Android 使用图层列表作为按钮选择器 [英] Android Using layer-list for button selector
问题描述
我们如何使用图层列表作为按钮的可绘制对象.我有一个按钮:
How do we use a layer-list as a drawable for a button. I have a button:
<item android:state_pressed="true">
<shape>
<gradient android:endColor="@color/white"
android:startColor="@color/grey_blue_light" android:angle="90" />
<stroke android:width="1dp" android:color="@color/aqua_blue" />
<corners android:radius="3dp" />
<padding android:left="10dp" android:top="10dp"
android:right="10dp" android:bottom="10dp" />
</shape>
</item>
<item android:state_focused="true">
</item>
<item>
</item>
现在我需要一个图层列表作为按下按钮状态时的形状:
Now I need a layer-list to be used as a shape when say button state is pressed:
<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="oval">
<solid android:color="@color/aqua_blue" />
</shape>
</item>
<item android:top="1dp" android:left="1dp" android:right="1dp" android:bottom="1dp">
<shape android:shape="oval">
<solid android:color="@color/aqua_blue" />
</shape>
</item>
我们如何在按钮选择器中使用这个图层列表?
How do we use this layer list in the button selector?
推荐答案
Step-1在 drawable 文件夹下为按钮的三种不同状态创建三个不同的 layer_list xml.例如那些 xml 的名称是 layer1.xml, layer2.xml, layer3.xml
Step-1
create three different layer_list xml under drawable folder for three different state of button. example the name of those xml is layer1.xml, layer2.xml, layer3.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android"
>
<item>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"
>
<gradient
android:angle="270"
android:startColor="#0000ff"
android:endColor="#0000dd"
android:type="linear"
/>
</shape>
</item>
</layer-list>
第 2 步创建一个名为 btn_background.xml 的选择器 xml 并在 drawable 属性中传递 layer_list xml
Step-2 create a selector xml named as btn_background.xml and pass the layer_list xml in drawable attribute
<selector
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/layer1">
</item>
<item android:state_focused="true" android:drawable="@drawable/layer2">
</item>
<item android:drawable="@drawable/layer3">
</item>
</selector>
第 3 步将选择器 xml 设置为按钮的背景 android:background="@drawable/btn_background"
step-3
Set the selector xml as background of the button android:background="@drawable/btn_background"
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