android selector-优快云博客

本文详细介绍了如何在Android中为按钮创建多种状态切换的自定义设计，包括聚焦、按下、选中、失焦和启用状态，通过背景配置和字体颜色配置实现渐变色效果。

在res/drawable文件夹新增一个文件，此文件设置了图片的触发状态，你可以设置 state_pressed，state_checked，state_pressed，state_selected，state_focused，state_enabled 等几个状态：

背景配置文件：

button_bg.xml 
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true"
       android:state_pressed="true"
       android:drawable="@drawable/button_focused" />
    <item android:state_focused="false" 

       android:state_pressed="true"
       android:drawable="@drawable/button_defocused" />
    <item android:state_focused="true"
       android:drawable="@drawable/button_focused" />
    <item android:state_focused="false"
       android:drawable="@drawable/button_defocused" />
</selector>

button_focused.xml //实现渐变色的效果

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#505050" android:endColor="#C0C0C0"
       android:paddingTop="5dp" android:angle="0" />
    <corners android:radius="5dp" />
    <stroke android:width="2dp" android:color="#FFFF9200" />
</shape>
button_defocused.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#505050" android:endColor="#C0C0C0"
       android:paddingTop="5dp" android:angle="0" />
    <corners android:radius="5dp" />
</shape>

字体颜色配置文件：

button_font.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:color="#FFF" />
    <item android:state_focused="true" android:color="#FFF" />
    <item android:state_pressed="true" android:color="#FFF" />
    <item android:color="#000" />
</selector>