Android 高程未在按钮上显示阴影 [英] Android elevation not showing shadow on Button
问题描述
无法显示按钮阴影.
将我的代码精简为最小示例:
activity_main.xml
<ScrollView 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"><线性布局android:id="@+id/main_layout";android:layout_width="wrap_content";android:layout_height=wrap_content"><相对布局android:layout_width=match_parent"android:layout_height=match_parent"android:layout_marginTop=10dp"android:layout_marginLeft=10dp"><按钮android:id="@+id/my_button";android:layout_width="wrap_content";android:layout_height="wrap_content";android:layout_centerHorizontal="true"android:layout_marginLeft=20dp"机器人:海拔=10dp";android:translationZ=10dp"android:background=@android:color/holo_green_light"机器人:文本=按钮"/></RelativeLayout></LinearLayout></ScrollView>
我需要那种布局结构.
MainActivity.java
公共类 MainActivity 扩展 AppCompatActivity {@覆盖protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}}
阴影在 Android Studio 设计器中可见:
但在运行时不显示:
测试:
- Genymotion Google Nexus 5X - Marshmallow 6.0.0 - API 23
- Genymotion Google Nexus 5 - Lollipop 5.1.0 - API 22
- Genymotion 三星 Galaxy S2 - 果冻豆 4.1.1 - API 16
- 硬件设备,三星 Galaxy S5 mini - KitKat 4.4.2 - API 19
结果都一样.
我正在使用:
- Android Studio 2.1.2
- minSdk 版本 16
- targetSdkVersion 24
请在 Andriod Studio 中创建一个新项目,Empty Activity 模板,然后将该代码复制并粘贴到 activity_main.xml
和 MainActivity.java
中,以便您进行测试和判断我.
Material
下的默认Button
样式有一个StateListAnimator
控制android:elevation
和android:translationZ
属性.
Can't get button shadows to show up.
Stripped down my code to the minimal example:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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">
<LinearLayout
android:id="@+id/main_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp">
<Button
android:id="@+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginLeft="20dp"
android:elevation="10dp"
android:translationZ="10dp"
android:background="@android:color/holo_green_light"
android:text="BUTTON"/>
</RelativeLayout>
</LinearLayout>
</ScrollView>
I need that layout structure.
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
Shadows is visible in Android Studio designer:
But not shown at runtime:
Tested on:
- Genymotion Google Nexus 5X - Marshmallow 6.0.0 - API 23
- Genymotion Google Nexus 5 - Lollipop 5.1.0 - API 22
- Genymotion Samsung Galaxy S2 - Jelly Bean 4.1.1 - API 16
- Hardware device, Samsung Galaxy S5 mini - KitKat 4.4.2 - API 19
All same result.
I'm using:
- Android Studio 2.1.2
- minSdkVersion 16
- targetSdkVersion 24
Please create a new project in Andriod Studio, Empty Activity template, then copy and paste that code into activity_main.xml
and MainActivity.java
so you can test and tell me.
The default
Button
style underMaterial
has aStateListAnimator
that controls theandroid:elevation
andandroid:translationZ
properties.
just add this property to your Button
. you can set your own using the android:stateListAnimator
property.
android:stateListAnimator="@null"
full code :
<Button
android:id="@+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginLeft="20dp"
android:elevation="2dp"
android:translationZ="2dp"
android:stateListAnimator="@null"
android:background="@android:color/holo_green_light"
android:text="BUTTON">
UpDate :
for Understanding I set it 10dp..
xml code :
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp">
<Button
android:id="@+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginLeft="20dp"
android:elevation="10dp"
android:translationZ="10dp"
android:stateListAnimator="@null"
android:background="@android:color/holo_green_light"
android:text="BUTTON"/>
</RelativeLayout>
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