer 'chat_laftarraow_shdw'
--- 角指针'chat_laftarraow_shdw'
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item >
<rotate
android:fromDegrees="90"
android:toDegrees="-90"
android:pivotX="50%"
android:pivotY="50%" >
<rotate
android:fromDegrees="45"
android:toDegrees="45"
android:pivotX="-40%"
android:pivotY="86%" >
<shape
android:shape="rectangle" >
<stroke android:color="@android:color/darker_gray" android:width="1dp"/>
<solid
android:color="@android:color/darker_gray" />
</shape>
</rotate>
</rotate>
</item>
</layer-list>
------- I am using them like
-------我正在使用它们
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<View
android:id="@+id/left_chatArror"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_marginTop="6dp"
android:background="@drawable/chat_laftarraow"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="220dp"
android:layout_marginRight="-3dp"
android:orientation="horizontal"
android:layout_toLeftOf="@+id/left_chatArror"
android:paddingBottom="5dp"
android:paddingTop="5dp"
android:background="@drawable/right_bubble_chat_drawable">
</RelativeLayout>
<View
android:id="@+id/left_chatArrorShdw"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_marginTop="15dp"
android:background="@drawable/chat_laftarraow_shdw"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="220dp"
android:layout_marginRight="-3dp"
android:orientation="horizontal"
android:layout_toLeftOf="@+id/left_chatArror"
android:paddingBottom="5dp"
android:paddingTop="5dp"
android:background="@drawable/right_bubble_shdw_chat_drawable">
</RelativeLayout>
回答by Nidhi Savaliya
I am using this drawable/shadow.xml file
我正在使用这个 drawable/shadow.xml 文件
<!-- Drop Shadow Stack -->
<item>
<shape>
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#00CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape>
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#10CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape>
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#20CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<!-- Background -->
<item>
<shape>
<solid android:color="@android:color/white" />
<corners android:radius="3dp" />
</shape>
</item>
Note :-Root layout should be layer-list. Inside it add items.
注意：-根布局应该是层列表。在里面添加项目。
