Android开发 StateListDrawable（selector）详解

休闲老徐 發表於 2019-7-25 14:08:00

Android开发 StateListDrawable（selector）详解

<h1>前言</h1>
　　StateListDrawable是与xml中的selector属性对应代码实现类,它需要配合GradientDrawable的使用,如果你还不了解GradientDrawable可以参考我的另一篇博客:https://www.cnblogs.com/guanxinjing/p/11142599.html
<h1>属性</h1>
 
<div class="cnblogs_code">
<pre>
<attr name="state_focused" format="boolean" />


<attr name="state_window_focused" format="boolean" />


<attr name="state_enabled" format="boolean" />


<attr name="state_checkable" format="boolean"/>


<attr name="state_checked" format="boolean"/>


<attr name="state_selected" format="boolean" />


<attr name="state_pressed" format="boolean" />


<attr name="state_activated" format="boolean" />


<attr name="state_active" format="boolean" />


<attr name="state_single" format="boolean" />


<attr name="state_first" format="boolean" />


<attr name="state_middle" format="boolean" />


<attr name="state_last" format="boolean" />


<attr name="state_accelerated" format="boolean" />


<attr name="state_hovered" format="boolean" />


<attr name="state_drag_can_accept" format="boolean" />


<attr name="state_drag_hovered" format="boolean" />


<attr name="state_accessibility_focused" format="boolean" /></pre>
</div>
 
 
<h1>与ripple涟漪的配合使用</h1>
 
 
<div class="cnblogs_code">
<pre><?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
 <ripple android:color="@color/white" android:radius="1000dp">
 <item android:drawable="@mipmap/launcher_ic_news" />
 </ripple>
</item>
<item android:state_focused="true" android:drawable="@mipmap/launcher_ic_news"/>
<item android:drawable="@mipmap/launcher_ic_news" android:state_selected="true" />
<item android:drawable="@mipmap/launcher_ic_news"/>

</selector></pre>
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<h1>代码上实现StateListDrawable点击效果</h1>
<div class="cnblogs_code">
<pre> GradientDrawable drawableRed = new GradientDrawable();
 drawableRed.setShape(GradientDrawable.RECTANGLE);
 drawableRed.setColor(Color.RED);

 GradientDrawable drawableBlue = new GradientDrawable();
 drawableBlue.setShape(GradientDrawable.RECTANGLE);
 drawableBlue.setColor(Color.BLUE);

 int pressed =android.R.attr.state_pressed;
 StateListDrawable stateListDrawable = new StateListDrawable();
 stateListDrawable.addState(new int[]{pressed}, drawableRed);
 stateListDrawable.addState(new int[]{-pressed}, drawableBlue);
 btn1.setBackground(stateListDrawable);</pre>
</div>
 
效果图:
<img src="https://img2018.cnblogs.com/blog/1497956/201907/1497956-20190725140605575-1358115020.gif" alt="">
 

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本文来自博客园，作者：观心静，转载请注明原文链接：https://www.cnblogs.com/guanxinjing/p/11243902.html 
<div style="color:orange;font-size:16px;">本文版权归作者和博客园共有，欢迎转载，但必须给出原文链接，并保留此段声明，否则保留追究法律责任的权利。 </div>
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来源：https://www.cnblogs.com/guanxinjing/p/11243902.html

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Android开发 StateListDrawable（selector）详解